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. 2023 Aug 7:7:24715492231192227.
doi: 10.1177/24715492231192227. eCollection 2023.

Surgical Approach for RSA has Little or no Influence on Scapular Inclination and Glenoid Baseplate Tilt Relative to the Horizontal

Thomas Cuinet  1   2   3 , Cécile Nérot  3   4 , Arnaud Godenèche  3   5 , Lisa Peduzzi  1   2   3 ; ReSurg; SoFEC
Collaborators, Affiliations

Surgical Approach for RSA has Little or no Influence on Scapular Inclination and Glenoid Baseplate Tilt Relative to the Horizontal

Thomas Cuinet et al. J Shoulder Elb Arthroplast. .

Abstract

Purpose: Determine whether reverse shoulder arthroplasty (RSA) glenoid baseplate tilt is influenced by surgical approach and/or associated with functional scores.

Methods: In total, 501 shoulders (483 patients) who underwent RSA, by anterosuperior (AS, n = 88) or deltopectoral (DP, n = 413) approach. Preoperative and immediate postoperative anteroposterior and scapular Y-view radiographs were used to measure: Inclination of the supraspinatus fossa's floor relative to the horizontal (Sigma angle), inclination of the glenoid fossa line (or glenoid baseplate surface) relative to the horizontal (beta-h angle) or to the supraspinatus fossa's floor (beta-s angle).

Results: Sigma and beta-h were significantly greater for shoulders operated by DP approach, both preoperatively (P < .001, P = .002) and postoperatively (P = .004, P < .001), but net change was not significantly different (P = .501, P = .742). Conversely, beta-s was significantly greater for shoulders operated by DP approach, only postoperatively (P = .042), but there were no significant differences in either preoperative angles (P = .580) or net change thereof (P = .528).

Conclusion: Beta-s was slightly but significantly greater for shoulders operated by DP approach, while beta-h and sigma depended primarily on preoperative scapular inclination and glenoid tilt, rather than on surgical approach. At a minimum of 2 years following RSA, neither constant scores nor net improvements thereof were significantly associated with any of the angles.

Level of evidence: IV, case series.

Keywords: angles; baseplate; glenoid; reverse shoulder arthroplasty; rotation; scapula; tilt.

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Conflict of interest statement

The authors declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

Figures

Figure 1.
Figure 1.
Flowchart of the study cohort.
Figure 2.
Figure 2.
Sigma angle.
Figure 3.
Figure 3.
Beta-h angle.
Figure 4.
Figure 4.
Beta-s angle.
See this image and copyright information in PMC

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