title: Morphologic features of humeral head and glenoid version in the normal glenohumeral joint.
abstract: BACKGROUND
  The morphologic features and clinical significance of version of the humeral head and glenoid remain unclear. The purpose of this study was to evaluate the normal values of humeral head version and glenoid version on computed tomography scans and to clarify their features in the normal glenohumeral joint.
  
  
  METHODS
  Images for analysis were computed tomography scans of 410 normal shoulders from healthy volunteers. Values of humeral head and glenoid version were measured. In glenoid version measurement, 3-dimensionally corrected slices were reconstructed to eliminate scapular inclination. Differences in humeral head version and glenoid version were assessed between dominant and nondominant shoulders and between men and women. Correlation analyses were also performed in the values of version between dominant and nondominant shoulders and between humeral head version and glenoid version.
  
  
  RESULTS
  The values of humeral head retroversion were widely distributed from -2° to 60°, with an average of 26° ± 11°. Average glenoid retroversion was 1° ± 3°, ranging from -9° to 13°. Both humeral head retroversion and glenoid retroversion were significantly higher on the dominant side than on the nondominant side and significantly higher in men than in women. Humeral head version and glenoid version values were well correlated with those of the contralateral shoulder. No correlation was found between humeral head version and glenoid version.
  
  
  CONCLUSIONS
  This study found differences in humeral head version and glenoid version by sex and shoulder dominance in a large sample. Both the humeral head and glenoid are thought to be more retroverted in high-demand shoulders.
authors.affiliation: Department of Orthopedic Surgery, School of Medicine, Keio University, Tokyo, Japan. Electronic address: noboru18@gmail.com.
authors.forename: Noboru
authors.initials: N
authors.lastname: Matsumura
authors.affiliation: Department of Orthopedic Surgery, Eiju General Hospital, Tokyo, Japan.
authors.forename: Kiyohisa
authors.initials: K
authors.lastname: Ogawa
authors.affiliation: Kobayashi Clinic, Iwanai, Japan.
authors.forename: Shuzo
authors.initials: S
authors.lastname: Kobayashi
authors.affiliation: Department of Orthopedic Surgery, School of Medicine, Keio University, Tokyo, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Oki
authors.affiliation: Department of Orthopedic Surgery, Ito Municipal Hospital, Ito, Japan.
authors.forename: Anri
authors.initials: A
authors.lastname: Watanabe
authors.affiliation: Department of Orthopedic Surgery, Toho University Ohashi Medical Center, Tokyo, Japan.
authors.forename: Hiroyasu
authors.initials: H
authors.lastname: Ikegami
authors.affiliation: Department of Orthopedic Surgery, School of Medicine, Keio University, Tokyo, Japan.
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Toyama
mesh_terms: D000328:Adult; D005260:Female; D064368:Healthy Volunteers; D006801:Humans; D058430:Humeral Head / Q000000981:diagnostic imaging*; D008297:Male; D012540:Scapula / Q000000981:diagnostic imaging*; D012737:Sex Factors; D012785:Shoulder Joint / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed; D055815:Young Adult
keywords: Shoulder morphology; glenoid morphology; glenoid retroversion; humeral head retroversion; humeral torsion; humerus morphology; shoulder arthroplasty