Total Knee Arthroplasty with a Low Contact Stress Total Knee System

Choy, Won Sik; Kim, Byung Sung; Kim, Ha Yong; Park, Kun Young

Abstract

PURPOSE
To analyze the clinical and radiographic results of LCS total knee arthroplasty patients. MATERIALS AND METHODS: 124 cases were analyzed clinically and radiographically, and were followed up for at least two years. Cases were divided into posterior cruciate retained group (36 cases) and sacrificed group (88 cases), and further divided into a patella resurfaced and unresurfaced group. Several factors such as pain at walking, ROM, H.S.S. score, flexion contracture for clinical evaluation were evaluated and femorotibial angle, radiologic component position, radiolucent zone according to the roentgenographic evaluation of American Knee Society were analysed. RESULTS: Femorotibial angles changed from a varus of 3.9 degrees (1-17 degrees) to a valgus of 7.3 degrees (4-13 degrees). H.S.S. scores were improved from 58.8 (38- 72) to 88.8 (79-99). Flexion contracture was relieved from 12.3 degrees (0-45 degrees) to 1 degrees (0-10 degrees) and further flexion of knee joint increased from 114.4 degrees (30-140 degrees) to 125.6 degrees (90-145 degrees). There was no significant difference in the H.S.S. or ROM scores of the PCL retained and sacrificed group, or between the patella resurfaced group and the unresurfaced group. There was no cases of complete radiolucency, no osteolysis and no component position change. CONCLUSION: According to the clinical and radiologic assessments, total knee arthroplasty using the LCS(R) system showed satisfactory clinical and radiographic results and no significant difference was observed between the PCL retained and sacrificed groups.