The results of Oxford unicompartmental knee arthroplasty in the United States

Abstract

AimsApproved 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 MethodsThis is a single surgeon, retrospective study based on prospectively 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).ResultsSurvivorship 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-operativelyConclusionThis 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.

Outcomes and early revision rate after medial unicompartmental knee arthroplasty: prospective results from a non-designer single surgeon

“…For any new orthopaedic implant, favourable results would be expected from developing centres, and whilst it might be rational to assume that similar outcomes will not be achieved by the wider surgical community, our series forms part of a growing number of independent reports of good results and favourable revision rates [6, 7, 9, 10]. There are also reports from other units with less success [11–14], but the main contrast comes from concerns raised primarily by registry data [30].…”

“…Whilst the initial indications were relatively narrow, increased experience has led to an expansion of potential inclusion criteria, particularly with regard to the level of deformity and disease presence elsewhere in the knee [3–5]. The performance of the Oxford UKA in the wider orthopaedic community has been variable, with units reporting conflicting results, some equally favourable [6–10], and others less so [11–14]. Much of the concern regarding UKA in general has come from the analysis of registry data.…”

Femoral Component Sizing in Oxford Unicompartmental Knee Replacement: Existing Guidelines Do Not Work for Indian Patients

“…Unicompartmental knee replacement (UKR) has proven to be an effective remedy for medial compartment osteoarthritis of the knee [1][2][3][4][5]. Excellent medium and long term results have been published [1][2][3][4][5]. Long term success depends on accurate component alignment and sizing [6,7].…”

Bearing Dislocation and Progression of Osteoarthritis After Mobile-bearing Unicompartmental Knee Arthroplasty Vary Between Asian and Western Patients: A Meta-analysis

“…Fully congruent mobile-bearing UKA was devised to reduce bearing wear [44], one of the important factors affecting the long-term survival of UKA. The Oxford ® Phase III (Zimmer Biomet Ltd, Swindon, UK) UKA is a design of congruent mobile-bearing UKA that has shown excellent long-term results in Europe and the United States [13, 29].…”