Clinical Significance And Changes In Femoral Bone Mineral Density Of The Children With Developmental Dislocation Of Hip

Researching background and Objective The developmental dislocation of hip is one of the most common disease in pediatric orthopaedic, treatment for which has experienced a long time of exploration and changes. Reviewing the data of the children with developmental dislocation of hip, we found lateral femoral of parts of children broke in the postoperative period, which seriously affect the limbs function. We measure the bilateral femoral density of 92 children with developmental dislocation of hip pre-surgery,2,4 and 6 months post-surgery. Contrast the change of bone mineral density, and explore the reason of fracture and preventive measures combine with clinicalfeatures.Methods There are 92 children who take the operation of hip open reduction, male 15, female 77, all between 17 and 50 months. Control matched with age,sex, weight and height, choose 15 Healthy Kids as a control group. All children were testified without hepatorenal dysfunction, endocrine disease, musculoskeletal disorders and had not taken medicine which effect on metabolism. The American Norland XR46 bone densitomer system was employed and dual X-ray absorptiometry was used to measure the bilateral femoral density of 92 children with developmental dislocation of hip pre-surgery,2,4 and 6 months post-surgery and mesure the femora] density of 15 children in control group once. When mesured, children took the horizontal position on the examinating couch, take the femoral neck center rectangular area as the test area. Results There were no statistical differences between 15 children in operation group and 15 in control group matched with age, sex, weight and walking age on bilateral femoral density (P>0.05). There were no statistical differences on bone mineral density between bilateral femoral bone of the children in surgical group. All of the 92 cases indicated significant femoral bone mineral density decrease in the surery-involved side 2 months posts-surgery; while they recovered in different degree in 4 months during which the plaster stone and internal plate were removed.Conclusion Disease itself have no more distinct effect on the development of hip and bone mineral density. Trauma due to the operation and immobilization obviously reduce the bone mineral density within two months after operation. The highest incidence of fracture occur in this period. Fracture would have significant negative effects on the joint function. It should raise concern of us to avoid the Frcture.