Purpose To assess the distribution and measure the degree of acetabular dysplasia without advanced degenerative osteoarthritic changes using three-dimensional CT (3DCT). Materials and Methods 46 dysplastic hips of 30 patients were studied. X-ray radiography and 3DCT scan were performed before periacetabular osteotomy. The CE angle of Wiberg, AC angle, ACE angle and AcetAV angle, AASA and PASA were measured on X-ray and 3DCT, respectively. Clinical evaluation was performed according to the Harris hip-scoring...