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 UKA compared to fixed bearing TKA: a randomized prospective study.
We prospect ively evaluated a consecutive series of 56 patients with unicompartmental knee arthritis who underwent unicompartmental knee replacement or total knee arthroplasty and received an average of 52months of follow-up . These patients were enrolled in a prospect i ve r and omized clinical trial . There were no significant differences in the pre-operative parameters of both groups . All the patients were followed up and evaluated preoperatively and yearly , the data was collected and statistical analysis was performed . At an average of 52months after surgery the mean Knee Society score was 80.5 ( range : 70 - 100 ) and 78.9 ( range : 70 - 87 ) for Unicompartmental knee replacement and total knee arthroplasty , mean range of postoperative motion for TKA is 115(0)±4(0 ) and 117(0)±7(0 ) for the group of UKA , with the numbers available , the difference between the two groups could not be shown to be significant . The average operation time of UKA and TKA is 68.8min and 81.5min(p<0.01 ) . Blood drainage after operation had a significant difference between the two groups ( p<0.01 ) . Seven cases of UKA were converted to total knee arthroplasty - all of them within the first 2years of starting the procedure and all of them in relatively young patients . From the study we concluded that mobile bearing UKA can obtain similar clinical effect with TKA by surgeons who have the adequate training and experience . After the learning curve UKA should be considered the primary treatment option for unicompartmental knee arthritis
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 .