Preoperative MRI and intraoperative arthroscopic images were independently reviewed in a cohort of 24 hips with femoroacetabular impingement with respect to severity and location of chondral, labral, and osseous pathology. Initial calculation of agreement between MRI and arthroscopic findings demonstrated fair to near perfect agreement for the severity of pathology; however, agreement for the location of pathology was highly variable. MR images were subsequently re-scored utilizing the indirect head of the rectus femoris as an anatomic landmark, in accordance with the system used by the operating surgeon, resulting in overall increased agreement across position-dependent variables.
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