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Open Access Research article

The long-term benefit of computer-assisted surgical navigation in unicompartmental knee arthroplasty

Arpad Konyves1*, Charles A Willis-Owen1 and Anthony J Spriggins2

Author Affiliations

1 Sports Surgery and Arthroplasty Fellow, SPORTSMED SA, 32 Payneham Road, Stepney 5069 South Australia

2 Consultant Orthopaedic Surgeon, SPORTSMED SA, 32 Payneham Road, Stepney 5069 South Australia

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Journal of Orthopaedic Surgery and Research 2010, 5:94  doi:10.1186/1749-799X-5-94

Published: 31 December 2010

Abstract

We reviewed the outcomes of 30 consecutive primary unicompartmental knee arthroplasties (UKA) performed by a single surgeon for medial compartmental osteoarthritis. Fifteen Allegretto knees were implanted without computer navigation and 15 EIUS knees were implanted with navigation. We compared the survivorship, radiological and clinical outcomes of the two groups at an average of 8.9 years and 6.9 years respectively. The patients were assessed clinically using the Oxford Knee Score (OKS) and radiologically using long-leg weightbearing films and non-weightbearing computed tomography alignment measurements. The overall survivorship was 86.7% at 9 years. A higher proportion of navigated knees were well aligned with a more reproducible position and malaligned knees tended to have a less favourable OKS. However, we found no statistically significant difference in survivorship, clinical outcome and radiological alignment between the two groups.