目的 探讨CT和核磁共振诊断股骨头坏死的临床作用。方法 选取2016年12月-2017年12月期间我院收治的骨头坏死 患者分别进行CT和核磁共振诊断，观察CT和核磁共振诊断阳性率及分期结果、早期阳性征象检出率。结果 核磁共 振阳性诊断率97.67%显著高于84.88%的CT检查阳性率(P＜0.05)；CT检查骨髓水肿、骨髓水肿、单一囊变、骨小梁 结构模糊、线样征检出率分别为2.33%、75.58%、9.30%、2.33%显著低于核磁共振的76.74%、100.00%、77.91%、 65.12%(P均＜0.05)。结论　CT和核磁共振检查均具有较好的股骨头坏死的诊断效果，且核磁共振检查阳性检查率 高于CT，还可对股骨头坏死患者相关症状进行诊断，临床应用前景广泛。

Objective To investigate the clinical effect of CT and MRI in the diagnosis of femoral head necrosis. Methods Patients with femoral head necrosis in our hospital from Dec. 2016 to Dec. 2017 were selected and given CT and MRI diagnosis, positive rate, stage result and early positive signs detection rate diagnosed by CT and MRI were observed. Results Positive diagnostic rate of MRI (97.67%) was significantly higher than that of CT (84.88%) (P<0.05), the detection rates of BME, single cystic changes, bone trabecula with blurring structure, string sign by CT were 2.33%, 75.58%, 9.30%, 2.33%, which were significantly lower than those of MRI (76.74%, 100.00%, 77.91%, 65.12%) (P<0.05). Conclusion CT and MRI all have better diagnostic effect in the diagnosis of femoral head necrosis, and the positive diagnostic rate of MRI is higher than that of CT, it can also diagnose the correlative symptoms of patients with femoral head necrosis, and the clinical application prospect is wide.