Objective: The Low Contact Stress (LCS) rotating platform mobile-bearing knee replacement is a leading, worldwide, knee replacement system, but has not been the subject of long-term clinical and/or radiographic follow-up studies evaluating the device in Thailand. The purpose of the present study was to report the 13-year results of a consecutive series of patients who have had primary total knee replacement performed implanting the LCS devices by a single surgeon, Leelasestaporn C.
Material and method: Between May 1999 and December 2002, the author performed 161 consecutive total knee arthroplasties in 138 patients with LCS rotating-platform device by the Ethic Committee approval. All components were cemented. The average age of the patients at the time of operation was 64.67 years old (range 47-84). One hundred twenty two patients (141 knees) were female, and sixteen patients (20 knees) were male. Data analysis was performed retrospectively on the 161 knees (138 patients) that were followed for more than ten years. Kaplan-Meier survivorship curves were generated using revision as the end point. The Knee Society Score (KSS) and range of motion (ROM) were evaluated for clinical assessment and plane radiographs were used to evaluate implant problems.
Results: At the thirteen years follow-up, 101 patients (124 knees) were alive, 13 patients (13 knees) died, and 24 patients (24 knees) were lost to follow-up. Only one patient (1 knee) was revised during this period due to late-infection. The survivorship rate was 99.31% at 13 years for all knees, with an average ROM of 127.08 degrees. The average knee score and function score at end of follow-up were 98.62 and 98.69, respectively.
Conclusion: The LCS system, in Thailand, provides predictable results in tri-compartmental arthritis of the knee, after 13 years follow-up with 99.31% survivorship rate or 100% survivorship rate for aseptic loosening condition and excellent-knee society scores.