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 .
Loss of Tibial Bone Density in Patients with Rotating- or Fixed-platform TKA
Little is known about tibial bone remodeling with TKA and its clinical relevance . We performed a r and omized clinical trial to compare tibial bone density changes in cemented components with different bearing design s. Bone density changes were assessed using quantitative computed tomography (qCT)-assisted osteodensitometry . Twenty-eight rotating-platform and 26 fixed-platform cemented TKAs were included . The nonoperated contralateral side was used as a control . CT scans were performed postoperatively and 1 year and 2 years after the index operation . Cancellous bone density loss ( up to 12.6 % at 2 years ) was observed in all proximal tibial regions in both cohorts . In contrast , we found lower cortical bone density loss ( up to 3.6 % at 2 years ) . We found no differences in bone loss between fixed- and rotating-platform implants . The decrease of cancellous bone density after TKA suggests stress transfer to the cortical bone
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 .