title: Functional outcome of reverse shoulder tumor prosthesis in the treatment of proximal humerus tumors.
abstract: BACKGROUND
  The treatment of proximal humerus tumors with reverse shoulder arthroplasty with allograft augmentation is still controversial. A tumor prosthesis represents a proven solution for such osseous defects. We investigated the functional results of patients who underwent reverse shoulder tumor prosthesis (RSTP) without the use of allograft after resection of a proximal humerus tumor.
  
  
  METHODS
  We retrospectively evaluated 10 patients with malignant proximal humerus tumors who had undergone RSTP, with a mean follow-up period of 18.2 months (range, 6-27 months). The average age of the patients was 49.4 years. The mean resection length was 10.2 cm (range, 6-16 cm). The tumor prosthesis was preferred for the humeral component. Released rotator cuff muscles were reattached to the prosthesis with nonabsorbable sutures.
  
  
  RESULTS
  The mean active forward flexion was 96° (range, 30°-160°), the mean active abduction was 88° (range, 30°-160°), and the mean active external rotation was 13° (range, 0°-20°). The mean Constant-Murley score was 53.7%. The mean Disabilities of the Arm, Shoulder, and Hand score was 26.2. The mean visual analog scale score was 1.3. The mean Musculoskeletal Tumor Society score was 78.1%. None of our patients have shown local recurrence or infection signs in the follow-up period.
  
  
  CONCLUSIONS
  Functionally satisfying results and a stable shoulder can be achieved by reverse shoulder arthroplasty without the need for an allograft. An intact abductor mechanism with a shorter resection humerus length produced good results. The treatment of malignant proximal humerus tumors with RSTP is an alternative that minimizes surgery time and complexity.
authors.affiliation: Cerrahpasa Medical Faculty, Orthopaedics and Traumatology Department, Istanbul University, Istanbul, Turkey. Electronic address: mfguven@yahoo.com.
authors.forename: Mehmet Fatih
authors.initials: MF
authors.lastname: Guven
authors.affiliation: Cerrahpasa Medical Faculty, Orthopaedics and Traumatology Department, Istanbul University, Istanbul, Turkey.
authors.forename: Lercan
authors.initials: L
authors.lastname: Aslan
authors.affiliation: Cerrahpasa Medical Faculty, Orthopaedics and Traumatology Department, Istanbul University, Istanbul, Turkey.
authors.forename: Huseyin
authors.initials: H
authors.lastname: Botanlioglu
authors.affiliation: Cerrahpasa Medical Faculty, Orthopaedics and Traumatology Department, Istanbul University, Istanbul, Turkey.
authors.forename: Gokhan
authors.initials: G
authors.lastname: Kaynak
authors.affiliation: Kaktus Health Clinic, Istanbul, Turkey.
authors.forename: Hayrettin
authors.initials: H
authors.lastname: Kesmezacar
authors.affiliation: Cerrahpasa Medical Faculty, Orthopaedics and Traumatology Department, Istanbul University, Istanbul, Turkey.
authors.forename: Muharrem
authors.initials: M
authors.lastname: Babacan
mesh_terms: D000328:Adult; D000368:Aged; D019643:Arthroplasty, Replacement / Q000379:methods*; D001859:Bone Neoplasms / Q000601:surgery*; D004185:Disability Evaluation; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D006811:Humerus / Q000601:surgery*; D007595:Joint Prosthesis; D008297:Male; D008875:Middle Aged; D016059:Range of Motion, Articular; D012189:Retrospective Studies; D012399:Rotation; D012785:Shoulder Joint / Q000503:physiopathology* / Q000601:surgery*; D016896:Treatment Outcome
keywords: Malawer classification; Reverse shoulder; arthroplasty; proximal humerus tumors; tumor prosthesis