alexa Intra-operative findings in varus osteoarthritis of the knee
Orthopaedics

Orthopaedics

Journal of Osteoarthritis

Author(s): M A Ritter

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Interest in unicompartmental knee arthroplasty (UKA) for the treatment of medial compartment osteoarthritis has increased in recent years with apparent improvement in the long-term results. This is a result of improved surgical technique, patient selection, and implant design. In an effort further to improve patient selection we analysed the relationship between the pre-operative alignment of the knee and the anatomical findings at the time of surgery. We compared these findings with the indications for UKA. From 4021 total knee arthroplasties we compared intra-operative observations with the pre-operative clinical data in order to identify knees with isolated, medial, compartment changes, which would have been ideal candidates for UKA. We found that only 247 of the knees (6.1%) met anatomical qualifications for isolated, medial, unicompartmental osteoarthritis, and of these, only 168 (4.3%) met clinical standards ideal for UKA. Pre-operative alignment showed a significant relationship with patterns of disease. Logistic regression revealed a relationship between pre-operative alignment and intra-operative findings resembling a Gaussian distribution. Patients with a pre-operative varus alignment of 7° were slightly more likely to be selected for UKA. But the further the anatomical alignment in either direction varies from 7° of varus, the more unlikely it is for the knee to exhibit a disease pattern of isolated, medial, unicompartmental osteoarthritis.

This article was published in The Bone & Joint Journal and referenced in Journal of Osteoarthritis

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