Rotator Cuff Dysfunction after Anatomic Total Shoulder Arthroplasty: Who is at Risk?

Area of Science:

• Orthopaedic Surgery
• Biomedical Engineering

Background:

• Total shoulder arthroplasty (TSA) is a common procedure for end-stage shoulder joint disease.
• Cuff dysfunction following TSA can significantly impact patient outcomes.
• Identifying risk factors and early indicators of post-TSA cuff dysfunction is crucial.

Purpose of the Study:

• To compare radiographic and functional outcomes in TSA patients with suspected cuff dysfunction versus a successful TSA control group.
• To investigate correlations between humeral head positioning and cuff dysfunction.
• To identify early indicators of post-TSA cuff dysfunction.

Main Methods:

• Retrospective comparison of 39 TSA patients with suspected cuff dysfunction and 40 matched controls.
• Preoperative and postoperative assessment of radiographic parameters (humeral head height, glenoid radiolucencies) and functional outcomes (range of motion, American Shoulder and Elbow Surgeons score).
• Analysis of correlations between humeral head position and functional deficits.

Main Results:

• Patients with cuff dysfunction showed significantly greater humeral head height and postoperative translations.
• Higher humeral heads correlated with earlier dysfunction and more glenoid radiolucencies.
• Significant deficits in active and passive forward elevation were observed in the dysfunction group.

Conclusions:

• Post-TSA cuff dysfunction leads to worse functional scores, reduced range of motion, and increased glenoid radiolucencies.
• Proper patient selection and accurate humeral head placement are critical for preventing dysfunction.
• Early postoperative forward elevation stiffness may predict cuff dysfunction.