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Tóm tắt nội dung (trích từ tài liệu gốc): Downloaded from http://bjsm.bmj.com/ on July 30, 2015 - Published by group.bmj.com 415 REVIEW Tennis injuries: occurrence, aetiology, and prevention B M Pluim, J B Staal, G E Windler, N Jayanthi ............................................................................................................................... Br J Sports Med 2006;40:415�423. doi: 10.1136/bjsm.2005.023184 A systematic search of published reports was carried out in the duration and nature of treatment, time lost three electronic databases from 1966 on to identify from sports participation or work, permanent relevant

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                                                                                                                                                     415



   REVIEW



Tennis injuries: occurrence, aetiology, and prevention



B M Pluim, J B Staal, G E Windler, N Jayanthi



...............................................................................................................................



                           Br J Sports Med 2006;40:415�423. doi: 10.1136/bjsm.2005.023184



A systematic search of published reports was carried out in                     the duration and nature of treatment, time lost

three electronic databases from 1966 on to identify                             from sports participation or work, permanent

relevant articles relating to tennis injuries. There were 39                    disability, and cost.9 Another important step is to

case reports, 49 laboratory studies, 28 descriptive                             determine risk factors and other mechanisms

epidemiological studies, and three analytical                                   that are associated with these injuries.9 10 This

epidemiological studies. The principal findings of the                          aetiological research entails understanding the

review were: first, there is a great variation in the reported                  causes of injury, with the goal that modification

incidence of tennis injuries; second, most injuries occur in                    or removal of these causes can prevent the

the lower extremities, followed by the upper extremities                        occurrence of the injuries.10 The next step

and then the trunk; third, there have been very few                             consists of the formulation of preventive mea-

longitudinal cohort studies that investigated the association                   sures.10 These measures must be evaluated with

between risk factors and the occurrence of tennis injuries                      regard to their effectiveness before implementa-

(odds ratios, risk ratios, hazard ratios); and fourth, there                    tion. Ideally, evaluation should include rando-

were no randomised controlled trials investigating injury                       mised controlled trials.10�12

prevention measures in tennis. More methodologically

sound studies are needed for a better understanding of risk                        Our aim in this review of published reports

factors, in order to design useful strategies to prevent tennis                 was to provide an overview of the available

injuries.                                                                       scientific knowledge on the occurrence, aetiol-

                                                                                ogy, and possibilities for prevention of tennis

...........................................................................     injuries. We asked the following three questions.

                                                                                First, what are the most common tennis injuries,

See end of article for     T ennis is a global sport, with participation in     based upon the reported prevalence and inci-

authors' affiliations           more than 200 countries affiliated with the     dence figures? Second, what associated risk

.......................         International Tennis Federation.1 It is also a  factors and mechanisms are described with

                           professional sport in which millions of dollars in   regard to the aetiology of tennis injuries? And

Correspondence to:         prize money are at stake for both men and            third, what is known about the efficacy of

Dr Babette M Pluim, Royal  women players. In the Netherlands, it is the         prevention efforts designed to reduce the occur-

Netherlands Lawn Tennis    second most popular sport, with more than one        rence of tennis injuries?

Association, PO Box 1617,  million participants from a population of 16

3800 BP Amersfoort,        million.2 Among Dutch women it is actually the          Another purpose of this review was to identify

Netherlands; bpluim@       most popular sport.3 In other European countries     gaps in knowledge with respect to the occur-

euronet.nl                 tennis also ranks high on the list of popular        rence, aetiology, and prevention of tennis inju-

                           sports.3                                             ries and to encourage further methodologically

Accepted 22 January 2006                                                        sound epidemiological research in this field.

.......................       Like many other sports, playing tennis--at

                           either a recreational, collegiate, or professional   METHODS

                           level--places participants at risk of injury.        We undertook a literature search to retrieve

                           Though many injuries that occur in tennis are        potentially relevant articles published since 1966.

                           common to other sports, tennis does have a           The following electronic databases were

                           unique profile of injuries.4 Differences in equip-   explored: Pubmed (from 1966 to October 2005),

                           ment, biomechanics, and physical demands             Embase (from 1989 to October 2005), and

                           result in an injury profile that differs from other  Cumulative Index to Nursing and Allied Health

                           racquets and throwing sports.4 Sports injuries,      Literature (CINAHL) (from 1982 to October

                           including tennis injuries, are a common cause of     2005). A priori defined search terms (Medical

                           disability and, in some cases, absence from          subject heading (Mesh) and text words) that

                           work.5�7 This can have substantial socioeconomic     were used in this search were: ``injury'', ``inju-

                           consequences, both on a personal and a societal      ries'', ``prevalence'', ``incidence'', ``incidence

                           level.8 For these reasons it is important to         density'', ``proportion'', ``distribution'', ``popula-

                           develop effective measures for the prevention of     tion'', ``aetiology'', ``etiology'', ``mechanism'',

                           tennis injuries.                                     ``risk factor'', ``risk factors'', ``prevention'' and

                                                                                ``intervention''. These terms were combined with

                              To develop prevention strategies, both the        ``tennis''. Reading titles and abstracts identified

                           incidence and severity of tennis injuries must       potentially relevant articles. Citation tracking of

                           be determined. The severity of an injury can be      the articles retrieved was also performed to

                           described on the basis of the nature of the injury,  identify additional relevant articles.



                                                                                   To be included in this review studies had to

                                                                                meet the following inclusion criteria: they must

                                                                                contain data on tennis injuries; they must

                                                                                investigate the frequency of tennis injuries, the

                                                                                aetiology (for example, risk factors) of tennis

                                                                                injuries, the efficacy of prevention strategies, or a



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416                                                                                              Pluim, Staal, Windler, et al



combination of these purposes; and they must have been                  Vascular injury in the upper extremity was mentioned four

published in English, German, or Dutch. Studies focusing on          times.32�35 Though an uncommon injury, it has also been

treatment for tennis injuries and literature reviews were            reported in overhead batting and racquet sports. Vascular

excluded. For the purpose of this review we defined a tennis         injury may result from compression of the large vessels in the

injury as a musculoskeletal problem requiring reduction or           axilla during the service motion, resulting in aneurysm

interruption of tennis activity for any length of time, with or      formation.35 Distal embolisation may occur.34 Endothelial

without evaluation or treatment by a health care provider.13         injury caused by repeated microtrauma to the hand by the

                                                                     racket was also reported.32 33

   We did not expect to find many cohort or randomised

controlled studies in this field. Furthermore, with the                 Regarding the lower extremity, injuries were more equally

expected heterogeneity in study designs and methods, we              distributed and included case reports on tendon injuries,46 48

elected not to follow a formal meta-analytic approach. The           plantar fascia tears,49 52 muscles tears,45 stress fractures,47 50

studies retrieved were classified as case reports, laboratory        and intra-articular knee injury.51

studies, descriptive epidemiological studies, analytic epide-

miological studies, or intervention/prevention trials. A similar     Laboratory studies

approach was conducted earlier by Pollack et al14 15 with            Forty nine laboratory studies were identified: 36 involved the

regard to the available evidence for the prevention of softball      upper extremity,55�90 six the lower extremity,91�96 three the

injuries. For reasons of clarity we defined descriptive              trunk,97�99 and four the whole body.100�103 In the upper

epidemiological studies a priori as cohort studies (either           extremity articles, the following topics were discussed most

cross sectional or longitudinal), describing the frequency           often: range of motion (seven studies)55 58 61�65 and strength

(that is, prevalence or incidence or both) of tennis injuries in     (nine studies)55�60 62 65 66 of the shoulder, and biomechanical

a cohort or subcohort. Analytic epidemiological studies were         analysis of the stroke (six studies).69�71 74 75 77

defined as cohort studies (either cross sectional or long-

itudinal) which aimed to estimate a measure of association              In the studies examining range of motion of the shoulder,

(that is, odds ratio, risk ratio, hazard ratio) between risk         internal and external rotation was measured using a

factors and the occurrence of tennis injuries. The results of        goniometer. In six58 61�65 of seven studies55 58 , 61�65 a significant

the selected studies will be described and summarised to             decrease of internal rotation and total range of motion was

formulate answers to the research questions posed above. The         demonstrated in the dominant arm. Kibler et al64 showed that

emphasis lies on the results of descriptive and analytic             the loss of total range of motion was progressive with age and

epidemiological studies, and intervention/prevention studies         years of tournament play.

rather than laboratory studies or case series and reports.

                                                                        Muscular strength of the shoulder was determined by

RESULTS                                                              isokinetic testing. Five58�60 62 65 of seven studies55 56 58�60 62 65

Our search in the Pubmed, Embase, and Cinahl databases               showed an imbalance of muscle strength, with significantly

resulted in, respectively, 1368, 1617, and 2460 potentially          greater isokinetic strength in the dominant arm than in the

relevant hits. To identify appropriate papers for the present        non-dominant arm for internal rotation, leading to a reduced

review, the titles and abstracts were read and, if considered        external/internal rotation ratio. Both the loss of internal

relevant, selected by two persons (BMP and JBS). In cases of         rotation motion and the muscle strength imbalance were

disagreement further discussion was undertaken to achieve            hypothesised to increase the risk of shoulder injuries.

consensus. We found 39 case reports, 49 laboratory studies,

28 descriptive epidemiological studies, three analytic epide-           In three91 95 96 of the six articles91�96 focusing on the lower

miological studies, and no intervention study which met the          extremity, the interaction between shoe and court surface

inclusion criteria of the present review. Table 1 provides an        was examined. The main conclusion of these studies was that

overview of the distribution of study type and body region           lateral stability of the shoe is important in the prevention of

within the relevant articles.                                        injuries.



Case reports                                                         Descriptive epidemiological studies

Of the 39 case reports, 29 dealt with injuries of the upper          Twenty eight descriptive epidemiological studies were identi-

extremity,16�44 eight with injuries of the lower extremity,45�52     fied, including 19 on tennis injuries in general,104�124 seven on

and two with the trunk.53 54 Of the case reports, the most           injuries of the upper extremity,125�132 one on the lower

common condition in the upper extremity injury section was           extremity,133 and one on the trunk.134

stress fractures (14 case reports).16�29 Stress fractures in the

upper extremity included the metacarpals, hamate bone,               Injury incidence

radius, ulna, and humerus. The suggested causal mechanism            Injury incidence varied from 0.05122�124 to 2.9119 injuries per

involved repeated loading on the upper extremity during the          player per year (table 2). Per hour of play, the reported

tennis stroke,27 28 and included the impact of the racket butt       incidence varied from 0.04 injuries/1000 hours108 to 3.0

against the palm of the hand,16�18 and high torsional                injuries/1000 hours.105 Incidence and prevalence rates for

stresses.25 27 28                                                    tennis elbow were quite high, with reported incidence

                                                                     varying from 9%128 to 35%130 and prevalence varying from

                                                                     14%128 to 41%.131 132



                    Table 1 Distribution of identified studies by type of study and body region



                                                               Descriptive  Analytical          Intervention and

                                                                                                prevention

                                     Case studies  Laboratory  epidemiological epidemiological

                                                                                                0

                    General           0             4          19           1                   0

                    Upper extremity  29            36                                           0

                    Lower extremity                               7         0                   0

                    Trunk             8             6                                           0

                    Total             2             3             1         1

                                     39            49

                                                                  1         1



                                                               28           3



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                    Table 2 Characteristics and results of included descriptive epidemiological studies                                                                                                                                   Tennis injuries



                    Study*            Study design                     Study population                     Injury definition                  General incidence       Upper Lower      Trunk/ Type of injury   Severity

                    Vriend104                                                                                                                                          ext (%) ext (%)  head (%) reported

                    Jayanthi105       Cross sectional study:           General population: in               All acute and chronic injuries     1.1/1000 h: O/D                                                  52% required medical

                    Ku�hne106         telephone interviews, with       each of the 5 y, 10 000 people       or ailments that developed as a    0.9/1000 h; I/D         29.1 53.6        10.2 (not NR            treatment (O/D 49%, I/

                    Da Silva107       recall period of 3 m             were interviewed, of whom            result of or during sports         1.6/1000 h                               defined                 D 59%, NS)

                    LIS 1999�2003108  (2000�2004)                      ,50% were sports participants        participation in the past 3 m                                               3.7)

                    Schmikli109

                                      Cross sectional, questionnaire;  140 M, 388 F recreational            Any injury or pain the player      3.0 inj/1000 h;         41  49           3   Overuse injuries    NR                                         Downloaded from http://bjsm.bmj.com/ on July 30, 2015 - Published by group.bmj.com

                    Sallis110         recall period 1 y                league players (International        had experienced in the past        prevalence 52.9

                    Steinbru�ck111                                     Tennis Number 3 to 8); mean          12 m preventing play for >7 d      inj/100 players                              predominated, most

                    Weijermans112                                      age 46.9 y

                                                                                                                                                                                            in upper extremity



                                      Prospective study, follow up     60 competitive, 50 recreational      The injuries and problems that     1.5 inj/player/y        25  64           11  Cramps, strains,    3.3% of acute and 2.2%

                                      6 months                         players; C range 16�35 y,            the player experienced during

                                                                       mean 25; R range 40�68 y,            the tennis season                                                               and sprains were    of chronic injuries were

                                                                       mean 53

                                                                                                                                                                                            most common         eventually operated



                                      Prospective study with 1 y       Elite junior players, participating  Any consultation and/or            6.9 medical treatment/  NR  NR           NR  Cramps (muscle      NR

                                      follow up; all medical           in the national circuit in Brazil    treatment given to a player        1000 games played

                                      treatments required during       in the ,12, ,14, ,16,                during a tournament on site                                                     contracture) were

                                      tournament                       and ,18 age categories                                                  0.04 inj/1000 h

                                      Prospective study of injuries    General population; 7700             Injuries requiring treatment at                                                 most common

                                      treated at the first aid         tennis players                       the first aid department of the

                                      department of 15 selected                                             hospital                                                   28  59           13  Acute, more severe Costs per injury J830;

                                      hospitals in Netherlands

                                                                                                                                                                                            type of injuries;   5% hospitalised for an



                                                                                                                                                                                            sprains most        average of 5 d



                                                                                                                                                                                            common (59%)



                                      Cross sectional study:           General population, 1982�83;         Injuries or ailments newly         1986�87: I/D 1.8/       NR  NR           NR  NR                  Medical treatment

                                      telephone interviews; recall     67 139 persons, of whom              developed as a result of or        1000 h; O/D 1.2/                                                 required: O/D, 27%,

                                      periods 1 month (1986�87),       31 688 played sports                 during sports participation in     1000 h; 1992�93:                                                 34%, and 39% of

                                      1 month (1992�93), and                                                the past 4 wk (3 m); chronic       I/D 2.9/1000 h;                                                  injuries; I/D, 57%, 60%,

                                      3 months (1997�98)                                                    injuries not recorded              O/D 1.2/1000 h;                                                  and 66%

                                                                                                                                               1997�98: I/D 1.0/

                                                                                                                                               1000 h; O/D 0.5/

                                                                                                                                               1000 h



                                      Retrospective cohort study of    College players; range 18�22 y; Medical problem as a result             0.456 M; 0.425 F        23.1 M; 62.2 M; 14.6 M; NR               No ACL injuries,

                                      injury reports compiled by                                                                               per player/y            21.9 F 70.7 F 7.2 F                      otherwise NR

                                      athletic trainers with a 15 y    3767 participants, divided over of sport participation requiring

                                      follow up period

                                                                       sports, including tennis             visit to training room



                                      Prospective longitudinal study General population; 1257 M             Not defined: any medical           NR                      21  60           19  Knee 25%;           NR



                                      with 25 y follow up; visits to and 858 F tennis players               problem that required a visit                                                   ankle 23%



                                      sports orthopaedic and                                                to the sports medicine clinic



                                      trauma OPD                                                            was registered as an injury



www.bjsportmed.com                    Prospective cohort study of      179 club players                     Tennis related problem resulting   0.11/1000 h             NR  67           NR  Mostly acute        For the 5 most common

                                      46 tennis clubs; follow up                                            in loss of practice or match

                                      6 months (O/D tennis                                                  time, need for medical                                                          injuries; tennis leg injuries, 60% needed

                                      season); injuries reported                                            consultation, or negative social/

                                      to contact person                                                     economic consequences                                                           and sprained ankle medical consultation,

                                                                                                            (absence from school/work)

                                                                                                                                                                                            most common         and 20% absence from



                                                                                                                                                                                                                school/work



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                    Table 2 (Continued)



                    Study*               Study design                Study population                Injury definition                General incidence      Upper Lower      Trunk/ Type of injury      Severity

                    Hutchinson113        Prospective cohort          1440 male participants                                                                  ext (%) ext (%)  head (%) reported

                                         study, with follow          at the USTA National            Any medical problem requiring    21.5/1000 athletic                                                 One athlete transported

                    Baxter-Jones114      up of 6 y                   Boys Championships              physical or medical assistance   exposures; 9.9/100     26  51           22    Sprains 58%          to hospital for heat

                    Lanese115                                        1986�1988; 1990�1992                                             players                                                            exhaustion

                                         Prospective                 156 elite players in five 2-y

                                         cohort study                age groups from 8�16 y          Any injury resulting in          0.52 inj/player/y      NR  NR           NR    Osteochondrosis      Acute injuries 13 d lay-                                                            Downloaded from http://bjsm.bmj.com/ on July 30, 2015 - Published by group.bmj.com

                                                                                                     discontinuation of training                                              NR    26%                  off time; chronic injuries

                                         Prospective cohort          12 M, 11 F college players,     and/or medical treatment         1.6 inj/1000 h (M);    NR  NR           11                         20 d

                                         study                       18�22 y                                                          1.0 inj/1000 h (F),                     19.3  NR

                                                                                                     Traumatic medical problem        p = 0.37                                                           2.42 (0.57) disability d

                                                                     Elite players: 61 M, mean       due to sports participation                                                                         per 100 person h

                                                                     age 28 y; 28 F, mean            resulting in time loss from

                    Winge116             Prospective study,          age 22 y                        practice or competition          0.52 inj/player/season; 45.7 39               Shoulder injuries    Mean injury period

                                         follow up 6 months                                                                           2.3 inj/1000 h (M 2.7,                        17%                  44.5 d; absence from

                                         (O/D tennis season)         78 M + 49 elite players,        Every problem that appeared      F 1.1)                                                             work practically 0

                                                                     age range 15�46 y               in connection with tennis,

                    Krause117            Cross sectional             78 M + 53 recreational          handicapped the player           0.7 inj/player/y       36.4 44.3              Shoulder, back,      NR

                    Chard118                                         players, age range 8�66 y       during play, and/or required

                                         Longitudinal study,                                         special treatment

                                         8 y follow up; visits to    24 M + 21 F elite players at

                                         sports medicine clinic      Australian Institute of Sport,  NR

                                                                     aged 16�20 y, mean 17.6

                                                                                                                                                                                    and ankle 85%

                                                                     15 elite M players, 1�15 in

                                                                     German National ranking;        Medical problem related to       NR                     35  45           20    PF problems 44%; NR

                                                                     mean age 28 y; range 15�43                                                                                     acute injuries 70%,

                                                                                                     tennis that required a visit to                                                chronic injuries 30%

                                                                     100 M and 26 F recreational

                                                                     players, mean age 43 y          the sports injury clinic (self



                                                                     203 M, 72 F high level          referral for acute injuries;

                                                                     competitive players; mean

                                                                     age 28 y                        referral by GP for chronic



                                                                                                     injuries)



                    Reece119             Retrospective cohort                                        Any injury that required         2.5 inj player/y (M);  20  59           21    Ankle sprain most    2 conditions required

                                         study: injuries requiring                                                                                                                  common, followed by  surgical intervention

                                         attention of medical                                        attention from the medical       2.9 inj/player/y (F)                          calf and quadriceps

                                         officer or physiotherapist                                                                                                                 strain

                                                                                                     officer or physiotherapist



                    Von Salis-Soglio120  Cross sectional study:                                      NR                               NR                     NR  NR           NR    Shoulder and elbow   Small risk for long term

                                         interview and medical                                                                                                                      problems (tennis     problems

                                         examination                                                                                                                                elbow) most

                                                                                                                                                                                    common



                    Von Kra�mer121       Retrospective study,                                        Complaints and diseases          NR                     47.5 31.1        16.6  Tennis elbow 39%; NR                                                       Pluim, Staal, Windler, et al

                                         follow up 17.5 y                                            which resulted from              0.05 inj/player/y                             Achilles tendon

                                                                                                     playing tennis                                                                 15%)



                    Biener122�124        Cross sectional                                             NR                                                      48.6 43.4% 2/6         Tennis elbow 36%; NR

                                                                                                                                                                                    sprains 21%; strains

                                                                                                                                                                                    14%



                    *First author and reference number.

                    ACL, anterior cruciate ligament; ; d, days; ext, extremity; F, female; I/D, indoor; inj, injury; h, hours; m, months; M, male; NR, not reported; O/D, outdoor; OPD, outpatient department; PF, patellofemoral joint; wk, weeks; y, years.

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Tennis injuries                                                                                                                                        419



Table 3 Characteristics and results of included analytic epidemiological studies



Study*           Study design  Study population             Risk factors                Outcomes           Adjustment for

Llana137                                                                                Discomfort         confounders Results

                 Cross         A sample of 146 tennis       Perceived design

                 sectional     players in Spain selected    errors                                         No   Significant correlation (p = 0.02)

                 study         from a sample of 4000

                               who had completed a                                                              between incorrect arch support

                               questionnaire on

                               ``discomfort'' associated                                                        and plantar discomfort

                               with tennis shoes

Spector135 Retrospective                                    Long term weight            Pain               Yes  The ex-athletes had greater rates

                 cohort study  81 female ex-elite athletes  bearing sports              OA as defined

                               (67 middle and long          activity                    by radiological         of radiological OA at all sites. This

                               distance runners, and 14                                 changes (joint

                               tennis players), aged                                    space narrowing         association was strongest for the

                               40�65, recruited from                                    and osteophytes)

                               original playing records,                                in hip joints, PF       presence of osteophytes at the TF

                               and 977 age matched                                      joints, and TF

                               female controls from                                     joints                  joints (OR = 3.57 (95% CI, 1.89

                               London UK

                                                                                                                to 6.71)), at the PF joints



                                                                                                                (OR = 3.50 (1.80 to 6.81)),



                                                                                                                narrowing at the PF joints



                                                                                                                (OR = 2.97 (1.15 to 7.67)), femoral



                                                                                                                osteophytes (OR = 2.52



                                                                                                                (1.01 to 6.26)), and hip joint



                                                                                                                narrowing (OR = 1.60 (0.73 to



                                                                                                                3.48)), and was weakest for



                                                                                                                narrowing at



                                                                                                                the TF joints (OR = 1.17 (0.71



                                                                                                                to 1.94)). The tennis players



                                                                                                                tended to have more osteophytes



                                                                                                                at the TF joints and hip



Nigg136          Prospective   171 members of               Shoe, temperature, Pain                        No   Stiffness of shoe and subjective

                 cohort study  tennis clubs                 type and duration

                 (2 m follow                                of match play,                                      evaluation of frictional properties

                 up)                                        subjective

                                                            assessment of shoe                                  of the shoe were significantly

                                                            comfort, sole grip

                                                            and lateral stability                               associated with pain



Only statistically significant results are reported.

*First author and reference number.

CI, confidence interval; m, months; OA, osteoarthritis; OR, odds ratio; PF, patellofemoral; TF, tibiofemoral.



Injury localisation                                                                     players. This was not a statistically significant difference

                                                                                        (p = 0.37).

Ten of 13 studies 104�106 108 110�113 117 119  104�106 108 110�113 116 117 119 121�124

                                                                                           Sallis et al110 studied injury patterns in 18�22 year old

showed a preponderance of injuries of the lower extremity                               tennis players. This was a retrospective cohort study of injury

                                                                                        reports compiled by certified athletic trainers. The incidence

compared with the upper extremity.                                                      was 0.46 injuries per male player per year and 0.42 injuries

                                                                                        per female player per year. The differences was not

Injury type                                                                             statistically significant.

Four108 112 113 118 of six studies105 108 112 113 116 118 reported more

acute than chronic injuries. Most acute injuries occurred in                               Hutchinson et al113 compared injury patterns in elite junior

the lower extremities, whereas most chronic injuries were                               players (male and female) during a three year period (1996�

located in the upper extremities. Injuries to the trunk                                 1998) at the United States Tennis Association (USTA) tennis

comprised 5% to 25% of all injuries.104�106 108 110 111 113 116�119 121�124             championships. There was no significant difference in the

                                                                                        overall rate of injury (new and recurrent) between male and

Injury severity                                                                         female players.

Injury severity was expressed in various ways in the different

studies, including number of injuries requiring hospital                                   Winge et al116 found a higher injury rate in men (2.7 injuries

admission108 113 or operative treatment,106 average medical                             per 1000 hours) than in women (1.1 injuries per

costs per injury,108 time loss,114 115 or the percentage requiring                      1000 hours). This was a statistically significant difference

medical treatment.104 109 112 Injuries sustained while playing                          (p,0.05).

indoors tended to be more severe than outdoor injuries, with

a higher percentage requiring medical treatment.104 109 In the                          Age

study by Kuhne et al, 3.3% of acute and 2.2% of chronic                                 The Letsel Informatie Systeem108 is a continuous registration

injuries required surgery.106 Five per cent of the injuries in the                      of injuries treated in the emergency departments of a

Letsel Informatie Systeem (LIS) study required an average of                            selection of 15 hospitals and medical centres in the

five days of hospital admission.108 In the studies on juniors,                          Netherlands. These injuries are generally acute and more

injury severity was significantly less, with only one player of                         serious. In this study, injury risk in tennis has been shown to

1440 being taken to hospital and two injuries of 176 requiring                          gradually increase with age, from 0.01 injuries per player per

surgery.113                                                                             year in the 6�12 year age group to 0.5 injuries per player per

                                                                                        year in those over 75 years of age. An increased incidence

Sex                                                                                     with age was consistently shown for tennis elbow.127�132

Injury rates between men and women were compared in a

prospective cohort study of intercollegiate tennis.115 In this                          Level of play

study, 1.6 injuries per 1000 hours were recorded for male                               In these general descriptive epidemiological studies, the

tennis players versus 1.0 injury per 1000 hours in female                               study populations can be characterised as recreational/



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420                                                                    Pluim, Staal, Windler, et al



general, elite, or junior competitive. The studies include a           more acute and serious injuries will be reported, as players with

wide distribution of retrospective, cross sectional, pro-              less serious and chronic injuries are more likely to visit their

spective cohort, and prospective longitudinal study designs.           general practitioner, physiotherapist, or sports physician. The

There were nine studies104�106 108 109 111 112 118 121 involving       other study with a relatively low injury rate (0.11/1000 hours of

recreational players or the general population, seven                  play) was by Weijermans et al.112 In that study, injuries sustained

studies110 115�117 119 120 122�124 involving elite players, and three  by tennis players at a club had to be reported to a contact person

studies107 113 114 relating to junior tournament players. Study        in order to be recorded. This may have resulted in under-

designs of junior and elite players often involved recording of        reporting of injuries. Biener et al122�124 also reported a very low

injuries as medical consultations at tournaments or training           injury rate, which can be explained by their long recall period of

centres. This method of injury reporting may inflate injury            17.5 years.

rates, therefore making it difficult to make direct compar-

isons with studies involving recreational players that often              The highest injury rates were found by Hutchinson et al113

involve self reporting of their injuries.                              and Silva et al.107 This is undoubtedly related to their rather

                                                                       inclusive injury definitions: ``any medical problem that

   We were able to identify only two studies that compared             required physical or medical assistance''113 and ``any con-

injury rates between players of different ability. Baxter-Jones        sultation and/or treatment given to a player during a

et al114 studied elite young athletes. They found that                 tournament on site'',107 respectively. Using these definitions,

performance success was significantly related to injury rate.          injuries which may not have had any effect on tennis play,

Jayanthi et al105 described the incidence and prevalence of            time loss, or work were also included. Kuhne et al addressed

injuries in recreational players of different skill levels,            this problem by making a separate category for

ranging from International Tennis Number 3 to 8. Despite               ``Bagatellverletzungen'' (minor injuries), which included

trends, there were no statistical differences in overall injury        sunburns, abrasions, and blisters. We were not able to find

incidence and prevalence rates across all skill levels.                any study that identified the relation of match volume within

                                                                       a tournament or through a season and the risk of injury.

Volume of play                                                         Prospective studies of independent risks associated with

Studies describing the risks associated with volume of play            increased playing time in junior tournament players are

are scarce. Increased playing time was associated with                 lacking and necessary in order to counsel parents, coaches,

increased incidence of new cases of tennis elbow in                    and tournament directors with appropriate evidence based

recreational players playing more than two hours a day                 recommendations.

versus those playing less than two hours a day.128 However,

total incidence and prevalence of all tennis related injuries             Despite the wide variation of reported injury rates and

was not different among recreational players who played less           study designs, comparisons of injury rates in tennis can be

than four hours a week, four to six hours a week, or more              made with the rates in other sports. In order to make optimal

than six hours a week.105                                              comparisons, similar study designs and injury definitions

                                                                       should be used. There were 377 injuries in 456 matches

Analytic epidemiological, and intervention studies                     involving all team sports studied during the 2004 summer

Three studies were found that investigated risk factors for            Olympic Games.138 There was a total injury incidence of 0.8

tennis injuries (table 3). Two of these135 136 had a longitudinal      injuries per match and 54 injuries per 1000 player matches,

study design and one137 was cross sectional. Adjustments for           where injury was defined as any physical complaint incurred

confounding variables was made in one longitudinal cohort              during the match that received medical attention regardless

study.135 The type of sports injury described in the investi-          of consequence. Handball players (114/1000 player matches)

gated studies was variable and consisted of discomfort or              and soccer players (108/1000 player matches) had the highest

pain from wearing tennis shoes, sport related injuries in              injury rates, while volleyball players (7.7/1000 player

general, low back pain, and osteoarthritis.                            matches) had the lowest. With a similar definition of injury

                                                                       and comparable study design, Hutchinson et al113 reported

   Llana et al137 described in a cross sectional study a               21.5 injuries/1000 athletic exposures and Silva et al107 reported

significant correlation (p = 0.02) between perceived incorrect         6.9 medical appointments/1000 games in prospective studies

arch support and plantar discomfort. Spector et al135 found            of junior national tournament tennis players.

that long term weight bearing sports activity was associated

with the development of osteoarthritis.                                   It may be more appropriate to compare tennis with other

                                                                       individual non-contact sports rather than contact team

   No intervention study was retrieved investigating the               sports. A retrospective cohort survey study in golfers reported

effects of prevention measures on tennis injuries.                     3.06 injuries/player injured in professional players of average

                                                                       age 36.5 years, and 2.07 injuries/player injured in amateur

DISCUSSION                                                             players of average age 47.2 years.139 This study did not report

The principal findings of our study are first, that there is a         the total prevalence of injuries/100 players but had a total of

great variation in the reported incidence rate of tennis               637 injuries in 703 golfers surveyed. In a cross sectional

injuries; second, that most injuries occur in the lower                survey of recreational tennis players with an average age of

extremities, followed by the upper extremities and then the            46.9 years, there were 299 injuries in 528 players giving a

trunk; third, that there are very few cohort studies available         prevalence of 52.9 injuries/100 players.105 In a cross sectional

that estimate a measure of association between risk factors            survey study of recreational runners, 45.8% of 4358 male

and occurrence of tennis injuries; and fourth, that there are          joggers sustained jogging injuries in the previous one year

no randomised controlled trials on preventative measures in            period.140 A prospective study of recreational runners training

tennis.                                                                for a 10 km race reported that 29.5% of runners experienced

                                                                       an injury that caused at least some pain after exercise.141

   The variation in the reported incidence rates of tennis             Comparable prospective studies of recreational tennis players

injuries most probably reflects variation in injury definition,        over a six month period reported injury rates of 0.11/

study design, populations under study, methods of data                 1000 hours played112 and 1.5 injuries/player/year.106

collection, and the duration of follow up or recall period. The

lowest incidence rate (0.04 injuries per 1000 players per year)           Despite some variation in study design and definition of

was reported in the LIS study.108 Injuries in this study               injury, tennis appears to have lower injury rates than contact

included only those for which the player was treated at a              team sports and also in some comparisons with non-contact

hospital casualty department. This implies that predominantly          individual sports such as golf and running. However, no



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Tennis injuries                                                                                      421



known study has made direct comparisons between risks of             What is already known on this topic

injury or lifetime prevalence of injury between tennis and

other sports.                                                         There is a great variation in the reported incidence rate of

                                                                      tennis injuries. Most injuries occur in the lower extremities,

   Unfortunately, we were not able to identify any interven-          followed by the upper extremities and the trunk. Most acute

tion studies on tennis injuries. An intervention study by             injuries occur in the lower extremities, whereas most chronic

Kibler et al,142 in which 51 tennis players undertook a specific      injuries are located in the upper extremities.

programme of stretching exercises showed that the exercises

improved the range of motion. Although they did not record           What this study adds

the rate of injury, the authors hypothesised that this

stretching programme would reduce injury risk. There is               By presenting studies with different study designs, a picture

currently no evidence that limited flexibility is associated          emerges that represents the current base of knowledge in this

with an increased risk for tennis injuries. In a systematic           field. It is clear from the results that further studies on injury

review of intervention studies on the effect of stretching,           rates, risk factors, and prevention of tennis injuries are

Herbert and Gabriel143 showed that stretching before exercise         needed. A possible standard protocol for future studies is

did not result in a reduction of injury risk. However, they           presented.

noted that generalisation of this conclusion required further

testing. It therefore may be worthwhile to investigate the          musculoskeletal screening of players to identify problem

effects of the type of programme designed by Kibler et al142 on     areas before injuries occur, and adjustment of equipment

the occurrence of tennis injuries.                                  including shoes, racquets, strings, and balls as well as court

                                                                    surfaces. However, further research is needed to move from a

   The aim of the present literature review was to provide an       stage of clinical expertise and speculation to real evidence

overview of available knowledge on the occurrence, aetiology,       based prevention of tennis injuries.

and prevention of tennis injuries. For practical reasons we

refrained from doing a formal methodological quality                .....................

assessment of individual studies or a quantitative data

synthesis. However, by presenting studies with different            Authors' affiliations

study designs, a picture emerges that represents the current

base of knowledge in this field. It is clear from the results       B M Pluim, KNLTB, Amersfoort, Netherlands

that further studies on injury rates, risk factors, and             J B Staal, Department of Epidemiology, Maastricht University,

prevention of tennis injuries are needed. Researchers should,       Maastricht, Netherlands

if possible, choose a prospective study design in order to          G E Windler, ATP, Ponte Vedra Beach, Florida, USA

decrease the risk of recall bias.                                   N Jayanthi, Loyola University Medical Center, Chicago, Illinois, USA



   A comparison of injury rates across studies will be              Competing interests: none declared

facilitated when similar definitions of injuries are used and

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             Tennis injuries: occurrence, aetiology, and

             prevention



                B M Pluim, J B Staal, G E Windler and N Jayanthi

                Br J Sports Med 2006 40: 415-423



              doi: 10.1136/bjsm.2005.023184



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