Avascular necrosis of the femoral head among children and adolescents with sickle cell disease in Greece.

Hemoglobinopathies are very common in Greece, the incidence of beta-thalassemia trait being 8% and that of sickle cell trait ranging from 1 to 32% in various districts. In Greek populations, sickle cell disease (SCD) is mainly represented by S-beta thalassemia.