Background: Children with cerebral palsy (CP) have an increased risk of developing hip dislocation, a painful complication that makes lying, sitting and standing difficult. The CPUP is a national surveillance programme and quality registry with a standardized follow-up of the hips of children with CP. The purpose of this thesis was to provide further information about children with CP who are at risk for hip dislocation, to identify the parameters that contribute to the risk of hip dislocation and to determine how follow-up and treatment can be improved to prevent hip dislocation in children with CP.

Methods: Total populations of children with CP within the CPUP served as study groups in this thesis. Migration percentage (MP) and head-shaft angle (HSA) were measured on radiographs, and age, Gross Motor Function