Background: Osteonecrosis of the femoral head is a frequent complication in adult patients with sickle cell disease. Howeer, little is known about the natural history of asymptomatic lesions.

• 背景：股骨头坏死是成人镰形细胞病患者常见的并发症。但是，我们对于它的非特异性病灶的自然发展过程所知甚少。