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 .
Fixed or mobile bearing unicompartmental knee replacement? A comparative cohort study.
Unicompartmental knee replacement ( UKR ) for anteromedial osteoarthritis is a well-established technique . Numerous clinical outcome studies demonstrate good medium and long-term results . The aim of this prospect i ve study was to compare the complications and short-term clinical outcome of the St. Georg Sled , a fixed bearing UKR , with the Oxford mobile bearing UKR . Outcome at 2 years was assessed using the Bristol knee score and the Oxford knee score ; in addition , complications occurring since formal scoring at 2-year follow-up were recorded . A total of 47 Oxford UKRs and 57 St. Georg Sled UKRs were performed in 91 patients , none of whom were lost to follow-up . At 2 years , both outcome measures were better for the St. Georg Sled Group . The pain component of the Bristol knee score was significantly better for this group ( p-value = 0.013 ) . Three patients in the Oxford group had bearing dislocations and a further four patients required revision ( mean time to revision 3.0 years ) . In the St. Georg Sled group , three patients required revisions ( mean time to revision 3.4 years ) . These results demonstrate that in the short-term , the Oxford mobile bearing prosthesis has a higher re-operation rate and that the St. Georg Sled achieves better pain relief . The functional scores of the two groups were similar
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 .