title: Total shoulder arthroplasty using an inlay mini-glenoid component for glenoid deficiency: a 2-year follow-up of 9 shoulders in 7 patients.
abstract: BACKGROUND
  Glenoid bone loss and severe retroversion can pose difficulties when implanting a glenoid component for total shoulder arthroplasty for primary osteoarthritis. Mini-glenoid implants may be useful in the setting of severe glenoid wear in which a standard pegged glenoid component cannot be placed.
  
  
  METHODS
  This study is a retrospective review, performed over a 3-year period, of patients who received a total shoulder arthroplasty using an inset mini-glenoid in the setting of severe glenoid dysplasia and/or medial glenoid bone loss. We identified patients with a minimum of 2 years' follow-up and evaluated preoperative and postoperative range of motion, visual analog scale scores, Single Assessment Numeric Evaluation scores, complications, and patient satisfaction.
  
  
  RESULTS
  Seven patients (4 female and 3 male patients; 9 shoulders) with a mean age of 66 years were treated with the described procedure and had a mean follow-up of 34 months. There were 6 primary arthroplasties and 3 revision cases. Four shoulders were classified as Walch type A2 glenoids, 2 were classified as Walch type C, and 3 were unable to be classified. There was a statistically significant increase in range of motion (forward elevation, 48°; external rotation, 14°), decrease in pain scores (8 points to 1 point), and improvement in Single Assessment Numeric Evaluation scores (31.7% to 89.4%). The mean patient satisfaction score was 8.6 points on a 10-point scale.
  
  
  CONCLUSIONS
  At 2-year follow-up, total shoulder arthroplasty with a mini-glenoid component can offer adequate pain relief and functional results in the setting of glenoid bone loss or severe retroversion.
authors.affiliation: Department of Orthopaedic Surgery, Thomas Jefferson University Hospital, Philadelphia, PA, USA. Electronic address: daniel.e.davis@gmail.com.
authors.forename: Daniel E
authors.initials: DE
authors.lastname: Davis
authors.affiliation: Kaiser Permanente Medical Center, Panorama City, CA, USA.
authors.forename: Daniel
authors.initials: D
authors.lastname: Acevedo
authors.affiliation: Sidney Kimmel Medical College at Thomas Jefferson University, Philadelphia, PA, USA.
authors.forename: Alexis
authors.initials: A
authors.lastname: Williams
authors.affiliation: The Rothman Institute at Thomas Jefferson University, Philadelphia, PA, USA.
authors.forename: Gerald
authors.initials: G
authors.lastname: Williams
mesh_terms: D000328:Adult; D000368:Aged; D000072228:Arthroplasty, Replacement, Shoulder; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D010003:Osteoarthritis / Q000473:pathology / Q000601:surgery*; D017060:Patient Satisfaction; D016059:Range of Motion, Articular; D012189:Retrospective Studies; D012540:Scapula / Q000473:pathology*; D012785:Shoulder Joint; D000072227:Shoulder Prosthesis; D016896:Treatment Outcome
keywords: Shoulder arthroplasty; glenoid bone loss; glenoid deficiency; glenoid dysplasia; inlay glenoid; mini-glenoid