To assess the clinical and radiological results of mobile bearing total knee arthroplasty using the LCS system and to analyse complications arising.

From Oct. 1992 to Dec. 1998, 135 cases of total knee arthroplasty was performed using the LCS mobile bearing system. Among those are evaluated 108 cases which were followed up for a mean of 4.8 years (3-9.2 years). Retrospective analysis was done by the clinical and radiological evaluations usinga ROM, tibio-femoral alignment, HSS score and radiological loosening.

The preoperative mean HSS score (58.6) was improved to 89.5 at final follow up. Tibio-femoral angle changed from a varus of 3 ° to a valgus of 5 °. Arc of motion was reduced from 121 ° to 116 ° in osteoarthritis and increased from 111 ° to 118 ° in rheumatoid arthritis. There were 16 cases of osteolysis, but no case provoked clinical problems or more than 4 points in the radiolucent score. Complications were one polyethylene dislocation and one intraoperative tibia plateau fracture.

Mobile bearing knee system showed excellent and predictable clinical and radiological results at a mean 4.8 years follow-up.