Abstract
Background: The Press Fit Condylar total knee arthroplasty implant design has been used by many orthopaedic surgeons over the last twenty years. Excellent short-term results with the PFC total knee arthroplasty have been reported previously. The present study represents the clinical and radiographic results of patients who could be followed more than eight years in the PFC total knee arthroplasty.
Methods: Between January 1996 and December 1999, 103 knees in 70 patients after PFC total knee arthroplasty performed by a single-surgeon were analyzed clinically and radiographically. The preoperative diagnosis was degenerative arthritis in all patients. Clinical and radiographic evaluations were performed according to American Knee Society system, American Knee Society Roentgenographic Evaluation and Scoring System. The survival rate was analyzed using the Kaplan-Meier method with the revision arthroplasty cases being counted as a failure.
Results: Average ROM was improved from 102.4° preoperatively to 116.4° at last follow-up and average flexion contracture was improved from 8.3° preoperatively to 1.4° at last follow-up. The average knee and functional score of American Knee Society improved 46.3, 43.2 preoperatively to 89.2, 82.2 at last follow-up. Average tibio-femoral angle was changed from 6.9° varus preoperatively to 4.0° valgus at last follow-up. Radiolucent lines were present in 27.1%(28 cases) on roentgenographic evaluation. Cumulative radiolucency score was 0.8 points and most radiolucent lines were nonprogressive. There were 8 revision surgery performed due to loosening or infection. The survival rate was 96.1% after 8 years when the endpoint was defined as revision arthroplasty.
Conclusions: According to the clinical and radiographic assessments, the mid-term results of PFC total knee arthroplasty were showed excellent results and good survival rate. But the authors considered that more long-term follow-up evaluation should be necessary.
Level of Evidence: Therapeutic III. See Instructions to Authors for a complete description of levels of evidence.
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