In children with cerebral palsy, secondary problems lead to hip dislocation and scoliosis. But There is no definite evidence for the dislocation of hip and scoliosis. The investigators want to verify evidence of scoliosis and dislocation of hip.

Observation cohort study. The investigators will measure for finding evidence by checking the x-ray photograph, hip adductor muscles pressure test and electromyography(EMG test) test of hip adductor and spine muscles

Inclusion Criteria:

• Severe cerebral palsy patients(GMFCS level 3,4,5)
• 2 to 10 years old

Exclusion Criteria:

• Those who disagree with the study.
• other than cerebral palsy.

Serious cerebral palsy children(GMFCS 3,4,5) have secondary problems such as hip dislocation and scoliosis. and There are many preliminary reports that hip dislocation occurs from 2 years of age or older.