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Fig. 8 —29-year-old woman with severe, unrelenting stabbing pain in right hip. Her pain became significantly worse after osteotomy surgery 2 years previously for hip dysplasia. Numerous imaging studies, including MRI, were unrevealing. Musculoskeletal sonography was not available in her region, so she flew from Portland, OR, to Philadelphia, PA, to be examined. Her orthopedic surgeon provided a prescription for sonography but told me, "You won't find anything; that patient is crazy." Axial sonogram at level of iliopsoas muscle (M) shows surgical screw (arrowheads) that has pierced iliac bone and lies deep in relation to iliopsoas tendon (T). Dynamic images (not shown) showed that whenever patient flexed her hip, tendon rubbed against the screw, reproducing her excruciating pain. Screw was surgically removed (by a different orthopedic surgeon), and her stabbing pain immediately resolved.