Meta-analyses showed no clinical ly relevant differences in terms of revision rates , clinical outcome scores or patient-reported outcome measures between MB and FB TKRs .
It appears that theoretical assumptions of superiority of MB over FB TKR are not borne out in clinical practice
Mobile-bearing ( MB ) total knee replacement ( TKR ) was introduced to reduce the risk of aseptic loosening and wear of polyethylene inserts .
However , no consistent clinical advantages of mobile- over fixed-bearing ( FB ) TKR have been found .
In this study we evaluated whether mobile bearings have an advantage over fixed bearings with regard to revision rates and clinical outcome scores .
Furthermore , we determined which modifying variables affected the outcome .
Early clinical results of a high-flexion, posterior-stabilized, mobile-bearing total knee arthroplasty: a US investigational device exemption trial.
Between May 2001 and June 2004 , 388 total knee arthroplasty cases were enrolled in a prospect i ve , r and omized , multicenter investigational device exemption trial . Patients received either the investigational high-flexion mobile-bearing knee or a fixed-bearing control . At 2 to 4 years of follow-up , results in 293 patients with degenerative joint disease were compared using Knee Society Assessment and Function scores , radiographic results , complications analysis , and survival estimates . The mobile-bearing and fixed-bearing groups demonstrated similar , significant improvement over preoperative assessment s in Knee Scores , maximum flexion , and range of motion . One mobile-bearing arthroplasty required revision . Radiographic results were unremarkable , and implant-related complications were rare in both groups . At this early follow-up , the investigational high-flexion mobile-bearing knee and its fixed-bearing counterpart demonstrated comparable , effective performance
Meta-analyses showed no clinical ly relevant differences in terms of revision rates , clinical outcome scores or patient-reported outcome measures between MB and FB TKRs .
It appears that theoretical assumptions of superiority of MB over FB TKR are not borne out in clinical practice
Mobile-bearing ( MB ) total knee replacement ( TKR ) was introduced to reduce the risk of aseptic loosening and wear of polyethylene inserts .
However , no consistent clinical advantages of mobile- over fixed-bearing ( FB ) TKR have been found .
In this study we evaluated whether mobile bearings have an advantage over fixed bearings with regard to revision rates and clinical outcome scores .
Furthermore , we determined which modifying variables affected the outcome .