title: Risk factors for noncontact anterior cruciate ligament injury: Analysis of parameters in proximal tibia using anteroposterior radiography.
abstract: OBJECTIVE
  To investigate the relationship between the proximal tibial parameters of tibia width (TW), eminence width (EW), and eminence width index (EWI), and noncontact anterior cruciate ligament (ACL) injury, in a Chinese population.
  
  
  METHODS
  A retrospective case-control study was conducted of all ACL reconstructions (ACL group) and meniscal surgeries (control group) undertaken at two Chinese hospitals. Patients in the ACL group were age- and sex-matched with controls. Anteroposterior knee radiographs were used to measure the TW, EW and EWI.
  
  
  RESULTS
  A total of 73 pairs of patients who were verified by knee arthroscopy, magnetic resonance imaging and physical examination were included in the study. There was no significant difference between the ACL group and the control group in terms of TW in the total population and in the two sex subgroups. The ACL group had a significantly smaller EW and EWI compared with the control group in the total population and in the two sex subgroups.
  
  
  CONCLUSIONS
  Decreased EW and EWI are associated with increased risk of noncontact ACL injury in a Chinese population.
authors.affiliation: Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, Hunan Province, China.
authors.forename: Wen-Feng
authors.initials: WF
authors.lastname: Xiao
authors.affiliation: Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, Hunan Province, China.
authors.forename: Tuo
authors.initials: T
authors.lastname: Yang
authors.affiliation: Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, Hunan Province, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Cui
authors.affiliation: Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, Hunan Province, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Zeng
authors.affiliation: Department of Orthopaedics, Third Xiangya Hospital, Central South University, Changsha, Hunan Province, China.
authors.forename: Song
authors.initials: S
authors.lastname: Wu
authors.affiliation: Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, Hunan Province, China.
authors.forename: Yi-Lun
authors.initials: YL
authors.lastname: Wang
authors.affiliation: Department of Orthopaedics, Xiangya Hospital, Central South University, Changsha, Hunan Province, China lgh9640@sina.cn.
authors.forename: Guang-Hua
authors.initials: GH
authors.lastname: Lei
mesh_terms: D000328:Adult; D016118:Anterior Cruciate Ligament / Q000000981:diagnostic imaging*; D000070598:Anterior Cruciate Ligament Injuries; D003710:Demography; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging / Q000473:pathology; D008297:Male; D012307:Risk Factors; D013977:Tibia / Q000000981:diagnostic imaging* / Q000473:pathology*
keywords: Anterior cruciate ligament injury; eminence width; risk factor; tibia width