A CT based 3D Algorithm for Diagnosis of DDH and Quantification of Surgical Correction

Introduction: Conventional radiographs are not doing justice to the complexity of 3D hip pathologies. Some methods based on 3D technology did not find their way to clinical practice. The goal of this study was to develop a 3D measurement method (named spidermap) for the acetabular coverage that can be used for the diagnosis of DDH as well as for the quantification of correction after Periacetabular Osteotomy (PAO). Methods: In a first step we defined the threshold between physiological and dysplastic hips using this spidermap and in a second step we compared physiological to surgically treated dysplastic hips to quantify the correction. The population included three groups: Group A consisted of 18 physiological, group B of 21 dysplastic and group C of 8 surgically corrected hips. CT scans were used to calculate femoral head