{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,21]],"date-time":"2026-07-21T01:12:32Z","timestamp":1784596352815,"version":"3.55.0"},"reference-count":48,"publisher":"Wiley","issue":"9","license":[{"start":{"date-parts":[[2018,5,16]],"date-time":"2018-05-16T00:00:00Z","timestamp":1526428800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"name":"The Scientific Council of City of Tampere (Tampereen kaupungin tiederahasto)"},{"name":"The Finnish Ministry of Education and Culture"},{"name":"The Foundation of Sports Institute (Urheiluopistos\u00e4\u00e4ti\u00f6)"},{"name":"The Expert Responsibility Area of Tampere University Hospital","award":["9S049, 9U044"],"award-info":[{"award-number":["9S049, 9U044"]}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Scandinavian Med Sci Sports"],"published-print":{"date-parts":[[2018,9]]},"abstract":"<jats:p>This prospective study in youth football examined the relationship between frontal plane knee projection angle (<jats:styled-content style=\"fixed-case\">FPKPA<\/jats:styled-content>) during the single\u2010leg squat and sustaining an acute lower extremity injury or acute non\u2010contact lower extremity injury. Secondly, side\u2010to\u2010side asymmetry in <jats:styled-content style=\"fixed-case\">FPKPA<\/jats:styled-content> and sex as injury risk factors were explored. In addition, we investigated the influence of age, sex, and leg dominance on the <jats:styled-content style=\"fixed-case\">FPKPA<\/jats:styled-content>. A total of 558 youth football players (U11 to U14) participated in the single\u2010leg squat test and prospective injury registration. <jats:styled-content style=\"fixed-case\">FPKPA<\/jats:styled-content> was not found as a risk factor for injuries at this age. There was no difference in the mean <jats:styled-content style=\"fixed-case\">FPKPA<\/jats:styled-content> between sexes. However, <jats:styled-content style=\"fixed-case\">FPKPA<\/jats:styled-content> was associated with age; oldest subjects displayed the smallest <jats:styled-content style=\"fixed-case\">FPKPA<\/jats:styled-content>. Among boys, the frontal plane knee control improved by age. Among girls, the relationship between age and <jats:styled-content style=\"fixed-case\">FPKPA<\/jats:styled-content> was not as clear, but the oldest girls displayed the smallest mean <jats:styled-content style=\"fixed-case\">FPKPA<\/jats:styled-content> in the study (12.2\u00b0\u00a0\u00b1\u00a08.3\u00b0). The <jats:styled-content style=\"fixed-case\">FPKPA<\/jats:styled-content> was greater on the dominant kicking leg compared to the non\u2010dominant support leg (<jats:italic>P\u00a0<\/jats:italic>&lt;<jats:italic>\u00a0<\/jats:italic>.001 for boys, <jats:italic>P\u00a0<\/jats:italic>=<jats:italic>\u00a0<\/jats:italic>.001 for girls). However, side\u2010to\u2010side asymmetry in <jats:styled-content style=\"fixed-case\">FPKPA<\/jats:styled-content> was not associated with future injuries. In conclusion, frontal plane knee control in the single\u2010leg squat was not associated with lower extremity injuries among young football players. As the single\u2010leg squat to 90\u00b0 knee flexion was too demanding for many subjects, easier single\u2010leg squat test procedure or a different movement control test, such as a double\u2010legged squat, could be more suitable for the young football players.<\/jats:p>","DOI":"10.1111\/sms.13197","type":"journal-article","created":{"date-parts":[[2018,4,19]],"date-time":"2018-04-19T19:22:32Z","timestamp":1524165752000},"page":"2084-2092","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Investigation of knee control as a lower extremity injury risk factor: A prospective study in youth football"],"prefix":"10.1111","volume":"28","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3056-8169","authenticated-orcid":false,"given":"A. 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