早期股骨头缺血坏死的CT、MRI诊断

目的探讨X线、CT及低场MRI在诊断早期股骨头缺血坏死中的价值。材料和方法对83例X线疑为早期股骨头缺血坏死的患者行CT及低场MRI扫描，并进行统一分期、Kappa检验和Ridit统计。结果三种检查方法的Kappa一致性检验，K值均大于0.4。Ridit敏感性试验结果为，R(X线)=0.3630；R(CT)=0.5451；R(MRI)=0.5918。结论诊断早期股骨头缺血坏死，低场MRI比CT更具敏感性，X线平片则缺乏诊断意义。对CT尚不能确定的I、Ⅱ期患者，选用低场MRI常规扫描可收到显著的诊断结果。

CT and MRI Diagnosis of Early Avascular Necrosis of Femoral Head

Purpose: To evaluate the value of X-ray plain, CT and low-field MRI in early avascular necrosis of femoral head. Materials and methods: 83 cases of early avascular necrosis of femoral head examed with X-ray plain, CT and MRI were analysed. Stage and Kappa test and Ridit sensitivity determination were completed. Result: All K values were above 0.4, it indicated a good uniformity. Ridit sensitivity defermination showed: (X-ray)=0 3630, (CT)=0 5451, (MRI)=0 5918. Conclusion: In order to diagnose of early avascular necrosis of femoral head, Low-field MRI was superior to CT in early diagnosis avascular necrosis of femoral head. X-ray plain had some limitations for showing early lesion of the desease.