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

Daniel J Song¹, Nathan S Lanham¹, Rifat Ahmed¹

¹Department of Orthopaedic Surgery, Columbia University Medical Center, New York, NY, USA.

Journal of Shoulder and Elbow Arthroplasty

|November 29, 2023

Summary

This summary is machine-generated.

This study found that pre-operative CT and post-operative radiographs effectively evaluated reverse shoulder arthroplasty (RSA) baseplate position and fixation. Most RSAs showed good component placement with no signs of loosening or radiolucent lines.

Keywords:

3D CT baseplate mimcs radiolucent lines retroversion reverse shoulder arthroplasty

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Area of Science:

Orthopedic surgery
Biomedical imaging
Implantology

Background:

Limited data exists on post-operative component positioning and fixation in reverse shoulder arthroplasty (RSA).
Evaluating baseplate position and fixation is crucial for RSA outcomes.

Purpose of the Study:

To assess baseplate component position and fixation in RSA using pre-operative CT and post-operative radiographs.
To determine the accuracy of radiographic evaluation for RSA component placement.

Main Methods:

Retrospective analysis of 24 primary RSA cases.
Measurement of pre-operative and post-operative glenoid retroversion and inclination using 3D models.
Evaluation of baseplate position and fixation, including assessment for radiolucent lines (RLLs).

Main Results:

Post-operative baseplate retroversion averaged 2±10 degrees, and inclination averaged 3.8±9.1 degrees.
79% of patients had baseplate version within 10 degrees of neutral.
No radiolucent lines or loss of fixation were observed in any patient at an average follow-up of 3.4 years.

Conclusions:

Pre-operative CT and post-operative radiographs are effective tools for evaluating RSA baseplate placement and fixation.
The study demonstrated reliable component positioning and excellent fixation in RSA without signs of loosening.