Abstract: ObjectiveTo explore the superiority of the screw CT in diagnosing the cerebral palsy complicated with dislocation of hip joint compared with the traditional X-ray.Methods35 patients with cerebral palsy were checked with screw CT and X-ray, and then their Perkin's check, Shenton line and Calve line were individually measured.Results24 cases(68.57%) are half dislocation of hip joint. The abnormalities of Perkin's check, Shenton line and Calve line in hip joint showed in screw CT were respectively compared with X-ray. The statistics shows P<0.05 or <0.01.Conclusions The screw CT is superior to the traditional X-ray in diagnosing the cerebral palsy complicated with dislocation of hip joint and can provide the important anatomy information.

Key words: cerebral palsy, hip joint, screw computer tomography