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 .
No difference in quality-of-life outcomes after mobile and fixed-bearing medial unicompartmental knee replacement.
This is a retrospective study comparing the clinical outcomes of mobile vs fixed medial unicompartmental knee replacements . Patients were identified from a prospect ively collected data base .  Demographic data and pre- and postoperative outcomes ( Oxford , Western Ontario and McMaster Universities Osteoarthritis Index , Short Form Health Survey-12 , and satisfaction ) were collected-104 knees ( 90 patients ) with minimum 2-years of follow-up : 37 mobile and 67 fixed-bearing .  At baseline , the median age was 60 years ( mobile ) and 66 ( fixed ) ; body mass index  was significantly higher ( 32 ) for the mobile group than for the fixed ( 28 ) . At follow-up , the groups differed only in the Oxford score : median 83 ( mobile ) and 90 ( fixed ) . There is no difference in outcomes between mobile and fixed unicompartmental knee replacements
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 .