Stopped: Failure to recruit
X-rays are the most frequently used imaging test when evaluating the knee for joint replacement. They are non-invasive, safe and cost effective. They allow assessment of: progression of disease, appropriateness for joint replacement, in particular unicompartmental knee replacement (UKR), as well as likely prognosis following replacement. Despite a multitude of standardised views there is a lack of consensus regarding the optimum views to evaluate joint space narrowing within each compartment (lateral, medial and patellofemoral). This study will evaluate the status of knee cartilage in 225 patients with varying degrees, and patterns, of knee osteoarthritis (OA) using standing extension anteroposterior, 15 degrees flexion posteroanterior, 45 degrees flexion posteroanterior and valgus and varus stress views as well as MRI. These results will be compared to the gold standard imaging technique of stress views as well as to direct measurements of retrieved tissue in those patients who undergo knee replacement surgery. The sensitivity and specificity of each of the imaging techniques at predicting suitability for UKR will be calculated, the optimum imaging views proposed, and ultimately the results of this study will be used to develop a decision aid, based on optimum views, to help clinicians decide between likelihood of a patient being a candidate for UKR based on pre-operative X-ray findings.
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Knee Minimum Joint Space Width (Medial and Lateral Compartment)
Timeframe: Day 0