Similarly , no difference was revealed between the groups for radiological outcomes or general health results .
Controversy exists regarding the clinical and radiological differences in outcomes between  fixed-bearing ( FB ) and mobile-bearing ( MB ) total knee arthroplasties ( TKAs ) at the mid- or long-term follow-up .
We therefore conducted a meta- analysis and systematic review of r and omized controlled trials ( RCTs ) that have evaluated FB and MB TKAs .
Randomized clinical trial of rotating-platform and fixed-bearing total knee arthroplasty: no clinically detectable differences at five years.
BACKGROUND For some surgeons , rotating-platform total knee design s are an intellectually appealing option to use for total knee arthroplasty because of the contention that they can self-align and accommo date small mismatches in the rotational position of the tibial and femoral components . We carried out a r and omized clinical trial to determine if a posterior-stabilized , rotating-platform knee design provided better maximum knee flexion , better function , or better durability at five years of follow-up when compared with a fixed-bearing design . METHODS This r and omized clinical trial of 240 primary total knee arthroplasties involved a single type of distal femoral implant ( posterior-stabilized ) and three different types of tibial implant ( all-polyethylene fixed-bearing , modular-metal-backed fixed-bearing , and rotating-platform ) . The three tibial implant groups were balanced dynamically with a computerized r and omization process that accounted for patient age , sex , and body mass index ; surgeon ; and implant type . Patients returned for examination and radiographs at three months , one year , two years , and five years postoperatively . RESULTS Knee range of motion was not significantly different among the all-polyethylene , modular-metal-backed , and rotating-platform tibial component groups at two years ( mean , 111 ° , 111 ° , and 110 ° , respectively ) or five years ( mean , 110 ° , 109 ° , and 109 ° , respectively ) . Function , as measured with Knee Society scores , was not significantly different among the all-polyethylene , modular-metal-backed , and rotating-platform groups at two years ( mean , 90 , 91 , and 91 points , respectively ) or five years ( mean , 88 , 89 , and 88 points , respectively ) . Stair-climbing scores were not significantly different among the three groups at two years ( mean , 39 , 40 , and 39 points , respectively ) or five years ( mean , 37 , 40 , and 36 points , respectively ) . There were four revisions : one in the all-polyethylene group ( patellar fracture ) , two in the modular-metal-backed group ( aseptic loosening ) , and one in the rotating-platform group ( deep infection ) . CONCLUSIONS In this r and omized clinical trial , the rotating-platform total knee design was reliable and durable but did not provide better maximum knee flexion , better function , or better durability at five years postoperatively when compared with a posterior-stabilized , fixed-bearing design incorporating either an all-polyethylene or a modular-metal-backed tibial component
Similarly , no difference was revealed between the groups for radiological outcomes or general health results .
Controversy exists regarding the clinical and radiological differences in outcomes between  fixed-bearing ( FB ) and mobile-bearing ( MB ) total knee arthroplasties ( TKAs ) at the mid- or long-term follow-up .
We therefore conducted a meta- analysis and systematic review of r and omized controlled trials ( RCTs ) that have evaluated FB and MB TKAs .