Total Knee Arthroplasty Using LCS System

Han, Chang Dong; Bae, Im Don; Lim, Dae Eui; Han, Seung Hwan; Lee, Woo Suk

Abstract

PURPOSE: We evaluated the efficiency of low contact stress(LCS) system in total knee arthroplasty by analyzing clinical and radiological results.
MATERIALS AND METHODS
Out of 128 cases who underwent total knee arthroplasty with meniscal bearing type LCS system, eighty one cases who were followed up for more than two years were analysed. Average follow-up period was 32,6 months(24 months-48 months). The diagnoses were six cases of degenerative arthritis, eighteen cases of rheumatoid arthritis, and two cases of avascular necrosis. Clinical analysis were performed by American Knee Society Knee Score and Hospital for Special Surgery(HSS) knee score and radiographic analysis were performed by the Knee Society Roentgenographic Evaluation and Scoring System.
RESULTS
Average preoperative flexion contracture was improved from 13.4 degrees preoperatively to 1.2 degrees at final follow-up and average arc of motion was changed from 107 degrees preopeatively to 108 degrees at final follow-up without significant improvement. American Knee Society Knee Score was improved from average 55.2 preoperatively to 88.5 at final follow-up. HSS knee score also showed improvement from average 58.2 to 86.5. Tibio-femoral angle was improved from 6.3 degrees of varus preoperatively to 5.1 degrees of valgus at final follow-up. Radiolucent lines was seen most commonly at zone 1 in anteroposterior radiograph of tibia and in zone 1 in lateral radiograph of femur. Complications such as superficial wound infection, stiffness, and meniscal bearing fracture were seen in four cases.
CONCLUSION
Total knee arthroplasty using LCS system showed satisfactory improvement in flexion contracture, deformity correction. Clinical and radiographic result.