title: Self-reported previous knee injury and low knee function increase knee injury risk in adolescent female football.
abstract: Knee injuries are common in adolescent female football. Self-reported previous knee injury and low Knee injury and Osteoarthritis Outcome Score (KOOS) are proposed to predict future knee injuries, but evidence regarding this in adolescent female football is scarce. The aim of this study was to investigate self-reported previous knee injury and low KOOS subscale score as risk factors for future knee injuries in adolescent female football. A sample of 326 adolescent female football players, aged 15-18, without knee injury at baseline, were included. Data on self-reported previous knee injury and KOOS questionnaires were collected at baseline. Time-loss knee injuries and football exposures were reported weekly by answers to standardized text-message questions, followed by injury telephone interviews. A priori, self-reported previous knee injury and low KOOS subscale scores (< 80 points) were chosen as independent variables in the risk factor analyses. The study showed that self-reported previous knee injury significantly increased the risk of time-loss knee injury [relative risk (RR): 3.65, 95% confidence (CI) 1.73-7.68; P < 0.001]. Risk of time-loss knee injury was also significantly increased in players with low KOOS subscale scores (< 80 points) in Activities of Daily Living (RR: 5.0), Sport/Recreational (RR: 2.2) and Quality of Life (RR: 3.0) (P < 0.05). In conclusion, self-reported previous knee injury and low scores in three KOOS subscales significantly increase the risk of future time-loss knee injury in adolescent female football.
authors.affiliation: Sports Orthopaedic Research Center - Copenhagen, Arthroscopic Center Amager, Department of Orthopedic Surgery, Copenhagen University Hospital, Copenhagen, Amager-Hvidovre, Denmark.|Bachelor's Degree Programme in Physiotherapy, Department of Physiotherapy and Occupational Therapy, Faculty of Health and Technology, Metropolitan University College, Copenhagen, Denmark.
authors.forename: M B
authors.identifier: http://orcid.org/0000-0003-4125-8975
authors.initials: MB
authors.lastname: Clausen
authors.affiliation: Bachelor's Degree Programme in Physiotherapy, Department of Physiotherapy and Occupational Therapy, Faculty of Health and Technology, Metropolitan University College, Copenhagen, Denmark.|CopenRehab, Section of Social Medicine, Department of Public Health, University of Copenhagen, Copenhagen, Denmark.|The Heart Centre, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark.
authors.forename: L
authors.initials: L
authors.lastname: Tang
authors.affiliation: Bachelor's Degree Programme in Physiotherapy, Department of Physiotherapy and Occupational Therapy, Faculty of Health and Technology, Metropolitan University College, Copenhagen, Denmark.|Gait Analysis Laboratory, Copenhagen University Hospital, Copenhagen, Hvidovre, Denmark.
authors.forename: M K
authors.initials: MK
authors.lastname: Zebis
authors.affiliation: Department of Nutrition, Exercise and Sports (NEXS), Section of Human Physiology, Copenhagen Centre for Team Sport and Health, University of Copenhagen, Copenhagen, Denmark.|Sport and Health Sciences, College of Life and Environmental Sciences, St. Luke's Campus, University of Exeter, Exeter, UK.
authors.forename: P
authors.initials: P
authors.lastname: Krustrup
authors.affiliation: Sports Orthopaedic Research Center - Copenhagen, Arthroscopic Center Amager, Department of Orthopedic Surgery, Copenhagen University Hospital, Copenhagen, Amager-Hvidovre, Denmark.
authors.forename: P
authors.initials: P
authors.lastname: Hölmich
authors.affiliation: Sport Medicine Clinic, Orthopaedic Department, Hospital of Lillebaelt, Institute of Regional Health Service Research and Center for Research in Childhood Health, IOB, University of Southern Denmark, Odense, Denmark.
authors.forename: N
authors.initials: N
authors.lastname: Wedderkopp
authors.affiliation: National Research Centre for the Working Environment, Copenhagen, Denmark.
authors.forename: L L
authors.initials: LL
authors.lastname: Andersen
authors.affiliation: Department of Biostatistics, University of Copenhagen, Copenhagen, Denmark.
authors.forename: K B
authors.initials: KB
authors.lastname: Christensen
authors.affiliation: Department of Public Health, Section of Sport Science, Aarhus University, Aarhus, Denmark.
authors.forename: M
authors.initials: M
authors.lastname: Møller
authors.affiliation: Sports Orthopaedic Research Center - Copenhagen, Arthroscopic Center Amager, Department of Orthopedic Surgery, Copenhagen University Hospital, Copenhagen, Amager-Hvidovre, Denmark.
authors.forename: K
authors.initials: K
authors.lastname: Thorborg
mesh_terms: D000293:Adolescent; D005260:Female; D006801:Humans; D007718:Knee Injuries / Q000503:physiopathology*; D007719:Knee Joint / Q000503:physiopathology*; D012008:Recurrence; D012307:Risk Factors; D057566:Self Report; D012916:Soccer / Q000293:injuries*; D011795:Surveys and Questionnaires
keywords: KOOS; SMS; relative risk; risk factor; text message