Demographic-, Radiographic-, and Surgery-Related Factors Do Not Affect Functional Internal Rotation Following Reverse...

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering

Background:

• Reverse total shoulder arthroplasty (RTSA) is a common procedure for complex shoulder conditions.
• Optimizing functional internal rotation (fIR) is crucial for patient satisfaction and recovery.
• Identifying factors influencing fIR is essential for improving surgical outcomes.

Purpose of the Study:

• To investigate demographic, radiographic, and surgical factors affecting postoperative functional internal rotation (fIR) after RTSA.
• To determine if specific patient characteristics or surgical techniques correlate with improved or diminished fIR.

Main Methods:

• Retrospective cohort study of 42 patients undergoing RTSA with a single implant model.
• Patients were categorized into "IROgood" (good fIR) and "IRObad" (poor fIR) groups based on Constant-Murley score and reach.
• Pre- and postoperative functional status assessed using standardized scores; radiographic parameters and preoperative conditions were evaluated.

Main Results:

• Univariate analysis revealed no statistically significant association between investigated demographic, radiographic, or surgery-related parameters and poor postoperative fIR (p > 0.05).
• All patients received the same implant type, with variations in glenosphere size and neck-shaft angle.
• No specific factors were identified as risk factors for poor fIR in this cohort.

Conclusions:

• None of the evaluated factors, including implant characteristics, demonstrated an influence on postoperative fIR after RTSA in this study.
• The findings suggest that other unmeasured factors may play a role in functional outcomes.
• Further investigation is warranted to elucidate the complex determinants of fIR following RTSA.