Bony Increased Offset-Reversed Shoulder Arthroplasty (BIO-RSA).

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering

Background:

• Bony increased offset-reversed shoulder arthroplasty (BIO-RSA) is an established method for enhancing the lateralization of the prosthetic center of rotation in reverse shoulder arthroplasty.
• This technique offers a safe and effective approach for improving shoulder biomechanics.

Purpose of the Study:

• To evaluate the efficacy and outcomes of Bony increased offset-reversed shoulder arthroplasty (BIO-RSA).
• To assess the bone graft incorporation and clinical results following BIO-RSA.

Main Methods:

• Preoperative planning involves 3D imaging (CT or MRI) to confirm suitability for BIO-RSA.
• The surgical approach utilizes a standard deltopectoral incision with the patient in the beach-chair position.
• A 29-mm cancellous graft is harvested from the humeral head for glenoid reconstruction, followed by prosthetic implantation.
• Postoperative management and rehabilitation are consistent with standard nonlateralized reverse prostheses.

Main Results:

• In a series of 42 patients with a minimum 2-year follow-up (mean 28 months), glenoid bone graft incorporation was observed in 41 patients (complete) and 1 patient (partial).
• The study indicates successful integration of the bone graft in the vast majority of cases.

Conclusions:

• Bony increased offset-reversed shoulder arthroplasty (BIO-RSA) demonstrates a high rate of glenoid bone graft incorporation.
• The procedure is effective for achieving prosthetic center of rotation lateralization with favorable graft integration in reverse shoulder arthroplasty.