title: The importance of glenoid version in patients with anterior dislocation of the shoulder.
abstract: BACKGROUND
  Although increased retroversion of the glenoid has been shown to be an important factor in posterior instability of the shoulder, there are few studies reporting glenoid bone structure as a risk factor in anterior dislocation of the shoulder. This study aimed to compare glenoid version in patients with anterior dislocation of the shoulder and individuals in a control group with no shoulder problems before undergoing computed tomography and to assess a possible relationship between demographic characteristics and glenoid version angle.
  
  
  METHODS
  The study group comprised 63 patients (12 women and 51 men; mean age, 35.71 years) with 1 or multiple unilateral anterior dislocations of the shoulder (dislocated group), whereas 63 individuals (11 women and 52 men; mean age, 35.38 years) with no history of shoulder complaints and no signs of instability constituted the control group. The glenoid version angle was measured on an axial cut of the computed tomography scan.
  
  
  RESULTS
  The glenoid version angles on the dislocated side in the study group were significantly more anteverted than those of the dominant (P < .001) and nondominant (P = .023) shoulders of the control group. The version angles of dislocated shoulders significantly differed from those of nondislocated shoulders of both men (P = .041) and women (P = .049). There was no significant relationship between the glenoid version angle on the dislocated side and dislocation mechanism (P = .883), age group (P = .356), or number of dislocations (P = .971).
  
  
  CONCLUSIONS
  Glenoid version is an important factor for the development of anterior dislocation of the shoulder.
authors.affiliation: Department of Orthopaedics and Traumatology, İzzet Baysal Training and Research Hospital, Abant İzzet Baysal University, Bolu, Turkey. Electronic address: aygun.umit@yahoo.com.
authors.forename: Ümit
authors.initials: Ü
authors.lastname: Aygün
authors.affiliation: İzzet Baysal Physical Medicine and Rehabilitation Training and Research Hospital, Abant İzzet Baysal University, Bolu, Turkey.
authors.forename: Yalkın
authors.initials: Y
authors.lastname: Çalik
authors.affiliation: Department of Orthopaedics and Traumatology, İzzet Baysal Training and Research Hospital, Abant İzzet Baysal University, Bolu, Turkey.
authors.forename: Cengiz
authors.initials: C
authors.lastname: Işik
authors.affiliation: Department of Radiology, Tepecik Training and Research Hospital, İzmir, Turkey.
authors.forename: Hilal
authors.initials: H
authors.lastname: Şahin
authors.affiliation: Department of Radiology, İzzet Baysal Training and Research Hospital, Abant İzzet Baysal University, Bolu, Turkey.
authors.forename: Rula
authors.initials: R
authors.lastname: Şahin
authors.affiliation: İzzet Baysal Psychiatry Training and Research Hospital, Abant İzzet Baysal University, Bolu, Turkey.
authors.forename: Derya Öktem
authors.initials: DÖ
authors.lastname: Aygün
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000000981:diagnostic imaging*; D008297:Male; D012189:Retrospective Studies; D012307:Risk Factors; D012783:Shoulder Dislocation / Q000000981:diagnostic imaging*; D012785:Shoulder Joint / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed
keywords: Anterior shoulder dislocation; computed tomography; demographic characteristics; dominant/nondominant shoulder; glenohumeral joint; glenoid version