Extensor mechanism complications following total knee arthroplasty

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering

Background:

• Knee arthroplasty is a common procedure to alleviate pain and restore function.
• Patellar resurfacing is frequently performed during knee arthroplasty, but its impact on the extensor mechanism requires careful consideration.

Purpose of the Study:

• To review the incidence and types of extensor mechanism complications after knee arthroplasty with patellar resurfacing.
• To identify potential contributing factors and patient-specific risks associated with these complications.

Main Methods:

• Retrospective review of 281 knee arthroplasties involving patellar resurfacing.
• Data collected on extensor mechanism complications, surgical technique, and patient factors.
• Mean follow-up period of 42 months.

Main Results:

• A 10% complication rate (28 cases) was observed in the extensor mechanism.
• Complications included quadriceps tendon ruptures, patellar fractures, patellar tendon ruptures, recurring patellar subluxations, patellar pain, and malrotated patella.
• Nine percent of patients required revision surgery.

Conclusions:

• Patellar resurfacing in knee arthroplasty is associated with a notable rate of extensor mechanism complications.
• Surgical technique and patient factors (e.g., rheumatoid arthritis, preoperative valgus deformity) may influence complication occurrence.
• Careful attention to the integrity and vasculature of the extensor mechanism during patellar resurfacing is essential.