Abstract
Background: Trochlear dysplasia is a significant risk factor for patellofemoral instability. The Dejour classification is currently considered the gold standard for classifying trochlear dysplasia, but numerous studies have reported poor reliability on both plain radiography and MRI. The severity of trochlear dysplasia is important to establish in order to guide surgical management. We have developed an MRI specific classification system to assess the severity of trochlear dysplasia - The Oswestry-Bristol Classification. This is a 4-part classification system comprising Normal, Mild, Moderate and Severe to represent a normal, shallow, flat and convex trochlea, respectively. The purpose of this study is to assess the inter- and intra-observer reliability of the Oswestry-Bristol Classification and compare it with that of the Dejour classification.
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