Analysis On Causes Of Re-dislocation Following Triad-osteotomy In The Patients With Developmental Dislocation Of Hip Joint By Three-dimensional Computed Tomography

Objective:To evaluate the Orthopaedical morphology in children with developmental dislocation of hip(DDH),whose hips were re-dislocated following triad-osteotomy,by three-dimensional computed tomography (3DCT).And to analyse the causes of postoperative dislocation and improve the therapeutic method for DDH. Methods:Twenty-eight children with DDH, whose hips were re-dislocated following triad-osteotomy,were analyzed by some quantitative and qualitative parameter using 3DCT,and compared with some normal ones.Results:The results of Neck shaft angle were respective between the researched group and normal group.The incidence of severely deficient superior acetabulum was respective between the researched group and the successfully-operated group. Conclusion:The causes of re-dislocation following triad-osteotomy were associated with Neck shaft angle and the deficient degree in superior acetabulum rim,etc.