Femoroacetabular impingement, labral tears, mimics, and ischiofemoral impingement – A comprehensive imaging review

Femoroacetabular impingement has been described as a distinct clinical entity in the past two decades, and the pathomechanics and imaging findings have been extensively studied in detail. Since it is considered as a major preventable cause of early osteoarthritis in the young population, it is imperative to diagnose this early to prevent irreversible cartilage and labral changes and early joint replacement. This article aims to revisit the imaging findings on radiography, computed tomography scan, and magnetic resonance (MR) imaging for accurate and early diagnosis. The technique for performing and interpretation of MR arthrograms and labral pathology in the context of impingement will be discussed, along with labral variants mimicking pathology. Ischiofemoral impingement and its pathomechanics and imaging will also be discussed.