We evaluated the clinical results of total knee arthroplasty in 17 cases using the LPS-Flex system in comparison with 22 cases using the NexGen CR system. All knees had osteoarthritis. In the cases using the LPS-Flex system, patients consisting of 3 males and 11 females (mean age: 76.8 years) were follow up postoperatively for 4 to 15 months (mean follow-up: 8.6 months). In the cases using the NexGen CR system, patients consisting of 3 males and 14 females (mean age: 76.9 years) were follow up postoperatively for 9 to 43 months (mean follow-up: 25.9 months). In the cases using the LPS-Flex system, the mean fiexion angle improved from 131.8° to 138.2°, and the mean Japanese Orthopedic Assocciation (JOA) score improved from 51.2 to 86.0 points. There were 10 out of 17 cases (59.0%) which achived flexion of more than 140°. On the other hand, in the cases using the NexGen CR system, the mean reach flexion angle deteriorated from 113.2° to 112.4°, and the mean JOA score improved from 49.5 to 77.0 points. The LPS-Flex system is advantageous in postoperative flexion and has no complications. The short-term results of LPS-Flex system was good.
