Study On Appilication Of Femoral Neck Anteversion In Developmental Dislocation Of The Hip By Digital Anatomy

Objective:Femoral neck anteversion was one of the main and basical pathological changes,normalizing their hip anantomy might prevent or delay the development of osteoarthrosis.This is the concept of reconstrutive osteotomy,in which the primary aim of the surgical treatment is to improve the longterm prognosisof the hip join to discus the femoral neck anteversion of DDH and to guide operating with visual and digitalizing picture in 3DCT and to provide a reasonablo basis of the examination for clinic analyzing 3DCT findings of the DDH.Method:During the past three years(1999.6 -2002.6),thirty children with unilateral DDH had been diagnosed and treated with open reduction,nineteen female patients and eleven male patients,age was ranging from 18 months to 13 years old with an average age of 7.29 years old,six of them were gradeⅡ°and 10 were gradeⅢ°and 14 were gradeⅣ°according to Crowe clasification,were analysed using 3DCT,GE Lightspeed VCT Picker)was used for this study.The femoral condyles were scanned and the 3DCT images were constructed at an independent computer workstation,children that FNA exceed 45°received the subtrochanter osteotomy,images from different direction,FNA of hip were measured respectively before and after operation respectively and were measured in normal and abnormal hips respectively,FNA of hip respectively statistical treatment.30 patients(30 hips) were followed up ranging from 3 months to 2 years with mean 13 months.Result:The bone pathology of DDH included the femoral head and abnormalities of acetabulum,and the congruous relationship between acetabulum and femoral head.FNA abnormality was one of the main elements in the DDH pathology。In group younger than 18 months,the FNA were in normal hips(21.40°±3.512°),in dysplasia hips respectively,the FNA were(68.45°±12.272°),the FNA were measured (20.45°±2.940°) after operation:in group elder than 6 yers,there were significantly statistical differences,the FNA were in normal hips(23.44°±3.561°),in dysplasia hips respectively,the FNA were(73.49°±12.678°),the FNA were measured(18.28°±1.931°) after operation.Clinical assessment was performed according to Mckay'S classification.The satisfactory congruity FNA was achieved in all the cases at the early stage postoperatively.The results showed that.FNA was increased significantly (p＜0.05)as compared with normal group and the overall excellent or good rate was 96.6%.Conclusion:3D-CT method is a new accurate and convenient and reduplicative method for measuring FNA and 3DCT reonstruction techniques can intuitionistic reveal.The change of structure and shape of femoral head and acetabulum.we can get accurate datum of FNA with MPR.It will be more helpful for related operations when three-dimendional images are considered.