title: The prevalence of glenohumeral osteoarthrosis in unstable shoulders.
abstract: BACKGROUND
  Glenohumeral osteoarthritis has been a well-described complication of open procedures to correct shoulder instability. What remains unknown is whether chondral injuries sustained during instability episodes contribute to osteoarthritis or whether the cause is primarily the stabilization procedure itself.
  
  
  OBJECTIVE
  To determine the prevalence of osteoarthrosis in a large database of patients with acute and chronic shoulder instability before primary stabilization surgery.
  
  
  METHODS
  Retrospective review of prospectively collected data.
  
  
  METHODS
  Surgical and demographic data were collected on 422 patients with a diagnosis of shoulder instability who underwent arthroscopic examination and shoulder stabilization.
  
  
  RESULTS
  There was a significant association between the grade of osteoarthrosis and the presence of osteoarthritis (grade III or IV chondral damage) with time from injury to surgery. Patients with osteoarthritis were significantly older than those without (34.9 versus 29.6 years). Multivariate analysis identified older age and time from injury to surgery as independent predictors of osteoarthritis. We found no association between direction of instability and the presence of osteoarthritis.
  
  
  CONCLUSIONS
  The overall prevalence of glenohumeral osteoarthrosis was low. Predictors of osteoarthritis included time from injury to surgery and age.
authors.affiliation: Steadman-Hawkins Sports Medicine Foundation, Vail, Colorado 81657, USA.
authors.forename: Michelle L
authors.initials: ML
authors.lastname: Cameron
authors.forename: Mininder S
authors.initials: MS
authors.lastname: Kocher
authors.forename: Karen K
authors.initials: KK
authors.lastname: Briggs
authors.forename: Marilee P
authors.initials: MP
authors.lastname: Horan
authors.forename: Richard J
authors.initials: RJ
authors.lastname: Hawkins
mesh_terms: D000208:Acute Disease; D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000704:Analysis of Variance; D001182:Arthroscopy; D002358:Cartilage, Articular / Q000293:injuries; D002648:Child; D002675:Child, Preschool; D002908:Chronic Disease; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000503:physiopathology* / Q000601:surgery; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D010003:Osteoarthritis / Q000145:classification / Q000453:epidemiology* / Q000503:physiopathology / Q000601:surgery; D015995:Prevalence; D012785:Shoulder Joint / Q000503:physiopathology* / Q000601:surgery; D013997:Time Factors; D014481:United States / Q000453:epidemiology