The authors inform about dangerous complications in the children with cerebral palsy-secondary dysplasia, subluxation or luxation of the hip. Among 326 children treated in the Orthopaedic Paediatric Department in Lublin in the years 1993-1996, 67 children had problems with hips. Paralytic hip luxation leads to the loss of walking abilities among many children. The operative reconstruction of the hip luxation is very difficult and does not allow the complete rebuilding of the joint.