Oxford medial unicompartmental knee arthroplasty - A survival analysis of an independent series

We describe the outcome of a series of 124 Oxford meniscal-bearing unicompa rtmental arthroplasties carried out for osteoarthritis of the medial compar tment. They had been undertaken more than ten years ago in a non-teaching h ospital in Sweden by three surgeons. All the knees had an intact anterior c ruciate ligament, a correctable varus deformity and full-thickness cartilag e in the Lateral compartment. Thirty-seven patients had died; the mean time since operation for the remainder was 12.5 years (10.1 to 15.6). Using the endpoint of revision for any cause, the outcome for every knee wa s established. Six had been revised (4.8%). At ten years there were 94 knee s still at risk and the cumulative survival rate was 95.0% (95% confidence interval 90.8 to 99.3). This figure is similar to that reported by the desi gners of the prosthesis and to the best published results for independent s eries of total knee replacement. If patients are selected appropriately, th is implant is a reliable treatment for anteromedial osteoarthritis of the k nee.