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 results of Oxford unicompartmental knee arthroplasty in the United States
Aims Approved by the Food and Drug Administration in 2004 , the Phase III Oxford Medial Partial Knee is used to treat anteromedial osteoarthritis ( AMOA ) in patients with an intact anterior cruciate ligament . This unicompartmental knee arthroplasty ( UKA ) is relatively new in the United States , and therefore long-term American results are lacking . Patients and Methods This is a single surgeon , retrospective study based on prospect ively collected data , analysing a consecutive series of primary UKAs using the  Phase III mobile-bearing Oxford Knee and Phase III instrumentation . Between July 2004 and December 2006 , the senior author ( RHE ) carried out a  medial UKA in 173 patients ( 213 knees ) for anteromedial osteoarthritis or avascular necrosis ( AVN ) . A total of 95 patients were men and 78 were women . Their mean age at surgery was 67 years ( 38 to 89 ) and mean body mass index 29.87 kg/m2 ( 17 to 62 ) . The mean follow-up was ten years ( 4 to 11 ) . Results Survivorship of the Oxford UKA at ten years was 88 % , using life table analysis . Implant survivorship at ten years was 95 % . The most common cause for revision was the progression of osteoarthritis in the lateral compartment . The mean knee score element of the American Knee Society Score ( AKSS ) was 50 pre-operatively and increased to 93 post-operatively . The mean AKSS function score was 56 pre-operatively rising to 78 post-operatively Conclusion This ten-year follow-up study of the Oxford UKA undertaken in the United States shows good survivorship and excellent function in a wide selection of patients with AMOA and AVN . Cite this article : Bone Joint J 2016;98-B(10 Suppl B):34–40
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 .