Inclusion Criteria:  Confirmed diagnosis of spastic cerebral palsy Aged 4-12 years GMFCS levels I-III (GMFCS = Gross Motor Function Classification Score, expressing the overall functional level of impairment) Sufficient cooperation to comprehend and complete the test procedure Indication for casting of the lower limb  Exclusion Criteria:  Non-ambulatory Botulinum toxin A injections six months prior to enrollment Lower limb surgery two years prior to enrollment Selective dorsal rhizotomy as treatment history Presence of ataxia or dystonia Cognitive problems that impede measurements Severe co-morbidities (severe epilepsy, non-correctable visual impairment, autism spectrum disorders, mental problems that prevent comprehensiveness of the tasks)