AB103. SOH21AS005. CT versus MRI planning for reverse geometry total shoulder arthroplasty
Orthopaedic Session II

AB103. SOH21AS005. CT versus MRI planning for reverse geometry total shoulder arthroplasty

Colton Bohonos1, Shane Russell2, David Morrissey3

1Brookfield Health Sciences Complex, University College Cork School of Medicine, Cork, Ireland; 2Royal College of Surgeons in Ireland, Dublin, Ireland; 3Department of Trauma and Orthopaedic Surgery, South Infirmary Victoria University Hospital, Cork, Ireland

Background: Preoperative planning for Reverse Total Shoulder Arthroplasty (RTSA) using CT or MRI is well described. We aimed to compare pre-operative CT versus MRI measurement accuracy for predicting glenoid implant sizes.

Methods: All patients with a preoperative CT or MRI undergoing RTSA at our tertiary referral centre from October 2017 to February 2020 were included. Data was collected from theatre and implant registers. Glenosphere Width (GW) and Baseplate Central Screw Length (BCSL) were independently predicted from pre-operative CT or MRI imaging by 2 blinded senior authors. A sub-group analysis was also performed between trauma and non-trauma CT cases. SPSS v26 was used for statistical comparison between predicted and actual implants.

Results: Seventy-one data sets from 69 patients were included for analysis; 31 CT predictions and 40 MRI predictions; 61.3% of CT measured GW predictions were accurate compared to 82.5% of MRI predictions (P=0.045). BCSL predictions were 77.4% and 70% accurate for CT and MRI respectively, without significant difference. There was no significant difference in sub-group analysis for trauma vs. elective CT accuracy of BCSL or GW measurements.

Conclusions: MRI imaging may be superior to CT for predicting GW and no less accurate than CT for predicting BCSL in the elective setting. No difference in CT measurement accuracy was seen between trauma and elective settings. Further study is required to assess MRI accuracy in trauma. While simultaneously clearly defining shoulder soft tissue anatomy, MRI may also be the preferred modality for bony measurements during pre-operative planning for RTSA.

Keywords: Pre-operative imaging; reverse total shoulder arthroplasty (RTSA); pre-operative predictions; proximal humeral fracture; shoulder arthroplasty

Acknowledgments

Funding: None.

Footnote

Conflicts of Interest: The authors have no conflicts of interest to declare.

Ethical Statement: The authors are accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.

Open Access Statement: This is an Open Access article distributed in accordance with the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License (CC BY-NC-ND 4.0), which permits the non-commercial replication and distribution of the article with the strict proviso that no changes or edits are made and the original work is properly cited (including links to both the formal publication through the relevant DOI and the license). See: https://creativecommons.org/licenses/by-nc-nd/4.0/.

doi: 10.21037/map-21-ab103
Cite this abstract as: Bohonos C, Russell S, Morrissey D. SOH21AS005. CT versus MRI planning for reverse geometry total shoulder arthroplasty. Mesentery Peritoneum 2021;5:AB103.

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