Abstract
Purpose
The purpose of this study was to evaluate the complications related to the prosthesis design in patients managed with cemented total knee arthroplasty (TKA) with the anterior-posterior glide (APG) mobile bearing prosthesis.
Materials and Methods
One hundred eighty three total knee arthroplasties were performed using APG Low Contact Stress mobile bearing prosthesis (Depuy, Warsaw, IN) on 146 patients with an average of 8.4 years follow-up (range, 7 to 10 years). Patients were evaluated clinically and radiologically according to the American Knee Society clinical scoring system. The anteroposterior translation, anterior soft tissue impingements, and complications were assessed at the follow-up periods.
Results
No knee had loosening and measurable polyethylene wear on radiographs. There were late dislocations of bearing in 2 knees (1.1%), anterior soft tissue impingements in 6 knees (3.3%) at an earlier follow-up, abnormal anteroposterior translation in 5 knees (2.7%), and a fracture of the femoral component induced by osteolysis in 1 knee. Two patients with late dislocation of bearing had preoperative varus deformity more than 15° angulations and 20° flexion contracture.
Conclusion
An improvement in a restraint mechanism of the APG mobile bearing prosthesis is needed to minimize the development of complications with regard to a combination of this design and patient factors.
