{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,11]],"date-time":"2026-09-11T16:15:54Z","timestamp":1789143354659,"version":"build-2803163510"},"reference-count":55,"publisher":"SAGE Publications","issue":"3","license":[{"start":{"date-parts":[[2021,3,1]],"date-time":"2021-03-01T00:00:00Z","timestamp":1614556800000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Orthopaedic Journal of Sports Medicine"],"published-print":{"date-parts":[[2021,3,1]]},"abstract":"<jats:sec>\n                    <jats:title>Background:<\/jats:title>\n                    <jats:p>The association between injury risk and skeletal maturity in youth soccer has received little attention.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Purpose:<\/jats:title>\n                    <jats:p>To prospectively investigate injury patterns and incidence in relation to skeletal maturity in elite youth academy soccer players and to determine the injury risks associated with the skeletal maturity status, both overall and to the lower limb apophysis.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Study Design:<\/jats:title>\n                    <jats:p>Descriptive epidemiology study.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods:<\/jats:title>\n                    <jats:p>All injuries that required medical attention and led to time loss were recorded prospectively during 4 consecutive seasons in 283 unique soccer players from U-13 (12 years of age) to U-19 (18 years). The skeletal age (SA) was assessed in 454 player-seasons using the Fels method, and skeletal maturity status (SA minus chronological age) was classified as follows: late, SA &gt;1 year behind chronological age; normal, SA \u00b11 year of chronological age; early, SA &gt;1 year ahead of chronological age; and mature, SA = 18 years. An adjusted Cox regression model was used to analyze the injury risk.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results:<\/jats:title>\n                    <jats:p>A total of 1565 injuries were recorded; 60% were time-loss injuries, resulting in 17,772 days lost. Adjusted injury-free survival analysis showed a significantly greater hazard ratio (HR) for different status of skeletal maturity: early vs normal (HR = 1.26 [95% CI, 1.11-1.42]; P &lt; .001) and early vs mature (HR = 1.35 [95% CI, 1.17-1.56]; P &lt; .001). Players who were skeletally mature at the wrist had a substantially decreased risk of lower extremity apophyseal injuries (by 45%-61%) compared with late ( P &lt; .05), normal ( P &lt; .05), and early ( P &lt; .001) maturers.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion:<\/jats:title>\n                    <jats:p>Musculoskeletal injury patterns and injury risks varied depending on the players\u2019 skeletal maturity status. Early maturers had the greatest overall adjusted injury risk. Players who were already skeletally mature at the wrist had the lowest risk of lower extremity apophyseal injuries but were still vulnerable for hip and pelvis apophyseal injuries.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/2325967121999113","type":"journal-article","created":{"date-parts":[[2021,4,2]],"date-time":"2021-04-02T02:22:50Z","timestamp":1617330170000},"update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":39,"title":["Association of Skeletal Maturity and Injury Risk in Elite Youth Soccer Players: A 4-Season Prospective Study With Survival Analysis"],"prefix":"10.1177","volume":"9","author":[{"given":"Olivier","family":"Materne","sequence":"first","affiliation":[{"name":"ASPETAR, Orthopaedic and Sports Medicine Hospital, Doha, Qatar."},{"name":"Aspire Health Centre, Aspire Academy, Doha, Qatar."},{"name":"Rangers Football Club, Glasgow, Scotland."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karim","family":"Chamari","sequence":"additional","affiliation":[{"name":"ASPETAR, Orthopaedic and Sports Medicine Hospital, Doha, Qatar."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Abdulaziz","family":"Farooq","sequence":"additional","affiliation":[{"name":"ASPETAR, Orthopaedic and Sports Medicine Hospital, Doha, Qatar."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Adam","family":"Weir","sequence":"additional","affiliation":[{"name":"ASPETAR, Orthopaedic and Sports Medicine Hospital, Doha, Qatar."},{"name":"Sport Medicine and Exercise, Clinic Haarlem (SBK), Haarlem, the Netherlands."},{"name":"Department of Orthopaedics, Erasmus MC University Medical Centre, Rotterdam, the Netherlands."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Per","family":"H\u00f6lmich","sequence":"additional","affiliation":[{"name":"ASPETAR, Orthopaedic and Sports Medicine Hospital, Doha, Qatar."},{"name":"Sports Orthopaedic Research Center, Copenhagen (SORC-C), Copenhagen University Hospital, Amager-Hvidovre, Denmark."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Roald","family":"Bahr","sequence":"additional","affiliation":[{"name":"ASPETAR, Orthopaedic and Sports Medicine Hospital, Doha, Qatar."},{"name":"Department of Sports Medicine, Oslo Sports Trauma Research Center, Norwegian School of Sport Sciences, Oslo, Norway."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matt","family":"Greig","sequence":"additional","affiliation":[{"name":"Department of Sport and Physical Activity, Edge Hill University, Ormskirk, UK."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lars R.","family":"McNaughton","sequence":"additional","affiliation":[{"name":"Department of Sport and Physical Activity, Edge Hill University, Ormskirk, UK."},{"name":"Department of Sport and Movement Studies, Faculty of Health Science, 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