Abstract:

BACKGROUND: To date, the medium-and long-term functional outcome after total knee replacement and the reoperation rate of using the fixed-bearing total knee arthroplasty is same with that of using mobile-bearing total knee arthroplasty, but there are different opinions for the knee function improvement.
OBJECTIVE: To compare the knee joint movement angle after fixed-bearing or mobile-bearing total knee arthroplasty in order to investigate the improvement of joint motion.
METHODS: From January 2005 to December 2012, 90 osteoarthritis patients without operation history were treated by fixed-bearing total knee arthroplasty (n=47) or mobile-bearing total knee arthroplasty (n=43). Both the range of motion of the knee joint before replacement and the femoral angle, the tibia angle, knee valgus angle, tibial plateau posterior slope and patellar height after replacement were measured.
RESULTS AND CONCLUSION: All the patients were followed-up for 4-36 months, and in the final follow-up, the maximum flexion after replacement in the mobile-bearing group was larger than that in the fixed-bearing group, and the difference was not significant (P < 0.05). There was no significant difference of the femoral angle, the tibia angle, knee valgus angle and tibial plateau posterior slope between two groups in the final follow-up (P > 0.05), and there was no significant difference of patellar height between two groups in the final follow-up (P > 0.05). It indicated that both mobile-bearing and fixed-bearing total knee arthroplasty could improve the knee function, and recently study found that the clinical outcomes of mobile-bearing were better than that of fixed-bearing.