Long Term Results of LCS Mobile Bearing Knee System in Total Knee Arthroplasty

ABSTRACT

PURPOSE: To evaluate the long-term (over 10 years) clinical and radiologic results of LCS (low contact stress, Depuy, USA) total knee arthroplasty (TKA) retrospectively. MATERIALS AND METHODS: Out of 57 cases who underwent TKA with LCS knee system between June 1994 and August 1995, 33 cases could be analysed clinically and radiographically. Clinical analysis was performed according to flexion contracture, ROM, Knee Society Clinical Rating System (KSCRS) and Hospital for Special Surgery (HSS) score system. Radiographic analysis was performed according to the roentgenographic evaluation criteria of American Knee Society. Complications and survival rate were evaluated. RESULTS: Average flexion contracture was improved from 10.0degrees preoperatively to 3.7degrees at final followup and average ROM was improved from 104.0degrees preoperatively to 115.3degrees at final follow-up (p<0.05). Average HSS score was improved from 49.5 preoperatively to 80.1 at final follow-up and average KSCRS score was also improved from 77.2 to 152.5. Average tibio-femoral angle was changed from 3.3degrees varus preoperatively to 3.5degrees valgus at final follow-up. There were 4 complications, including infection in two cases and fracture dislocation of polyethylene implant in two cases respectively. Ten year survival rate was 94.1 percent. CONCLUSION: LCS TKA showed excellent results and good survival rate at more than ten years followup. However, more cases should be necessary for statistic significance.