{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,9]],"date-time":"2026-11-09T12:29:30Z","timestamp":1794227370990,"version":"4.9.0"},"reference-count":30,"publisher":"SAGE Publications","issue":"9","license":[{"start":{"date-parts":[[2011,7,7]],"date-time":"2011-07-07T00:00:00Z","timestamp":1309996800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Am J Sports Med"],"published-print":{"date-parts":[[2011,9]]},"abstract":"<jats:p>Background: The prevalence of jumper\u2019s knee among nonelite athletes from different sports is unknown.<\/jats:p>\n                  <jats:p>Purpose: This study was undertaken to determine the prevalence of jumper\u2019s knee in nonelite athletes from different sports and to determine potential risk factors for jumper\u2019s knee.<\/jats:p>\n                  <jats:p>Design: Cohort study (prevalence); Level of evidence, 2.<\/jats:p>\n                  <jats:p>Methods: 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\u2013Patella) score.<\/jats:p>\n                  <jats:p>\n                    Results: The overall prevalence of current jumper\u2019s 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%]) (\u03c7\n                    <jats:sup>2<\/jats:sup>\n                    = 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\u2019s knee was 71.4 (SD, 13.8). Athletes with jumper\u2019s knee were significantly younger, taller, and heavier than those without jumper\u2019s knee.\n                  <\/jats:p>\n                  <jats:p>Conclusion: Prevalence of jumper\u2019s knee is high among nonelite athletes and varies between 14.4% and 2.5% for different sports. Jumper\u2019s 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.<\/jats:p>","DOI":"10.1177\/0363546511413370","type":"journal-article","created":{"date-parts":[[2011,7,8]],"date-time":"2011-07-08T11:17:26Z","timestamp":1310123846000},"page":"1984-1988","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":284,"title":["Prevalence of Jumper\u2019s Knee Among Nonelite Athletes From Different Sports"],"prefix":"10.1177","volume":"39","author":[{"given":"Johannes","family":"Zwerver","sequence":"first","affiliation":[{"name":"Center for Sports Medicine, University Center for Sport, Exercise and Health, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Steven W.","family":"Bredeweg","sequence":"additional","affiliation":[{"name":"Center for Sports Medicine, University Center for Sport, Exercise and Health, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Inge","family":"van den Akker-Scheek","sequence":"additional","affiliation":[{"name":"Center for Sports Medicine, University Center for Sport, Exercise and Health, University Medical Center Groningen, University of Groningen, Groningen, The 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