Incidence of Radiographic Lateral Compartment Osteoarthritis 15 Years after Medial Unicompartmental Knee Replacement

Description

The presentation begins with Henry Searle introducing the project focused on the long-term incidence of lateral compartment osteoarthritis (OA) following medial unicompartmental knee replacement (UKR). Searle highlights that UKRs have a higher revision rate compared to total knee replacements (TKRs) due to lateral compartment arthritis. The study aims to quantify the incidence of lateral OA over a 15-year period using both revision data and radiographic analysis, particularly measuring joint space width using advanced imaging software.



Patients included in this analysis had undergone cemented phase 3 Oxford UKR by specialized surgeons and were tracked for at least 15 years, examining joint space width and OA progression. The findings show that a small percentage of patients exhibited severe OA, and a notable portion required revision surgeries, particularly among those categorized with severe OA. Gender differences were noted, with females generally presenting a narrower joint space than males.



The study details the methods of radiographic assessment, including the scaling of images and the assessment of joint space width to define the severity of OA. Overall, the findings suggest that while lateral arthritis post-UKR is uncommon, it does exist, and the rates of revision highlight the need for continued monitoring of OA progression following knee surgeries.

DOI: 10.1302/3114-210536

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