Conclusion Allergosis treated by steroid disturbed the blood supply of femoral heads, hindered the bone metabolism and reconstruction of necrotic bone, and caused osteonecrosis.

• 结论 激素在治疗变态反应疾病过程中损害了股骨头的血供，抑制了骨组织细胞的代谢，从而抑制了机体对已发生坏死骨组织的修复重建，导致骨坏死发生。