Subscapularis Repair During Reverse Total Shoulder Arthroplasty

This multi-site study involving Northwestern Medicine, Beaumont Health, and Loyola Medicine seeks to answer the following question: do patients who undergo subscapularis (SSc) repair during reverse total shoulder arthroplasty (RSA) have better post-operative outcomes than patients who do not undergo SSc repair during RSA? The investigators hypothesize that patients who do not undergo SSc repair during RSA have better post-operative outcomes than patients who undergo SSc repair during RSA. This study will address the controversy surrounding SSc repair during RSA via a multi-institutional randomized controlled trial that will compare clinical outcomes of patients who receive SSc repair during RSA to those who do not.

Patients will undergo standard of care reverse total shoulder arthroplasty. The subscapularis will not be repaired.

To complete reverse total shoulder arthroplasty, the surgeon must cut through the subscapularis muscle. In this arm of the study, the muscle will be repaired, rather than left to heal itself.

PROMIS measures generate T-scores. T-scores are standard scores with a mean of 50 and standard deviation of 10 in a reference population (usually U.S. general population).

Inclusion Criteria: Primary RSA procedure with repairable (intact) SSc Operation will be performed by a participating surgeon using Zimmer Biomet Comprehensive Reverse Shoulder System implant Diagnosis with imaging of arthropathy with rotator cuff insufficiency Surgical approach: Deltopectoral Fluent English speakers/readers Exclusion Criteria: Minor (<18 y/o)/vulnerable populations (pregnant women, prisoners, adults unable to consent) Revision surgery Oncologic surgery non-ZB CRSS implants Unrepairable SSc