Analysis Of Early Imaging Prediction Signs Of Type 2 Avascular Necrosis Of The Femoral Head After Ddh Treatment

Objective: This study aimed to analyze the early imaging predictive signs of type 2 avascular necrosis of the femoral head after treatment of developmental dysplasia of hip (DDH). Methods: The 5-year follow-up data of DDH patients treated in our hospital were collected. Among them, 25 cases with type 2 avascular necrosis of the femoral head were taken as the case group, and 30 cases diagnosed with DDH without type 2 avascular necrosis of the femoral head were taken as the control group. The differences in early imaging signs between the two groups were analyzed. Results: The incidence of early influencing signs in the case group was significantly higher than that in the control group (P<0.001), and the incidence of the two types of early imaging signs (distortion of lateral epiphyseal plate and formation of osteopontia) in the case group was significantly higher than that in the control group (P<0.001). Further study on the 25 cases of children in the case group found that the incidence rate of type 2 signs was the highest and had differences with type 3 (P<0.001). The incidence rate of the type 4 signs was the lowest and had differences with type 1 and 2 (P<0.05). The binary logistic regression analysis showed that there was a significant correlation of avascular necrosis of the femoral head in children with distortion of the lateral epiphyseal plate and formation of a bone bridge (OR=9.821, P=0.002). Conclusion: The incidence rate of early imaging signs of avascular necrosis of the femoral head in DDH in children is high, of which the distortion of the lateral epiphyseal plate and the formation and change of a bone bridge are the most common, suggesting that early imaging changes canalert to the occurrence of type 2 avascular necrosis of the femoral head.