After stratification on follow-up time and age , the revision rates were not substantially different , aside for younger patients in short term from studies with short-term follow-up .
Conclusion No essential differences between the two design s were observed .
MB and FB UKA design s have comparable revision rates .
Purpose Two design concepts are currently used for unicondylar knee arthroplasty ( UKA ) prostheses :  fixed bearing ( FB ) and mobile bearing ( MB ) .
While MB prostheses have theoretical advantages over their FB counterparts , it is not clear whether they are associated with better outcomes .
Mobile-bearing lateral unicompartmental knee replacement with the Oxford domed tibial component: an independent series.
The Oxford mobile-bearing unicompartmental knee replacement ( UKR )  is an effective and safe treatment for  osteoarthritis of the medial compartment . The results in the lateral compartment have been disappointing due to a high early rate of dislocation of the bearing . A series using a newly design ed domed tibial component is reported . The first 50 consecutive domed lateral Oxford UKRs in 50 patients with a mean follow-up of three years ( 2.0 to 4.3 ) were included .  Clinical scores were obtained prospect ively and Kaplan-Meier survival analysis was performed for different endpoints . Radiological variables related to the position and alignment of the components were measured . One patient died and none was lost to follow-up . The cumulative incidence of dislocation was 6.2 % ( 95 % confidence interval ( CI ) 2.0 to 17.9 ) at three years . Survival using revision for any reason and aseptic revision was 94 % ( 95 % CI 82 to 98 ) and 96 % ( 95 % CI 85 to 99 ) at three years , respectively . Outcome scores , visual analogue scale for pain and maximum knee flexion showed a significant improvement ( p < 0.001 ) . The mean Oxford knee score was 43 ( SD 5.3 ) , the mean Objective American Knee Society score was 91 ( SD 13.9 ) and the mean Functional American Knee Society score was 90 ( SD 17.5 ) . The mean maximum flexion was 127 ° ( 90 ° to 145 ° ) . Significant elevation of the lateral joint line as measured by the proximal tibial varus angle ( p = 0.04 ) was evident in the dislocation group when compared with the non-dislocation group . Clinical results are excellent and short-term survival has improved when compared with earlier series . The risk of dislocation remains higher using a mobile-bearing UKR in the lateral compartment when compared with the medial compartment . Patients should be informed about this complication . To avoid dislocations , care must be taken not to elevate the lateral joint line
After stratification on follow-up time and age , the revision rates were not substantially different , aside for younger patients in short term from studies with short-term follow-up .
Conclusion No essential differences between the two design s were observed .
MB and FB UKA design s have comparable revision rates .
Purpose Two design concepts are currently used for unicondylar knee arthroplasty ( UKA ) prostheses :  fixed bearing ( FB ) and mobile bearing ( MB ) .
While MB prostheses have theoretical advantages over their FB counterparts , it is not clear whether they are associated with better outcomes .