The influence of anterior pelvic inclination on osteoarthritis (OA) of the hip joint was investigated. At first, we examined cadaver pelvises radiologically which had various pelvic inclination angles, and confirmed the correlation between the pelvic inclination and the numerical value of radiological measurement. 275 OA of the hip were classified into three groups according to this numerical value. In group 3, which included the cases with the least pelvic inclination, the incidence of OA not due to either acetabular dysplasia or femoral head deformity was higher than the other groups. Furthermore, OA which had destructed the femoral head was observed in 38.8% of the cases in group 3. It was concluded that the pelvic inclination may affect the pathogenesis of OA in the hip joint.
