AB153. SOH25_AB_216. Pilot study: sarcopenia of the deltoid muscle as a predictor of functional outcomes following reverse total shoulder arthroplasty
Orthopaedic Session II

AB153. SOH25_AB_216. Pilot study: sarcopenia of the deltoid muscle as a predictor of functional outcomes following reverse total shoulder arthroplasty

Liam O’Dwyer, Conor Casey, Dave Moore, Robert Gilligan, Martin Davey, Guy Handelman, Tristan Cassidy

Department of Orthopaedic Surgery, University Hospital Limerick, Limerick, Ireland

Background: Sarcopenia is a progressive musculoskeletal disease characterised by loss of muscle mass and strength. Successful reverse total shoulder arthroplasty (RTSA) relies on the muscular function of the surrounding softy tissues, particularly the deltoid. Radiological measures used to quantify sarcopenia including: intramuscular adipose tissue content (IMAC), muscular-cross-sectional area (CSA), and skeletal muscle index (SMI). Our aim is to introduce a novel metric incorporating deltoid CSA as a ratio of a fixed bony landmark to identify those with sarcopenia.

Methods: Patients were split into trauma and elective cohorts. Pre-operative CT scans of 10 trauma and 10 elective patients undergoing RTSA were reviewed using TeraRecon software (TeraRecon Inc., Durham, NC, USA). Four raters (a consultant radiologist, consultant orthopaedic surgeon, radiology registrar, and orthopaedic registrar) took the measurements, and intraclass correlation coefficient (ICC) was calculated. Measurements taken included: deltoid CSA, deltoid Hounsfield units (HU), subcutaneous HU, and glenoid anterior-posterior (AP) diameter. The IMAC and glenoid:deltoid-CSA ratio were calculated.

Results: The glenoid CSA had good agreement between raters for elective cohort vs. moderate agreement in the trauma cohort (ICC: 0.835 vs. 0.625) and good agreement vs. poor agreement respectively for deltoid HU (ICC: 0.881 vs. 0.463). The glenoid AP:CSA ratio had good agreement in the elective cohort vs. moderate agreement in the trauma (ICC: 0.810 vs. 0.624), while the IMAC had good vs. poor agreement respectively (ICC: 0.828 vs. 0.624).

Conclusions: Future objectives included performing a qualitative analysis of disagreements between raters allowing a more consistent methodology for measuring the deltoid in both trauma and elective cohorts.

Keywords: Deltoid; sarcopenia; reverse shoulder arthroplasty; computed tomography; orthopaedics

Acknowledgments

None.

Footnote

Funding: None.

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-25-ab153
Cite this abstract as: O’Dwyer L, Casey C, Moore D, Gilligan R, Davey M, Handelman G, Cassidy T. AB153. SOH25_AB_216. Pilot study: sarcopenia of the deltoid muscle as a predictor of functional outcomes following reverse total shoulder arthroplasty. Mesentery Peritoneum 2025;9:AB153.

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