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New model of UKA implant shows improved clinical results at 2-year follow-up
Jain RK. HSS J. 2011. doi: 10.1007/s11420-011-9205-4.
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A newer model of unicompartmental knee arthroplasty implant with a cobalt-chromium femoral component and all-polyethylene tibial component appears to yield promising results at a 2-year follow-up, according to researchers in Illinois.
For this study, the investigators looked at 72 patients with intact ligaments who had medial articular cartilage loss and had received the prosthesis. The WOMAC, Knee Society Score (KSS) and standard radiographs were used to gather patient data.
The authors found a 24-point improvement in WOMAC scores for the cohort at the 2-year follow-up, as well as KSS improvement of 33 points. They discovered that mean flexion increased to from 122° to 126° at the 2-year mark. There were no fractures, and one patient demonstrated radiolucency on X-ray. Two of the knees were revised, which the authors attributed to clinical symptoms of pain in the medial compartment.
“Long-term data would be necessary to compare results with [total knee arthroplasty] or other unicompartmental replacements,” the authors wrote.