title: RISK FACTORS FOR BILATERAL ANTERIOR CRUCIATE LIGAMENT INJURIES.
abstract: BACKGROUND
  The aim of this study has been to identify which risk factors can influence bilateral anterior cruciate ligament injury.
  
  
  METHODS
  Thirty-two operated patients took part in this survey during the period of ten years. There were 5 women and 27 men, with average age of 30.46 years (19-55). The respondents filled in the questionnaire by answering the questions regarding the time when getting injured and operated, mechanism of injuries, genetic and anthropometric data, characteristics of sports and every day activities.
  
  
  RESULTS
  The incidence of reconstructed bilateral injuries in relation to unilateral ones was 2.3% (50/2168). The age of respondents and side of the injured knee did not correlate significantly with the achieved subjective physical activity level after the second knee surgery. The average time from the first injury to operation was 10 months and 4.3 years since that moment up to the injury of the other knee. It took more than 9 months on average until the reconstruction of contralateral anterior cruciate ligament. The most of athletes were injured in football matches. Three-quarters of athletes returned to competition activities after the first operation, which caused the same injury of the contralateral knee.
  
  
  CONCLUSIONS
  Anterior cruciate ligament rupture of the contralateral knee most often occurs in young active athletes within the first four years after the initial reconstruction. Its frequency is not affected by sex, side of extremity, genetic predisposition, type of sport, concomitant injuries and the choice of graft. Returning to the same or higher level of sports activities after the first reconstruction is one of the preconditions for injuring the other knee in the same way.
authors.forename: Vladimir
authors.initials: V
authors.lastname: Ristić
authors.forename: Siniša
authors.initials: S
authors.lastname: Ristić
authors.forename: Mirsad
authors.initials: M
authors.lastname: Maljanović
authors.forename: Vladimir
authors.initials: V
authors.lastname: Đan
authors.forename: Vukadin
authors.initials: V
authors.lastname: Milankov
authors.forename: Vladimir
authors.initials: V
authors.lastname: Harhaji
mesh_terms: D000203:Activities of Daily Living; D000328:Adult; D016118:Anterior Cruciate Ligament / Q000601:surgery; D000070598:Anterior Cruciate Ligament Injuries; D059549:Anterior Cruciate Ligament Reconstruction / Q000379:methods; D001265:Athletic Injuries / Q000453:epidemiology* / Q000503:physiopathology / Q000601:surgery; D005260:Female; D006801:Humans; D015994:Incidence; D007718:Knee Injuries / Q000453:epidemiology* / Q000503:physiopathology / Q000601:surgery; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D018570:Risk Assessment; D012307:Risk Factors; D055771:Serbia / Q000453:epidemiology; D055815:Young Adult