title: Are there differences between stemless and conventional stemmed shoulder prostheses in the treatment of glenohumeral osteoarthritis?
abstract: BACKGROUND
  Conventional stemmed anatomical shoulder prostheses are widely used in the treatment of glenohumeral osteoarthritis. The stemless shoulder prosthesis, in contrast, is a new concept, and fewer outcome studies are available. Therefore, the purpose of the study was to investigate the early functional outcome and postoperative proprioception of a stemless prosthesis in comparison with a standard stemmed anatomic shoulder prosthesis.
  
  
  METHODS
  Twelve patients (mean age 68.3 years [SD ± 5.4]; 5 female, 7 male) with primary glenohumeral osteoarthritis of the shoulder were enrolled, who underwent total shoulder arthroplasty (TSA) with a stemless total shoulder prosthesis, Total Evolution Shoulder System (TESS; Biomed, France). The control group consisted of twelve (age and gender matched) patients (mean age 67.8 years; [SD ± 7.1]; 9 female, 3 male), getting a TSA with a standard anatomic stemmed prosthesis, Aequalis Shoulder (Tournier, Lyon, France). Patients were examined the day before and six months after surgery. The pre- and postoperative Constant Score (CS) was evaluated and proprioception was measured in a 3D video motion analysis study using an active angle-reproduction (AAR) test.
  
  
  RESULTS
  Comparing the postoperative CS, there was no significant difference between the groups treated with the TESS prosthesis (48.0 ± 13.8 points) and the Aequalis prosthesis (49.3 ± 8.6 points; p = 0.792). There was no significant difference in postoperative proprioception between the TESS group (7.2° [SD ± 2.8]) and the Aequalis group(8.7° [SD ± 2.7]; p = 0.196), either. Comparison of in the results of CS and AAR test pre- and postoperatively showed no significant differences between the groups.
  
  
  CONCLUSIONS
  In patients with glenohumeral osteoarthritis, treated with TSA, the functional and the proprioceptive outcome is comparable between a stemless and a standard stemmed anatomic shoulder prosthesis at early followup.
  
  
  CONCLUSIONS
  Further follow-up is necessary regarding the long-term performance of this prosthesis.
  
  
  BACKGROUND
  Current Controlled Trials DRKS 00007528 . Registered 17 November 2014.
authors.affiliation: Clinic for Orthopedics and Trauma Surgery, Heidelberg University Hospital, Schlierbacher Landstraße 200a, D-69118, Heidelberg, Germany. m.w.maier@web.de.
authors.forename: Michael W
authors.initials: MW
authors.lastname: Maier
authors.affiliation: Clinic for Orthopedics and Trauma Surgery, Heidelberg University Hospital, Schlierbacher Landstraße 200a, D-69118, Heidelberg, Germany. sarah.lauer@med.uni-heidelberg.de.
authors.forename: Sarah
authors.initials: S
authors.lastname: Lauer
authors.affiliation: Clinic for Orthopedics and Trauma Surgery, Heidelberg University Hospital, Schlierbacher Landstraße 200a, D-69118, Heidelberg, Germany. matthias.klotz@med.uni-heidelberg.de.
authors.forename: Matthias C
authors.initials: MC
authors.lastname: Klotz
authors.affiliation: Clinic for Orthopedics and Trauma Surgery, Heidelberg University Hospital, Schlierbacher Landstraße 200a, D-69118, Heidelberg, Germany. Matthias.buelhoff@med.uni-heidelberg.de.
authors.forename: Matthias
authors.initials: M
authors.lastname: Bülhoff
authors.affiliation: Clinic for Orthopedics and Trauma Surgery, Heidelberg University Hospital, Schlierbacher Landstraße 200a, D-69118, Heidelberg, Germany. david.spranz@med.uni-heidelberg.de.
authors.forename: David
authors.initials: D
authors.lastname: Spranz
authors.affiliation: Clinic for Orthopedics and Trauma Surgery, Heidelberg University Hospital, Schlierbacher Landstraße 200a, D-69118, Heidelberg, Germany. felix.zeifang@med.uni-heidelberg.de.
authors.forename: Felix
authors.initials: F
authors.lastname: Zeifang
mesh_terms: D000368:Aged; D019643:Arthroplasty, Replacement / Q000295:instrumentation* / Q000379:methods; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007595:Joint Prosthesis / Q000592:standards*; D008297:Male; D008875:Middle Aged; D010003:Osteoarthritis / Q000175:diagnosis / Q000601:surgery*; D012785:Shoulder Joint / Q000473:pathology / Q000601:surgery*; D016896:Treatment Outcome