Conclusions Although total reoperation rates did not differ in the two population s , reoperation for bearing dislocation was more likely to occur in Asian than in Western patients , whereas reoperation for lateral knee OA progression was more likely to occur in Western than in Asian patients after Oxford Phase III UKA .
Background Implant survivorship is reported to be lower and complications , particularly bearing dislocation , are reported to be more frequent in Asian than in Western patients with medial knee osteoarthritis ( OA ) undergoing Oxford ® Phase III unicompartmental knee arthroplasty ( UKA ) .
To date , however , these complications have not been compared between these groups of patients .
Questions / purpose s The purpose of this study was to perform a meta- analysis comparing the st and ardized incidence rates of ( 1 ) all-cause reoperation ; ( 2 ) reoperation related to bearing dislocation ; and ( 3 ) reoperation related to progression of lateral compartment arthritis in Asian and Western patients with medial knee OA who underwent Oxford Phase III UKA .
The clinical outcome of minimally invasive Phase 3 Oxford unicompartmental knee arthroplasty: a 15-year follow-up of 1000 UKAs.
There have been concerns about the long-term survival of unicompartmental knee arthroplasty ( UKA ) . This prospect i ve study reports the 15-year survival and ten-year functional outcome of a consecutive series of 1000 minimally invasive Phase 3 Oxford medial UKAs ( 818 patients , 393 men , 48 % , 425 women , 52 % , mean age 66 years ; 32 to 88 ) . These were implanted by two surgeons involved with the design of the prosthesis to treat anteromedial osteoarthritis and spontaneous osteonecrosis of the knee , which are recommended indications . Patients were prospect ively identified and followed up independently for a mean of 10.3 years ( 5.3 to 16.6 ) . At ten years , the mean Oxford Knee Score was 40 ( st and ard deviation ( sd ) 9 ; 2 to 48 ) : 79 % of knees ( 349 ) had an excellent or good outcome . There were 52 implant-related re-operations at a mean of 5.5 years ( 0.2 to 14.7 ) . The most common reasons for re-operation were arthritis in the lateral compartment ( 2.5 % , 25 knees ) , bearing dislocation ( 0.7 % , seven knees ) and unexplained pain ( 0.7 % , seven knees ) . When all implant-related re-operations were considered as failures , the ten-year rate of survival was 94 % ( 95 % confidence interval ( CI ) 92 to 96 ) and the 15-year survival rate 91 % ( CI 83 to 98 ) . When failure of the implant was the endpoint the 15-year survival was 99 % ( CI 96 to 100 ) . This is the only large series of minimally invasive UKAs with 15-year survival data . The results support the continued use of minimally invasive UKA for the recommended indications
Conclusions Although total reoperation rates did not differ in the two population s , reoperation for bearing dislocation was more likely to occur in Asian than in Western patients , whereas reoperation for lateral knee OA progression was more likely to occur in Western than in Asian patients after Oxford Phase III UKA .
Background Implant survivorship is reported to be lower and complications , particularly bearing dislocation , are reported to be more frequent in Asian than in Western patients with medial knee osteoarthritis ( OA ) undergoing Oxford ® Phase III unicompartmental knee arthroplasty ( UKA ) .
To date , however , these complications have not been compared between these groups of patients .
Questions / purpose s The purpose of this study was to perform a meta- analysis comparing the st and ardized incidence rates of ( 1 ) all-cause reoperation ; ( 2 ) reoperation related to bearing dislocation ; and ( 3 ) reoperation related to progression of lateral compartment arthritis in Asian and Western patients with medial knee OA who underwent Oxford Phase III UKA .