Patellar ligament rupture is an uncommon but devastating complication of total knee arthroplasty. Many predisposing factors may lead to rupture of the ligament during or shortly after surgery. The most common predisposing factor is extensive release of the ligament to improve exposure in difficult cases or revisions. The purpose of this study is to show the outcome of new technique for repair of overstretched patellar ligament during total knee arthroplasty.Background
Purpose
Standard implants (PCL retaining or posterior stabilized types) can be used if soft tissue balancing techniques allow the implant to tension and stabilize the joint in flexion and extension. In severe varus, Greater constraint implant may be used. The indications for the use of these components were inability to balance the knee in both flexion and extension because of severe deformities or intraoperative incompetence of the medial collateral ligament after aggressive release. Fourteen patients with twenty knees had severe varus deformity with average preoperative tibio-femoral angle 25°. The average age was 56 years (from 48 to 64). There was nine males and five females. The pre-operative diagnosis was primary osteoarthritis in 90% of patients and rheumatoid arthritis in 10% (two knees out of twenty). The average follow up was 39 month (from 27 to 57 month). Legacy Constrained Condylar Prosthesis (modular constrained knee of Zimmer) was used in all cases with stemmed both tibial and femoral components.Background
Material and methods
