title: Prevalence of the association of subacromial impingement with subcoracoid impingement and their clinical effects.
abstract: OBJECTIVE
  A prospective study to determine how commonly chronic subacromial impingement is associated with subcoracoid impingement and to evaluate clinical outcome after arthroscopic subacromial decompression (ASD).
  
  
  METHODS
  Subacromial and coracohumeral distances were evaluated in  patients with chronic shoulder pain before and after ASD, using magnetic resonance imaging and the University of California at Los Angeles (UCLA) shoulder scale and Constant-Murley shoulder assessment.
  
  
  RESULTS
  A total of 40 patients were included in the study; patients were followed  up for a mean of 27.3 months. Before ASD, 14 (35%) patients with chronic subacromial impingement also had subcoracoid impingement. In these patients, the mean coracohumeral distance was 7.18 mm (range 5.00 - 11.00 mm). After ASD, no patient had subcoracoid impingement, and the mean coracohumeral  distance was significantly longer than pre-ASD, 12.85 mm (range 11.00 - 15.00 mm). The Constant-Murley shoulder assessment and UCLA shoulder scale both showed improvement after ASD.
  
  
  CONCLUSIONS
  Chronic subacromial impingement occurred together with subcoracoid impingement in 35%  of patients presenting with chronic shoulder pain. Following ASD, the coracohumeral distance increased with remission from pain.
authors.affiliation: Department of Orthopaedics and Trauma, Regional Education and Research Hospital, Erzurum, Turkey.
authors.forename: M
authors.initials: M
authors.lastname: Misirlioglu
authors.forename: A
authors.initials: A
authors.lastname: Aydin
authors.forename: V
authors.initials: V
authors.lastname: Yildiz
authors.forename: A
authors.initials: A
authors.lastname: Dostbil
authors.forename: M
authors.initials: M
authors.lastname: Kilic
authors.forename: P
authors.initials: P
authors.lastname: Aydin
mesh_terms: D000328:Adult; D000368:Aged; D019299:Decompression, Surgical; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D012782:Shoulder / Q000601:surgery; D019534:Shoulder Impingement Syndrome / Q000150:complications* / Q000601:surgery; D020069:Shoulder Pain / Q000175:diagnosis* / Q000473:pathology; D016896:Treatment Outcome