Article

Prevalence of Jumper's Knee Among Nonelite Athletes From Different Sports A Cross-Sectional Survey

Center for Sports Medicine, University Center for Sport, Exercise and Health,, University Medical Center Groningen, Groningen, The Netherlands.
The American Journal of Sports Medicine (Impact Factor: 4.7). 07/2011; 39(9):1984-8. DOI: 10.1177/0363546511413370
Source: PubMed

ABSTRACT The prevalence of jumper's knee among nonelite athletes from different sports is unknown.
This study was undertaken to determine the prevalence of jumper's knee in nonelite athletes from different sports and to determine potential risk factors for jumper's knee. Design: Cohort study (prevalence); Level of evidence, 2.
The authors interviewed 891 male and female nonelite athletes from 7 popular sports in The Netherlands: basketball, volleyball, handball, korfball, soccer, field hockey, and track and field. Using a specially developed questionnaire, information was obtained about individual characteristics (age, height, and weight), training background, previous and actual knee problems, and the VISA-P (Victorian Institute of Sport Assessment-Patella) score.
The overall prevalence of current jumper's knee was 8.5% (78 of 891 athletes), showing a significant difference between sports with different loading characteristics. Prevalence was highest among volleyball players (14.4%) and lowest among soccer players (2.5%); it was significantly higher among male athletes (51 of 502 [10.2%]) than female athletes (25 of 389 [6.4%]) (χ(2) = 3.91, P = .048). The mean duration of symptoms was 18.9 months (standard deviation [SD], 21.6; median value, 12.0; range, 2.0-59.8). The mean VISA-P score of the athletes with jumper's knee was 71.4 (SD, 13.8). Athletes with jumper's knee were significantly younger, taller, and heavier than those without jumper's knee.
Prevalence of jumper's knee is high among nonelite athletes and varies between 14.4% and 2.5% for different sports. Jumper's knee is almost twice as common among male nonelite athletes compared with female athletes. Different sport-specific loading characteristics of the knee extensor apparatus, a younger age, a taller body stature, and higher body weight seem to be risk factors associated with patellar tendinopathy.

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    • "Although between-sex discrepancy in patellar tendinopathy prevalence exists (Zwerver et al., 2011; Visnes et al., 2013), little is known about whether male and female volleyball players display different landing Fig. 2. Peak patellar tendon force (a) and patellar tendon force loading rate (b) (mean ± standard deviation) for all participants (n = 20 per group), when matched for jump height (n = 13 per group), and when matched for anthropometry (n = 9 per group). *Indicates a significant between-sex difference (P < 0.05). "
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    ABSTRACT: Patellar tendinopathy is the most common overuse knee injury in volleyball, with men reporting more than twice the injury prevalence than women. Although high patellar tendon loading is thought to be a causative factor of patellar tendinopathy, it is unknown whether between-sex variations in landing technique account for differences in patellar tendon loading. It was hypothesized that male volleyball players would display differences in landing technique and would generate higher patellar tendon loading than their female counterparts. The landing technique and patellar tendon loading of 20 male and 20 female volleyball players performing a lateral stop-jump block movement were collected. Independent t-tests were used to identify any between-sex differences in landing technique with the data grouped to account for differences in jump height and in anthropometry. Male volleyball players were taller and heavier, landed from a higher height, displayed differences in landing kinematics, generated a significantly greater knee extensor moment, and experienced higher patellar tendon loading than female players when all 40 participants were compared. However, when participants were matched on jump height, they generated similar patellar tendon loading, irrespective of their sex. These results imply that jump height is a more important determinant of patellar tendon loading than sex.
    Scandinavian Journal of Medicine and Science in Sports 01/2014; 25(2). DOI:10.1111/sms.12172 · 3.17 Impact Factor
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    • "Le basketball et le volleyball ainsi que la danse professionnelle sont très pourvoyeurs de cette pathologie et notamment les joueurs possédant une habileté importante à la détente verticale [17] [18] [19]. L'incidence chez le sportif peut atteindre 32 à 45 % sur le sportif d'élite respectivement au volleyball et basketball [6], elle est mesurée à 14 % sur 891 sportifs amateurs par Zwerver [20] et à 2,4 % chez le footballeur d'élite par Hägglund [21]. Dans une étude sur de jeunes basketteurs de haut niveau, la prévalence est retrouvée à 7 % entre 14 et 18 ans puis elle passe à 32 % entre 19 et 29 ans et 53 % des joueurs s'en sont plaints au moins une fois lorsqu'on les interroge en fin de carrière [22]. "
    Edited by Elsevier Masson, 11/2013; Mises au point sur les tendinopathies rotuliennes et calcanéennes.
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    • "These numbers are small and should be interpreted with caution, but still, this raises questions about early specialization in sports for these young athletes. Boys had three to four times higher risk for developing jumper's knee compared with girls, and this is somewhat higher compared with a previous cross-sectional study (Lian et al., 2005; van der Worp et al., 2011b; Zwerver et al., 2011). There is no evidence to explain why men have a greater risk, but possible explanations could be higher body mass, larger muscle mass, and an ability to jump higher, resulting in greater tendon load. "
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    ABSTRACT: Training volume and body composition have been suggested as risk factors for jumper's knee among athletic youth, but research is lacking. The aim of this 4-year prospective cohort study was to examine the relationship between training and competition load, body composition, and risk for developing jumper's knee. Participants are elite volleyball players, aged 16-18 years. Training and competition load was recorded continuously and body composition semiannually. Jumper's knee was diagnosed on a standardized clinical examination. We recruited 141 healthy students (69 males and 72 females), and 28 developed jumper's knee (22 boys and six girls). In a multivariate analyses, boys had three to four times higher risk compared with girls. Volleyball training had an odds ratio (OR) 1.72 (1.18-2.53) for every extra hour trained, and match exposure was the strongest sports-related predictor for developing jumper's knee with an OR of 3.88 (1.80-8.40) for every extra set played per week. We did not detect any significant differences between the groups in body composition at the time of inclusion or in the change of body composition during the study period. Conclusion, male gender, a high volume of volleyball training and match exposure were risk factors for developing jumper's knee.
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