Which description best captures bone involvement in sickle cell disease?

• A. Chest: Acute Chest Syndrome
• B. Liver: Hepatomegaly, Scarring, Cirrhosis
• C. Bones: Chronic bone ischemia leading to infection and bone degeneration
• D. Spleen: Infarcts leading to fibrosis and increased risk of infection

Answer: (C)

Bone involvement in sickle cell disease arises from recurrent vaso-occlusion that reduces blood flow to bone tissue. This chronic ischemia causes bone infarcts and osteonecrosis, and with repeated injury the bone undergoes degenerative changes. Over time, these ischemic insults create areas of weakened bone that can become infected and progressively degrade, especially in weight-bearing joints like the femoral head. This combination—persistent ischemia leading to necrosis and subsequent degeneration and infection risk—best describes how bone is affected in sickle cell disease. The other options point to complications in chest, liver, or spleen, which are different organ-specific issues rather than bone pathology.