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. 2023 Nov 7:7:24715492231211122.
doi: 10.1177/24715492231211122. eCollection 2023.

Post-operative Baseplate Radiographic Evaluation Using Routine pre-Operative CT

Daniel J Song  1 , Nathan S Lanham  1 , Rifat Ahmed  1 , Michael L Knudsen  1 , William N Levine  1 , Charles M Jobin  1
Affiliations

Post-operative Baseplate Radiographic Evaluation Using Routine pre-Operative CT

Daniel J Song et al. J Shoulder Elb Arthroplast. .

Abstract

Background: There is limited data evaluating post-operative component position and fixation in reverse shoulder arthroplasty (RSA). Therefore, the purpose of this study was to evaluate baseplate position and fixation using routine pre-operative CT and post-operative radiographs.

Methods: A retrospective analysis of a series consecutive patient who underwent primary RSA was performed. Pre-operative and post-operative glenoid retroversion and inclination were measured using radiographs aligned with projection silhouettes of 3D scapula models in Mimics software. Baseplate retroversion and inclination were measured followed by evaluating for the presence of radiolucent lines (RLLs).

Results: Twenty-four patients met inclusion criteria. The average age was 73.4 ± 10.7 years (range, 45-89 years). Radiographic follow-up was 3.4 ± 1.3 years. Post-operative glenoid baseplate retroversion was 2 ± 10 degrees (range, 30 to -9). Post-operative glenoid baseplate inclination was 3.8 ± 9.1 (range, -13 to 19). Five (21%) RSAs had baseplate retroversion >10 degrees. Follow-up radiographs revealed no RLLs around the baseplate, central post, or peripheral screws in any patient.

Conclusions: Pre-operative CT imaging enabled evaluation of baseplate component placement and fixation on post-operative radiographs. Baseplate version was within 10 degrees of neutral in 79% (19/24) of patients. No RLLs or loss of fixation were found in any cases.

Level of evidence: Level IV: Diagnostic Study.

Keywords: 3D CT; baseplate; mimcs; radiolucent lines; retroversion; reverse shoulder arthroplasty.

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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.
Baseplate version. Measurement of baseplate retroversion (22.6 deg) within the scapular coordinate system of the 3D CT of scapula.
Figure 2.
Figure 2.
Radiograph registration to 3D CT. Radiographs were registered to calculate post-operative position of glenoid baseplate within pre-operative 3D CT of scapula.
See this image and copyright information in PMC

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