Acromial and glenoid morphology in glenohumeral osteoarthritis: a three-dimensional analysis

Peter N. Chalmers, Matt Miller, John C. Wheelwright, Jun Kawakami, Heath B. Henninger, Robert Z. Tashjian

Research output: Contribution to journalArticlepeer-review

Abstract

Background: The purpose of this study was to determine the association between glenohumeral osteoarthritis (GHOA) and three-dimensional acromial and glenoid morphology. Methods: In this retrospective study, we compared computed tomographic studies of three groups of scapulae: normal healthy, mild GHOA (Samilson-Prieto grade 1), and severe GHOA (Samilson-Prieto grade 3). All scans were segmented to create three-dimensional reconstructions. From these models, critical shoulder angle and acromial offset were measured, as normalized to scapular height. The coronal plane inclination of the glenoid was measured using a glenoid sphere-fit method. Reliability was confirmed via intraclass correlation coefficients > 0.75. Results: Eighty scapulae were included: 30 normal, 20 mild GHOA, and 30 severe GHOA. There were no differences in acromial offset between the normal group and either the mild-GHOA group or the severe-GHOA group. The severe-GHOA group had a smaller critical shoulder angle than either the normal (30 ± 5° vs. 34 ± 4°, P =.003) or mild-GHOA groups (34 ± 4°, P =.020), but the normal and mild-GHOA groups did not differ (P =.965). The severe-GHOA group had more inferiorly inclined glenoids than either the normal (7 ± 6° vs. 12 ± 5°, P =.002) or mild-GHOA groups (14 ± 5°, P ≤.001), but the normal and mild-GHOA groups did not differ (P =.281). Conclusion: Normal and severe-GHOA shoulders differ in critical shoulder angle and glenoid inclination but not acromial offset. The lack of a difference in critical shoulder angle or inferior inclination between mild-GHOA and normal groups calls into question whether inclination and critical shoulder angle differences predate severe GHOA.

Original languageEnglish
Pages (from-to)398-405
Number of pages8
JournalJSES International
Volume5
Issue number3
DOIs
Publication statusPublished - 2021 May
Externally publishedYes

Keywords

  • Cross-Sectional Design
  • Epidemiology Study
  • Etiology
  • Level III
  • Osteoarthritis
  • Radiographic analysis
  • Shoulder replacement
  • Total shoulder arthroplasty

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Surgery

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