This study will be conducted to identify the relation between pelvic alignment and standing balance and also the relation between pelvic alignment and selective motor control in children with spastic diplegic cerebral palsy.

In this study, pelvic alignment of children with diplegia will be evaluated using the Formetric instrument system. Their standing balance will be evaluated using the Biodex balance system, while selective voluntary motor control of lower extremities will be assessed using the Selective Control Assessment of the Lower Extremity scale (SCALE).

Results will be compared to find the correlation between pelvic alignment and standing balance and the correlation between pelvic alignment and selective motor control. Results can help clinicians to better address the problems of pelvic asymmetry in children with spastic diplegia to improve their overall balance and functional abilities.

Forty children with spastic diplegia of both sexes will be selected with the following criteria:

Inclusion Criteria:

1. Their age will be ranged from 6 to 8 years.
2. The degree of their spasticity will be ranged from 1 to 1+ according to Modified Ashworth' Scale.
3. They will be on level Ⅰ or Ⅱ on Growth Motor Function Classification System (GMFCS).

Exclusion Criteria:

The Children will be excluded if they have one of the following:

1. Severe visual or hearing impairment.
2. Fixed deformities or surgical interventions in the lower extremities.
3. Botulinum toxin injections in the last 6 months.

Children with spastic diplegia, their height will not be less than 1 meter to meet the requirements of assessment by the Biodex and Formetric systems. They will be able to stand without the use of an assistive device and they will be able to follow instructions and understand given orders.

All IPD that underlie results in a publication will be shared.

The data will be available after completion of statistical analysis of the results.

The data will be shared upon request.