关键词: 敏感度, 夹角, 特异度, 面积, 股骨头坏死

Abstract: 【Abstract】〓Objective〓Toinvestigate the angle of femoral head necrosis (FHN)/necrosisarea ratio in the prediction of patients with traumatic ischemic necrosis of femoral head in the sensitivity of the collapse of the femoral head and specific degrees. Methods〓Thirty-sevenhips of 31 patients with hip FHN were collected for long-term follow-up, measuring the necrosis area and angle (coronal plane of MRI), using the receiver-operating characteristic curve (ROC) method to evaluate the sensitivity of the patients with femoral head collapse and specific degrees. Results〓Of 37 hips, a total of 11 hips showed collapse of the femoral head (29.7%). Compared with control group (without collapse), the necrosis angle and the necrosis area weresignificant increased (P=0.001,P=0.001), and the angle/area ratio was also significantly greater than that of control group (P<0.001). The area under the curve (AUC) of necrosis angle was 0.772, with 95% confidence interval (CI) was(0.613, 0.932).The area of the corresponding AUC was 0.724, 95% CI (0.516, 0.516), and the corresponding AUC/Angle area was 0.785, 95% CI (0.627, 0.627).Angle, area and Angle/area ratio and femoral head collapse existed significant correlation (P=0.008, 0.019, 0.005, respectively). When the angle/area value was 1.895 (108°/57%), the ratio to predict the sensitivity of the collapse of the femoral head were 97.5% and 98.4%, higher than the corresponding angle of 96.3% and 87.4 and above the area corresponding to 76.4% and 92.5%. Conclusion〓In our study, the necrosis angle was 108° or femoral head necrosis area coverd an area of 57%, it should be highly on guard that femoral head occurred in collapse.Angle/area ratio in the prediction of the sensitivity of the collapse of the femoral head and or specific degrees were superior to angle area of single index.

Key words: Angle, Sensitivity, Specificity, Area, Femoral head necrosis