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Mobile-bearing unicompartmental knee replacements (UKRs) with a flat tibial plateau have not performed well in the lateral compartment, owing to a high dislocation rate. This led to the development of the Domed Lateral Oxford UKR (Domed OUKR) with a biconcave bearing. The aim of this study was to assess the survival and clinical outcomes of the Domed OUKR in a large patient cohort in the medium term. We prospectively evaluated 265 consecutive knees with isolated disease of the lateral compartment and a mean age at surgery of 64 years (32 to 90). At a mean follow-up of four years (sd 2.2, (0.5 to 8.3)) the mean Oxford knee score was 40 out of 48 (sd 7.4). A total of 12 knees (4.5%) [corrected] had re-operations, of which four (1.5%) were for dislocation. All dislocations occurred in the first two years. Two (0.8%) were secondary to significant trauma that resulted in ruptured ligaments, and two (0.8%) were spontaneous. In four patients (1.5%) the UKR was converted to a primary TKR. Survival at eight years, with failure defined as any revision, was 92.1% (95% confidence interval 81.3 to 100). The Domed Lateral OUKR gives good clinical outcomes, low re-operation and revision rates and a low dislocation rate in patients with isolated lateral compartmental disease, in the hands of the designer surgeons.

Original publication

DOI

10.1302/0301-620X.96B1.31630

Type

Journal article

Journal

Bone Joint J

Publication Date

01/2014

Volume

96-B

Pages

59 - 64

Keywords

Clinical outcome, Complications, Designer series, Dislocation, Lateral unicompartmental knee replacement, Survival, Adult, Aged, Aged, 80 and over, Arthroplasty, Replacement, Knee, Female, Follow-Up Studies, Hemiarthroplasty, Humans, Knee Dislocation, Knee Joint, Knee Prosthesis, Male, Middle Aged, Prospective Studies, Prosthesis Design, Prosthesis Failure, Reoperation, Treatment Outcome