Abstract
BackgroundBearing dislocation is the main complication after mobile bearing unicompartmental knee arthroplasty. The purpose of this study was to analyze the potential risk factors of bearing dislocation after Oxford phase III mobile bearing unicompartmental knee arthroplasty in Chinese patients.MethodsWe retrospectively investigated 492 patients (578 knees) who underwent Oxford phase III mobile bearing unicompartmental knee arthroplasty in our institution between February 2009 and June 2019. The patients were divided into two groups based on surgeons’ annual surgical volume. Those with/ without bearing dislocation were compared based on patient, surgeon and implant factors.ResultsAmong the 492 patients, 21 (4.3%, 4 men and 17 women) experienced bearing dislocation. Of these, 14 (4.0%) were in the high surgical volume group and 7 (5.1%) were in the low surgical volume group. Multivariate analysis revealed that trauma to the operated leg and daily life involving high knee flexion cumulatively predicted bearing dislocation (p < 0.05).ConclusionsTrauma to the operated leg and daily life involving high knee flexion were risk factors for bearing dislocation after Oxford phase III mobile bearing unicompartmental knee arthroplasty.
Highlights
Bearing dislocation is the main complication after mobile bearing unicompartmental knee arthroplasty
This study investigated the risk factors for bearing dislocation after cemented Oxford Phase III unicompartmental knee arthroplasty (UKA) performed for medial compartment OA in Chinese patients
The patient factors were sex, age, body mass index (BMI), lifestyle with/ without high knee flexion (>120°) and history of trauma directly related to the operated leg
Summary
Bearing dislocation is the main complication after mobile bearing unicompartmental knee arthroplasty. The purpose of this study was to analyze the potential risk factors of bearing dislocation after Oxford phase III mobile bearing unicompartmental knee arthroplasty in Chinese patients. With the development of minimally invasive surgery (MIS), use of unicompartmental knee arthroplasty (UKA) for isolated medial compartment osteoarthritis (OA) has increased [1]. There are two types of UKA implants, the fixed bearing design and the mobile bearing design. The mobile bearing design, called the Oxford UKA, was first used for isolated medial compartment OA in 1982 [3]. Compared with the fixed bearing design, the Oxford UKA has a lower wear rate. The wear rates of Oxford UKA have been reported to be 0.06–1.4 mm per year, lower than those of fixed bearings
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