title: Glenoid deformity in the coronal plane correlates with humeral head changes in osteoarthritis: a radiographic analysis.
abstract: BACKGROUND
  A variety of measurements can be used to assess radiographic osteoarthritic changes of the shoulder. This study aimed to analyze the correlation between the radiographic humeral-sided Samilson and Prieto classification system and 3 different radiographic classifications describing the changes of the glenoid in the coronal plane.
  
  
  METHODS
  The study material included standardized radiographs of 50 patients with idiopathic osteoarthritis before anatomic shoulder replacement. On the basis of radiographic measurements, the cases were evaluated using the Samilson and Prieto grading system, angle β, inclination type, and critical shoulder angle by 2 independent observers.
  
  
  RESULTS
  Classification measurements showed an excellent agreement between observers. Our results showed that the humeral-sided Samilson and Prieto grading system had a statistically significant good correlation with angle β (observer 1, r = 0.74; observer 2, r = 0.77; P < .05) and a statistically significant excellent correlation with the inclination type of the glenoid (observer 1, r  = 0.86; observer 2, r = 0.8; P < .05). A poor correlation to the critical shoulder angle was observed (r = -0.14, r = 0.03; P > .05).
  
  
  CONCLUSIONS
  The grade of humeral-sided osteoarthritis according to Samilson and Prieto correlates with the glenoid-sided osteoarthritic changes of the glenoid in the coronal plane described by the angle β and by the inclination type of the glenoid. Higher glenoid-sided inclination is associated with higher grade of osteoarthritis in primary shoulder osteoarthritis.
authors.affiliation: Department of Shoulder and Elbow Surgery, ATOS Clinic Munich, Munich, Germany; Trauma Department, Hannover Medical School, Hannover, Germany. Electronic address: hawi.nael@mh-hannover.de.
authors.forename: Nael
authors.initials: N
authors.lastname: Hawi
authors.affiliation: Department of Shoulder and Elbow Surgery, ATOS Clinic Heidelberg, Heidelberg, Germany; University Medical Centre Mannheim, University of Heidelberg, Heidelberg, Germany.
authors.forename: Petra
authors.initials: P
authors.lastname: Magosch
authors.affiliation: Department of Shoulder and Elbow Surgery, ATOS Clinic Munich, Munich, Germany; Department of Traumatology and Sports Injuries, Paracelsus Medical University, Salzburg, Austria.
authors.forename: Mark
authors.initials: M
authors.lastname: Tauber
authors.affiliation: Department of Shoulder and Elbow Surgery, ATOS Clinic Heidelberg, Heidelberg, Germany.
authors.forename: Sven
authors.initials: S
authors.lastname: Lichtenberg
authors.affiliation: Department of Shoulder and Elbow Surgery, ATOS Clinic Munich, Munich, Germany.
authors.forename: Frank
authors.initials: F
authors.lastname: Martetschläger
authors.affiliation: Department of Shoulder and Elbow Surgery, ATOS Clinic Munich, Munich, Germany.
authors.forename: Peter
authors.initials: P
authors.lastname: Habermeyer
mesh_terms: D000368:Aged; D000072228:Arthroplasty, Replacement, Shoulder / Q000379:methods; D003430:Cross-Sectional Studies; D005260:Female; D061165:Glenoid Cavity / Q000000981:diagnostic imaging* / Q000503:physiopathology; D006801:Humans; D058430:Humeral Head / Q000000981:diagnostic imaging* / Q000503:physiopathology; D008297:Male; D010003:Osteoarthritis / Q000000981:diagnostic imaging / Q000601:surgery*; D011859:Radiography; D012785:Shoulder Joint / Q000000981:diagnostic imaging* / Q000503:physiopathology
keywords: Glenohumeral osteoarthritis; Samilson and Prieto; angle β; critical shoulder angle; inclination type; osteoarthritis; radiographic classification; shoulder