Glenoid Component Position Does Not Affect Short-Term Clinical and Radiologic Outcomes in Total Shoulder...

Area of Science:

• Orthopedic surgery
• Biomedical engineering
• Radiology

Background:

• Glenoid component malpositioning is a primary cause of loosening in total shoulder arthroplasty (TSA).
• Understanding the relationship between component position, radiolucency, and clinical outcomes is crucial for improving TSA success rates.

Purpose of the Study:

• To quantify postoperative glenoid component position in TSA patients.
• To investigate the association between glenoid component radiolucency, component position, clinical outcomes, and patient-reported measures at two-year follow-up.

Main Methods:

• A sub-study of a clinical trial involving TSA patients with a minimum two-year follow-up.
• Radiographic assessments measured glenoid component position (version, inclination, offset) and humeral head centering.
• Patient-reported outcome measures (PROMs) and clinical outcomes were collected preoperatively and at two years postoperatively.

Main Results:

• Glenoid component version and inclination significantly improved from preoperative to six weeks postoperative.
• No significant changes were observed in glenoid component offset or humeral head centering throughout follow-up.
• Glenoid radiolucency was present in 17.3% of cases and showed no correlation with component position or PROMs; female gender was a significant variable.

Conclusions:

• Glenoid component position demonstrated significant improvements, particularly inclination, after TSA.
• Humeral head remained well-centered, and glenoid radiolucency was not negatively associated with patient outcomes or component position.
• Female gender emerged as a significant predictor for radiolucency, necessitating further investigation; complications were not linked to glenoid position or radiolucency.