
Pain in the right hip that had gradually worsened within the past month prompted a 42-year-old man to seek medical attention. The pain was aggravated by lifting the right leg and by walking; it was relieved by ibuprofen. The patient denied recent trauma, fever, overexertion, numbness, leg weakness, and back pain. He had had a discectomy for a herniated lumbar disk several years earlier. There was no history of sickle cell disease or allergies. He reported occasional alcohol use.

















































































































































































