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 .
Results of unicompartmental knee arthroplasty at a minimum of ten years of follow-up.
BACKGROUND There is a renewed interest in unicompartmental knee arthroplasty . The present report describes the minimum ten-year results associated with a unicompartmental knee arthroplasty design that is in current use . METHODS Sixty-two consecutive unicompartmental knee arthroplasties that were performed with cemented modular Miller-Galante implants in fifty-one patients were studied prospect ively both clinical ly and radiographically . All patients had isolated unicompartmental disease without patellofemoral symptoms . No patient was lost to follow-up . Thirteen patients ( thirteen knees ) died after less than ten years of follow-up , leaving thirty-eight patients ( forty-nine knees ) with a minimum of ten years of follow-up . The average duration of follow-up was twelve years . RESULTS The mean Hospital for Special Surgery knee score improved from 55 points preoperatively to 92 points at the time of the final follow-up . Thirty-nine knees ( 80 % ) had an excellent result , six ( 12 % ) had a good result , and four ( 8 % ) had a fair result . At the time of the final follow-up , thirty-nine knees ( 80 % ) had flexion to at least 120 degrees . Two patients ( two knees ) with well-fixed components underwent revision to total knee arthroplasty , at seven and eleven years , because of progression of patellofemoral arthritis . At the time of the final follow-up , no component was loose radiographically and there was no evidence of periprosthetic osteolysis . Radiographic evidence of progressive loss of joint space was observed in the opposite compartment of nine knees ( 18 % ) and in the patellofemoral space of seven knees ( 14 % ) . Kaplan-Meier analysis revealed a survival rate of 98.0 % + /- 2.0 % at ten years and of 95.7 % + /- 4.3 % at thirteen years , with revision or radiographic loosening as the end point . The survival rate was 100 % at thirteen years with aseptic loosening as the end point . CONCLUSIONS After a minimum duration of follow-up of ten years , this cemented modular unicompartmental knee design was associated with excellent clinical and radiographic results . Although the ten-year survival rate was excellent , radiographic signs of progression of osteoarthritis in the other compartments continued at a slow rate . With appropriate indications and technique , this unicompartmental knee design can yield excellent results into the beginning of the second decade of use
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 .