Mandi J. Lopez², Megan Swaab¹, Brook Lewis¹, Mark D.Markel¹.
¹University of Wisconsin, Madison,WI, United States, ²Louisiana State University, Baton Rouge, LA, United States

ACVS Abstract 2007

Hip dysplasia is a leading cause of canine and human coxofemoral joint (CFJ) disease. Relationships between canine radiograph measures and humanCT measures with each other and with microstructural cartilage changes in dysplastic canine CFJs were evaluated in this study. Pelvic computed tomography (CT) and radiography were performed.

Orthopedic Foundation for Animals (OFA) and PennHIP reports were obtained for radiographic studies. Norberg angle (NA) and percent femoral head coverage (RPC) were measured on radiographs. Center-edge (CE), horizontal toit externe (HTE), anterior (AASA), posterior (PASA), and horizontal (HASA) acetabular sector angles, acetabular index (AI), and percent femoral head coverage (CPC) were measured on CT slices. Femoral head/acetabular shelf percentage was measured on sagittal (SCT) and transverse (TCT) 3-D CT images.

Cartilage was scored on femoral head and acetabular histology sections. Relationships of OFA confirmation and PennHIP OA scores with radiograph, CT, and cartilage variables and relationships of cartilage scores with radiograph and CT measurements were evaluated with Spearman’s rank correlation. Relationships of distraction index (DI) with radiograph, CT, and cartilage variables were evaluated with Pearson’s correlation.

Significant relationships included PennHIP OA score with cartilage score, AASA, CE, HTE, AI, CPC, and TCT; OFA confirmation score with cartilage score, RPC, NA, AASA, CE, HTE, AI, CPC, and TCT; Cartilage score with RPC, NA, AASA, HASA, CE, HTE, AI, and TCT; and DI with cartilage score, AASA, HASA, CE, HTE, AI, and CPC. Computed tomography may be valuable to quantify canine CFJ disease for clinical and research purposes.