A 32-year-old man presents with worsening pain in his right hip for 6 months. The pain is localized to the front of the hip, occurs with movement, and is associated with restriction of motion. There is no pain at rest. He also experienced pain in his right knee during the same time period, but without associated swelling or restriction of motion. There is no history of recent trauma. His medical, surgical, and family histories are unremarkable. He is not on any medications, including supplements and over-the-counter medications. He is a heavy drinker, having consumed an average of 3 to 4 units of alcohol per day for around half a decade now. A full blood count is normal. His ESR is 5 mm/1h. A c-reactive protein (CRP) assay is within normal limits.