Constrained total elbow arthroplasty

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering
• Reconstructive Surgery

Background:

• The development of constrained hinge elbow prostheses is crucial for managing severe elbow instability and arthritis.
• Early designs faced challenges with loosening and limited range of motion.
• The condylar-sparing design aimed to improve fixation and preserve native anatomy.

Purpose of the Study:

• To evaluate the long-term clinical outcomes of a condylar-sparing constrained hinge elbow prosthesis.
• To assess implant survivorship, pain relief, and functional range of motion.
• To analyze reasons for implant removal.

Main Methods:

• A condylar-sparing constrained hinge elbow prosthesis with a high-density polyethylene bushing was designed in 1972.
• Humeral component fixation utilized intercondylar and intramedullary methods with methylmethacrylate cement.
• Muscle and collateral ligament reattachment to preserved condyles was performed for enhanced stability.

Main Results:

• Clinical experience over 16 years in 42 elbows showed a low loosening rate of 7%.
• Three implants were removed: one for infection, one for fracture, and one for loosening.
• Follow-up in 31 elbows (27 patients) demonstrated excellent pain relief and average range of motion: 129° flexion, -44° extension, 69° pronation, 61° supination.

Conclusions:

• The condylar-sparing constrained hinge elbow prosthesis offers durable clinical results with good functional recovery.
• The implant design facilitates stable fixation and preserves important anatomical structures.
• Long-term follow-up confirms the efficacy of this prosthesis in managing complex elbow conditions.