Perturbation-Based Balance Training on Trunk Proprioception and Balance in Cerebral Palsy:

Inclusion Criteria: * \- Thirty-eight children hemiplegic cerebral palsy * Age will range as (8:10) years old * Spastic hemiplegic cerebral palsy * Normal body mass index ranged from 1SD to -2SDaccording to BMI-for age Z score charts include an age and sex- specific BMI for children (WHO, 2007). * Gross motor function classification system: level I\&II Exclusion Criteria: * • Difficulty to communicate or to understand program instructions * any other neurological deficits or orthopaedic abnormalities, * secondary musculoskeletal complication * vestibular problems * any mental impairment