A Cohort Study in Iran: Mobile-Bearing-Versus Fixed-Bearing Total Knee Arthroplasty: Are These the Same?

Application of fix-bearing-(FB) or mobile-bearing (MB) total knee arthroplasty (TKA) is an area of controversy. Introduction of mobile-bearing implants has become an appealing option for some surgeons leading to more favorable structural and weight-bearing outcomes in TKA; however, the beneficial long-term outcome is still unclear. This study was carried out to compare TKA outcomes by MB-versus FB implants with respect to long-term outcome. A total of 140 patients who met our inclusion criteria were enrolled in this retrospective cohort study from March 2015 to April 2016. They were divided into two groups of 85 patients with MB TKA and 55 subjects with FB TKA. The range of motion (ROM), knee injury and osteoarthritis outcomes score (KOOS), and patient satisfaction were compared between two groups. The ROM and KOOS scores were not significantly different between the two groups (P > 0.05). With regard to the patient’s satisfaction, there was no significant difference between the two groups (P > 0.05). According to our results in this retrospective cohort study, regarding the outcome of TKA by MB versus FB implants, we showed comparable mechanical and functional outcome.