The influence of humeral head inclination in reverse total shoulder arthroplasty: A systematic review

Brandon J. Erickson, Rachel M. Frank, Joshua D. Harris, Nathan Mall, Anthony A. Romeo

Research output: Contribution to journalArticle

45 Scopus citations

Abstract

Background: Humeral component inclination may play an important role in implant stability and the incidence of scapular notching in reverse total shoulder arthroplasty (RTSA). This study was conducted to determine if a difference exists between RTSA prostheses with a 135° vs 155° humeral component inclination angle with respect to dislocation rates and scapular notching rates. We hypothesized that the rate of dislocation would be significantly higher with the 135° inclination design and that the rate of scapular notching would be significantly higher with the 155° inclination design. Methods: A systematic review was registered with PROSPERO and performed with Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) guidelines using 3 publicly available free databases. Therapeutic clinical outcome investigations reporting the number of dislocations, number of patients with scapular notching, and postoperative range of motion after RTSA with levels of evidence I to IV were eligible for inclusion. All study and subject demographics were analyzed. Statistics were calculated using 2-proportion z tests. Results: Thirty-eight studies including 2222 shoulders (average age, 70.3 ± 3.91years; 67% female) undergoing RTSA were included. Of these, 1762 (79.3%) used the 155° inclination prosthesis and 460 (20.7%) used the 135° inclination prosthesis with a lateralized glenosphere. The rate of scapular notching was 2.83% in the 135° group and 16.80% in the 155° group (. P<.0001, z=-7.7107). The rate of dislocation was 1.74% in the 135° group and 2.33% in the 155° group (. P=.4432, z=-0.7669). Conclusions: Our systematic review of 38 studies and 2222 shoulders found that the rate of scapular nothing was significantly higher with the 155° prosthesis than with the 135° prosthesis with a lateralized glenosphere, with no difference in dislocation rates between prostheses.

Original languageEnglish (US)
Pages (from-to)988-993
Number of pages6
JournalJournal of Shoulder and Elbow Surgery
Volume24
Issue number6
DOIs
StatePublished - Jun 1 2015

Keywords

  • Dislocation
  • Head neck angle
  • Reverse total shoulder arthroplasty
  • Rotator cuff arthropathy
  • Scapular notch

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Surgery

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