5.1.5×; 5.2.10×; 5.3.20× (LEICA DM3000.

) The histopathological appearance of the femoral head, processed for routine hematoxylin and stained by eosin, in the ONFH group, which showed trabecular bone fracture and structure disorder, increased trabecular spacing, significantly increased empty bone lacuna, bleeding point of bone marrow necrosis and hyperplasia of fibrous structure. While the normal group and non-ONFH group showed better arranged and more condensed trabeculae compared with the ONFH group. By HE stained histological examination, the incidence of osteonecrosis was 40.4% (19/47).