title: Comparative study of total shoulder arthroplasty versus total shoulder surface replacement for glenohumeral osteoarthritis with minimum 2-year follow-up.
abstract: BACKGROUND
  Compared with total shoulder arthroplasty (TSA), total shoulder surface replacement (TSSR) may offer the advantage of preservation of bone stock and shorter surgical time, possibly at the expense of glenoid component positioning and increasing lateral glenohumeral offset. We hypothesized that in patients treated for osteoarthritis with a sufficient rotator cuff, TSA and TSSR patients have comparable functional outcome, glenoid component version, and lateral glenohumeral offset.
  
  
  METHODS
  We conducted a retrospective cohort study with a minimum of 2 years of follow-up. Patients in the TSA and TSSR groups received a cemented, curved, keeled, all-poly glenoid component. A cemented anatomical humeral stem was used in TSA. TSSR involved a humeral surface replacement (all components from Tornier Inc., St Ismier, France). Patients were assessed for functional outcome. Radiographs were assessed for radiolucent lines. Glenoid component position and lateral glenohumeral offset were assessed using computed tomography images.
  
  
  RESULTS
  After 29 and 34 months of mean follow-up, respectively, TSA (n = 29) and TSSR (n = 20) groups showed similar median adjusted Constant Scores (84% vs. 88%), Oxford Shoulder Scores (44 vs. 44), Disabilities of the Arm, Shoulder and Hand scores (22 vs. 15), and Dutch Simple Shoulder Test scores (10 vs. 11). Glenoid components showed similar radiolucent line counts (median, 0 vs. 0), similar anteversion angles (mean, 0° vs. 2°), and similar preoperative to postoperative increases in lateral glenohumeral offset (mean, 4 vs. 5 mm). One intraoperative glenoid fracture occurred in the TSSR group.
  
  
  CONCLUSIONS
  Short-term functional and radiographic outcomes were comparable for TSA and TSSR.
authors.affiliation: Department of Orthopaedic Surgery, Onze Lieve Vrouwe Gasthuis, Amsterdam, The Netherlands. Electronic address: bwkooistra@gmail.com.
authors.forename: Bauke W
authors.initials: BW
authors.lastname: Kooistra
authors.affiliation: Department of Orthopaedic Surgery, Onze Lieve Vrouwe Gasthuis, Amsterdam, The Netherlands; Department of Orthopaedic Surgery, Lairesse Kliniek, Amsterdam, The Netherlands.
authors.forename: W Jaap
authors.initials: WJ
authors.lastname: Willems
authors.affiliation: Department of Orthopaedic Surgery, Onze Lieve Vrouwe Gasthuis, Amsterdam, The Netherlands.
authors.forename: Eelke
authors.initials: E
authors.lastname: Lemmens
authors.affiliation: Department of Orthopaedic Surgery, Onze Lieve Vrouwe Gasthuis, Amsterdam, The Netherlands.
authors.forename: Bas P
authors.initials: BP
authors.lastname: Hartel
authors.affiliation: Department of Orthopaedic Surgery, Onze Lieve Vrouwe Gasthuis, Amsterdam, The Netherlands.
authors.forename: Michel P J
authors.initials: MP
authors.lastname: van den Bekerom
authors.affiliation: Department of Orthopaedic Surgery, Onze Lieve Vrouwe Gasthuis, Amsterdam, The Netherlands.
authors.forename: Derek F P
authors.initials: DF
authors.lastname: van Deurzen
mesh_terms: D000368:Aged; D000072228:Arthroplasty, Replacement, Shoulder / Q000379:methods*; D015331:Cohort Studies; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D010003:Osteoarthritis / Q000601:surgery*; D063868:Patient Outcome Assessment; D012189:Retrospective Studies; D012785:Shoulder Joint / Q000000981:diagnostic imaging / Q000601:surgery*; D000072227:Shoulder Prosthesis
keywords: complications; functional outcome; glenoid loosening; lateral glenohumeral offset; total shoulder arthroplasty; total shoulder surface replacement