LCS mobile bearing knee system in Total Knee Arthroplasty

Choi, HO; Cho, Hyung Lae; Cha, Jae Ryong; Kim, Jin Wan; Ko, Young Chul; Kim, Yoo Dae; Ahn, Su Han

Abstract

PURPOSE: The results of total knee arthroplasties using LCS mobile bearing knee system were analysed clinically and radiologically.
MATERIALS AND METHODS
57 total knee arthroplasties using LCS mobile bearing knee system were per-formed from July, 1995 to Dec.2001. There were 44 female and 10 male patients, and mean age was 66.4 years (41 years to 78 years). There were 55 osteoarthritic knees, and 2 rheumatoid arthritic knees. The average follow up period is 5.4 years (2 years to 8.3 years). ROM, and HSS knee score were analysed to evaluate clinical results. The tibiofemoral angle and radiolucent line were analysed to evaluate radiologic results.
RESULTS
The preoperative mean flexion contracture is 6.8 degree, further flexion is 93.8 degree and HSS knee score is 51.3. The postoperative mean flexion contracture, further flexion and HSS knee score are improved to 2.1 degree, 124.1 degree and 88.4 respectively at final follow up. The mean tibiofemoral angle was improved from varus 5.8 degree to valgus 5.0 degree. The radiolucent lines were found in 2 knees, but the sum of the widths of the radiolucent lines was less than 4mm respectively, and were not classified as loosening. There was 1 post-operative infection case. The infection was treated with arthroscopic irrigation, IV antibiotics and daily irrigation with super oxidized soft water. There was not polyethylene dislocation or failure.
CONCLUSION
LCS mobile bearing knee system showed excellent or good results clinically & radiologi-cally in short term follow up. To evaluate the radiological results of the wear and loosening of total knee arthoplasties using LCS mobile bearing knee system, continuous observation and analysis under the con-dition which excludes the external factor are necessary.