Mid‐term results of Oxford phase‐3 medial unicompartmental knee arthroplasty for medial arthritis in Chinese patients

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Currently, the primarily surgical methods of treating unicompartmental knee arthritis include high tibial osteotomy, unicompartmental knee arthroplasty (UKA) and conventional total knee arthroplasty (TKA).1 However, with the increasing concerns regarding the finite life span and post‐operative functional recovery of these aforementioned procedures, the indications for UKA in the treatment of medial osteoarthritis were expanded.2 Moreover, many studies have reported excellent clinical outcomes after UKA, including the reduction of post‐operative pain, the correction of angle deformity, the return of range of motion (ROM) and the improvement of clinical and functional scores.3 As it conserves bone stock better than TKA, UKA also provides patients with better kinesiology and faster recovery.8
Although some studies indicated that the revision rate of UKA is relatively high compared with that of TKA,13 the current long‐term follow‐ups of UKA show good clinical results in Western populations.15 However, differences in knee anatomic structure between the Western population and the Asian population were recently reported.18 Urabe et al.19 found that both the size of the femur and the anterior and posterior condyles are significantly larger in Caucasian females than in Japanese females. In addition, there was a large variation in the offset of the tibial shaft from the tibial plateau among Chinese individuals.18 Furthermore, the lifestyles of those in Asia could result in a higher dislocation rate than the lifestyles of Western populations.24 High knee flexion, from squatting and sitting on the floor, has been a possible causative factor of such dislocation in Asia.26 However, there are few reports on the results of mid‐ or long‐term follow‐up after Oxford phase‐3 UKA in Chinese patients, and the application of Oxford phase‐3 UKA to Chinese populations remains to be investigated.
This retrospective study aimed to evaluate the mid‐term clinical results and revision of Oxford phase‐3 UKA in a small‐volume Chinese centre (the First Affiliated Hospital of Zhejiang Chinese Medical University, Hangzhou, China) throughout a follow‐up period of 5–10 years.
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