Axial (A, TE/TR = 25ms/5033ms) and coronal (B, TE/TR = 26ms/4000ms) FSE images, and radiograph (C), in a 33 year-old man status post total hip arthroplasty secondary to traumatic injury demonstrates encasement of the obturator nerve (black arrowheads) within an osseous tunnel (white arrowheads) formed by extensive heterotopic ossification, the extent of which is well appreciated on the concurrent radiograph.