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Oxford UKA reliable for 20 years

British study highlights 20-year survival and 10-year clinical results with the implant.

Issue: April 2006

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The Oxford Uni Knee Arthroplasty offers solid clinical results for a decade and is reliable up to 20 years after implantation, according to a British orthopedic surgeon. Unicompartmental knee replacement has several advantages over total knee replacement, researchers said.

Andrew J. Price, FRCS, of Oxford, Oxon, United Kingdom, discussed study results at the American Academy of Orthopaedic Surgeons 73rd Annual Meeting. The study gave 20-year survival results from all medial Oxford meniscal bearing unicompartmental knee arthroplasties performed at one center in Sweden from 1985 and 2004. Prominent Swedish orthopaedic surgeon Ulf Svard, MD, and British surgeons David W. Murray, FRCS; John W. Goodfellow, FRCS; and Christopher Dodd, FRCS, all of Oxford, collaborated on the study.

“Despite the recent increased interest in unicompartmental knee replacement there are few reports of survival and clinical results at and beyond 10 years,” the researchers wrote.

Researchers calculated survival using a lifetable with revision being the endpoint. They used the HHS knee score to collect clinical results from 187 patients who were still living and had undergone revision surgery by 10 years postop, Price said.

The study group included 683 knees in 572 patients. Patients’ mean age at the time of surgery was 69.7 years (ranging from 48 to 94 years).

The patients had undergone 30 revision surgeries: eight for lateral arthrosis, seven for component loosening, three for infection, six for bearing dislocation, one for bearing fracture and five for unexplained pain, Price said.

Patients had repaired ACLs and damaged cartilage, Price said.

Revision survival rates were as follows:

• 10 years: 94.1% (CI 2.9, 237 at risk),
• 15 years: 93.5% (CI 4.6, 101 at risk),
• 20 years: 92.3% (CI 15.1, 11 at risk).

Clinical reviews showed that the mean pre-operative HSS knee score was 57 (95% CI 1). The mean 10-year HSS knee score was 87 (95% CI 1), Price said. Based on HSS criteria, the study results were 68% excellent, 23% good, 6% moderate and 2% poor.

“The results show that this mobile bearing unicompartmental prosthesis offer patients excellent clinical results during the first decade and is durable during the second decade after implantation,” the researchers said. “In addition to the known advantages of unicompartmental over total knee arthroplasty, this device is as reliable up to 20 years.”

Murray, Goodfellow and Dodd are consultants for Biomet.

For more information:

• Price AJ, Murray DW, Goodfellow JW, et al. 20-year survival and 10-year clinical results of the Oxford UNI Knee Arthroplasty. Adult Reconstruction Knee Paper #046. Presented at the American Academy of Orthopaedic Surgeons 73rd Annual Meeting. March 22-26, 2006. Chicago.