title: Clinical and radiological results of a cementless short stem shoulder prosthesis at minimum follow-up of two years.
abstract: OBJECTIVE
  Uncemented short stem shoulder arthroplasty combines the advantages of a bone-saving implantation with a straightforward revision option. Uncemented humeral long stems can be associated with stress shielding and loosening. Therefore, we analysed the clinical and radiological outcome of a short stem shoulder prosthesis with metaphyseal fixation.
  
  
  METHODS
  This two-centre study included 82 total shoulder arthroplasties in 80 patients with short stem shoulder prosthesis and a cemented polyethylene glenoid performed between 2010 and 2012. Sixty-eight shoulders had primary osteoarthritis, eight shoulders had post traumatic sequelae and six had other diagnoses. Minimum follow-up was two years. Outcome data included the Constant Score (CS), Subjective Shoulder Value (SSV), Pain Scale (0-15) and range of motion. Radiographic evaluation was done in shoulders with primary osteoarthritis in a standard view.
  
  
  RESULTS
  The mean clinical and radiological follow-up was 31.2 ± 7.2 months (20-52). CS improved from 36.7 ± 15.2 % to 90.4 ± 16.4% and SSV improved from 39.4 ± 15.5 points to 85.5 ± 13.2 points (p < 0.0001). Pain was rated as mild or none in 76 shoulders (92.7%) with a mean value of 13.2 ± 2.6. The mean active flexion was 157.0 ± 24.7°, abduction was 152.6 ± 29.1° and the active external rotation was 38.2 ± 14.8° at recent follow-up. Radiographic assessment was done in 44 shoulders. Six shoulders (13.6%) showed features of slight stress shielding at the medial cortex and no stem with subsidence was found. Three glenoids (6.8%) had minor radiolucent lines.
  
  
  CONCLUSIONS
  Uncemented short stem shoulder arthroplasty with a cemented polyethylene glenoid can yield a stable fixation with a good clinical outcome at minimum follow-up of two years.
authors.affiliation: Abteilung für Unfallchirurgie und Orthopädie, Berufsgenossenschaftliche Unfallklinik Ludwigshafen, Ludwig-Guttmann-Strasse 13, 67071, Ludwigshafen on the Rhine, Germany, marcschnetzke@gmx.de.
authors.forename: Marc
authors.initials: M
authors.lastname: Schnetzke
authors.forename: Sebastian
authors.initials: S
authors.lastname: Coda
authors.forename: Gilles
authors.initials: G
authors.lastname: Walch
authors.forename: Markus
authors.initials: M
authors.lastname: Loew
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001172:Arthritis, Rheumatoid / Q000601:surgery; D019643:Arthroplasty, Replacement / Q000379:methods; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007595:Joint Prosthesis; D008297:Male; D008875:Middle Aged; D010003:Osteoarthritis / Q000601:surgery; D010147:Pain Measurement; D011474:Prosthesis Design; D019919:Prosthesis Implantation; D016059:Range of Motion, Articular; D012785:Shoulder Joint / Q000503:physiopathology / Q000601:surgery*; D016896:Treatment Outcome