Abstract:Although femoroacetabular impingement (FAI) is traditionally considered an intra-articular phenomenon, the result of abutment between the femoral head and/or neck and the acetabular rim, there are unique and relatively uncommon patterns of pathologic extra-articular hip impingement that can mimic the clinical presentation and clinical findings of traditional FAI. Anterior inferior iliac spine (AIIS) or “subspine” impingement may occur as a consequence of an abnormally anterior or distal prominence of the AIIS … Show more
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