Computed Tomographic 3D reconstruction of canine hip dysplasia in Labrador Retrievers

Labrador Retrievers with the history of pain in hip joints were assessed for Canine Hip Dysplasia (CHD), which is a complex developmental disorder. Objective of this study was 3D reconstruction and qualitative assessment of Computed Tomographic (CT) scan images of hip joints of dogs with CHD. Radiological and CT evaluation was done in 12 hip joints of 6 Labrador Retrievers. Ventro-dorsal radiographic views of pelvis were obtained and CT scan images were obtained on weight bearing position. Norberg's angle was less than 105^o for 12 hip joints in radiographs. 2D CT images revealed uneven contour of femur head, flat and shallow acetabular rim, and an increased distance between femoral head and acetabulum. 3D reconstruction showed difference in the coverage of femur head inside acetabulum between weight bearing position and ventro-dorsal view. Severe osteoarthritis with periarticular osteophytes, fragmentation of dorsal acetabular margin, irregular surface of femur head and acetabulum were also documented. 3D reconstruction images may be used for designing best fit of hip replacement implant and acetabulum.