[Total shoulder arthroplasty vs. hemiarthroplasty].

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering

Background:

• Shoulder arthroplasty presents challenges due to joint anatomy, despite advancements in implant technology.
• Modern prostheses offer 3D modularity for precise reconstruction of the shoulder's center of rotation.
• Glenoid component fixation remains a complex aspect of total shoulder arthroplasty.

Purpose of the Study:

• To evaluate the initial clinical experience and outcomes of a cup arthroplasty system as an alternative to standard humeral shaft arthroplasty.
• To assess the efficacy of the cup system in patients with rheumatic shoulder, posttraumatic arthrosis, and humeral head necrosis.

Main Methods:

• A clinical trial was conducted between March 1998 and June 1999, implanting 15 shoulder prostheses in 14 patients.
• The cup system was used in 8 rheumatic shoulders, 4 posttraumatic arthroses, and 3 humeral head necroses.
• Follow-up was performed on 13 patients with 14 prostheses.

Main Results:

• The cup arthroplasty system demonstrated significant functional improvement, with the Constant-Score increasing from an average of 23 to 55 points.
• This improvement was observed within a mean postoperative follow-up period of 6.1 months.
• The system eliminates the need for humeral head resection and allows conversion to traditional methods.

Conclusions:

• The cup arthroplasty system is a viable alternative for shoulder joint replacement, offering advantages over conventional methods.
• The system provides significant functional recovery for patients suffering from degenerative and necrotic shoulder conditions.
• Further evaluation is warranted to establish long-term efficacy and patient benefits.