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Reverse Total Shoulder Arthroplasty
Published on: July 5, 2011
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CT versus MRI planning for reverse geometry total shoulder arthroplasty.
Colton J Bohonos1,2,3, Shane P Russell1,2,4, David I Morrissey1,2,3,4
1University College Cork, Cork, Ireland.
Journal of Orthopaedics
|November 8, 2021
Summary
MRI may be superior to CT for predicting glenoid implant size in reverse total shoulder arthroplasty. This study found MRI more accurate for glenosphere width, with similar accuracy for baseplate screw length, aiding preoperative planning.
Area of Science:
- Orthopedic Surgery
- Radiology
- Biomedical Engineering
Background:
- Preoperative planning for Reverse Total Shoulder Arthroplasty (RTSA) is crucial for successful outcomes.
- Computed Tomography (CT) and Magnetic Resonance Imaging (MRI) are commonly used for preoperative planning.
- Accurate prediction of intra-operative implant sizing is essential for RTSA.
Purpose of the Study:
- To compare the accuracy of pre-operative CT versus MRI in predicting intra-operative glenoid implant sizing for RTSA.
- To evaluate the accuracy of measurements for Glenosphere Width (GW) and Baseplate Central Screw Length (BCSL).
- To assess differences in CT measurement accuracy between trauma and non-trauma cases.
Main Methods:
- Retrospective analysis of 71 datasets from 69 patients undergoing RTSA.
- Preoperative CT or MRI scans were used to predict GW and BCSL by two blinded senior authors.
- Statistical comparison using SPSS v26 between predicted and actual implant sizes.
Main Results:
- MRI predictions were significantly more accurate for Glenosphere Width (82.5%) compared to CT (61.3%) (p=0.045).
- Baseplate Central Screw Length prediction accuracy showed no significant difference between CT (77.4%) and MRI (70%).
- No significant difference in CT measurement accuracy was found between trauma and elective subgroups.
Conclusions:
- MRI may be superior to CT for predicting glenosphere width in elective RTSA preoperative planning.
- MRI demonstrates comparable accuracy to CT for baseplate screw length prediction.
- MRI offers the advantage of visualizing soft tissue anatomy alongside bony measurements, potentially making it the preferred modality for elective RTSA planning.
