title: Influence of Glenosphere Design on Outcomes and Complications of Reverse Arthroplasty: A Systematic Review.
abstract: BACKGROUND
  Different implant designs are utilized in reverse shoulder arthroplasty. The purpose of this systematic review was to evaluate the results of reverse shoulder arthroplasty using a traditional (Grammont) prosthesis and a lateralized prosthesis for the treatment of cuff tear arthropathy and massive irreparable rotator cuff tears.
  
  
  METHODS
  A systematic review of the literature was performed via a search of two electronic databases. Two reviewers evaluated the quality of methodology and retrieved data from each included study. In cases where the outcomes data were similar between studies, the data were pooled using frequency-weighted mean values to generate summary outcomes.
  
  
  RESULTS
  Thirteen studies met the inclusion and exclusion criteria. Demographics were similar between treatment groups. The frequency-weighted mean active external rotation was 24° in the traditional group and 46° in the lateralized group (p = 0.0001). Scapular notching was noted in 44.9% of patients in the traditional group compared to 5.4% of patients in the lateralized group (p = 0.0001). The rate of clinically significant glenoid loosening was 1.8% in the traditional group and 8.8% in the lateralized group (p = 0.003).
  
  
  CONCLUSIONS
  Both the traditional Grammont and the lateralized offset reverse arthroplasty designs can improve pain and function in patients with diagnoses of cuff tear arthropathy and irreparable rotator cuff tear. While a lateralized design can result in increased active external rotation and decreased rates of scapular notching, there may be a higher rate of glenoid baseplate loosening.
authors: Sidney Kimmel Medical College at Thomas Jefferson University, Philadelphia, PA, USA.
authors: Cassandra
authors: C
authors: Lawrence
authors: Department of Orthopaedic Surgery, Rothman Institute, Thomas Jefferson University, Philadelphia, PA, USA.
authors: Gerald R
authors: GR
authors: Williams
authors: Department of Orthopaedic Surgery, Rothman Institute, Thomas Jefferson University, Philadelphia, PA, USA.
authors: Surena
authors: S
authors: Namdari
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019643:Arthroplasty, Replacement / Q000009:adverse effects / Q000295:instrumentation / Q000706:statistics & numerical data; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications; D011474:Prosthesis Design; D017006:Rotator Cuff / Q000601:surgery*; D000072227:Shoulder Prosthesis / Q000009:adverse effects / Q000706:statistics & numerical data; D016896:Treatment Outcome
keywords: Replacement arthroplasty; Rotator cuff; Shoulder