Abstract
Background: Femoroacetabular impingement can lead to early osteoarthritis. Diagnosis is primarily radiographic relying on the alpha angle and the anterior offset ratio. There is no clear consensus on how to best diagnose impingement. Methods: This is a retrospective analysis using the alpha angle and anterior offset ratio in the oblique axial and radial planes of 81 preoperative CT scans of patients who underwent hip resurfacing. Results: There were no differences in average alpha angles between image planes. CT was validated for use of these measurements, and the anterior offset ratio was described for the first time in the radial plane using reformatted CT images. Conclusions: More precise methods may be needed to screen for femoracetabular impingent that address issues of sensitivity and variability.
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