الفهرس 
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Abstract
Introduction Spontaneous dislocation and subluxation of the hip is one of the important complication of cerebral palsy, occurs in 30-60% in children with cerebral palsy who are walking independent at age of 5 years .The hip joint of cerebral palsy patients is normal at birth but hip dislocation occurs due to delayed motor development which leads to dysplasia, asymmetrical activity of the muscles surrounding the hip and lack of weight bearing which affect bone development The aim of work: The aim of the work in our study is to assess the percentage of hip dislocation and sublaxation in patients of cerebral palsy in Mansoura University Children Hospital with special consideration to factors affecting the hip morphology Research Plan: This study was carried out in Children’s Hospital, Mansoura University in the period from April 2017 to October 2017. This study included 100 cases with spastic CP with age ranged from 3 to 16 years old. Cases were recruited from the outpatient neurology clinics. The research ethics committee of Mansoura Faculty of Medicine approved the study and informed consent was obtained from each child’s parents or legal guidance before enrollment in the study. Results: Hip displacement was found in 39% of CP patients (21% are with hip sublaxation and 18% are with hip dislocation). Both Reimer’s migration percentage and acetabular index has a significant P-value as regard their relation with the grade of hip morphology. The grade of hip deformity is directly proportional with GMFCS and the topographic classification of CP patients. Galeazzi sign and skin fold sign in prediction of unilateral hip dislocation. Physiotherapy plays role in prevention of hip displacement. Conclusion: from this study we concluded that: 1.Hip dislocation was reported in 18% of our studied group and hip sublaxation was reported in 21% of our studied group. 2.Hip dislocation is a common complication in spastic CP. 3.Hip screening is considered a cornerstone in rehabilitation and health maintenance of CP. 4.The incidence of hip dislocation in CP is directly proportional with GMFCS and their topographic classification. 5.Galeazzi sign and asymmetrical inguinal skin fold sign can be used in prediction of unilateral hip dislocation. 6.Antero-posterior X-ray is used in screening of hip displacement in CP patients using Reimers Migration percentage and acetabular index as they are reliable and valid measures. 7.Physiotherapy plays role in prevention of hip dislocation through prevention of progression in muscles spasticity. 8.BoNT-A injection in lower limb muscle has not an effective role in prevention of hip dislocation but only improve hip joint instability and pain.