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A 16 year-old Hemophilia A patient is brought to the ED complaining of back pain and unable to move his right hip. The pain started several days ago following a soccer game. On exam the abdomen is unremarkable, and he holds his right hip flexed with a pillow under his thigh. Any attempt at passive or active extension of the hip causes excruciating back pain. Pain is minimal if patient avoids movement. No distal neurologic findings or saddle hypoesthesia are detectable. Lumbar X-ray is insignificant. What is the best next step for this patient?