Do Radiographs Correctly Predict Cam Femoroacetabular Impingement?
) Objective: The MR arthrographic alpha angle has been validated as a tool to diagnose cam femoroacetabular impingement (FAI). This angle is measured on oblique axial images of an MR arthrogram of the hip. However, some morphologic features of the femoral neck on radiographs are thought to reflect FAI. If one could validate radiographic indicators of FAI, radiographs could become a helpful screening tool. The purpose of this study is to determine the accuracy of hip radiographs for predicting cam femoroacetabular impingement (FAI), as determined by the MR arthrogram alpha angle. Materials and Methods: For a previous study, 117 MR arthrograms of the hip had been retrieved from the PACS archive and the FAI alpha angle measured by two musculoskeletal radiologists and one radiology resident by consensus. From this cohort, 69 subjects had radiographs of the same hip. For the current study, these radiographs were assessed by two musculoskeletal radiologists for morphologic appearance of cam
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