Effect of Dysport Injections on Energy Expenditure and Walking Efficiency in Children With Cerebral Palsy

Inclusion Criteria: * Age: 5-17 years. Must be \<18 prior to injection. * \>10 kilograms at screening and injection visits * Diagnosis of spastic diplegia or mild- to moderate spastic quadriplegia Cerebral Palsy * Gross Motor Function Classification System level: I, II, III * Ability to ambulate independently without aid, equinus gait * Absent of joint or bone deformities * Eligible to receive single-event multi-level chemoneurolysis (SEMLC) * Cooperative and tolerant to testing procedures during clinic screening * Presence of spasticity in one or both legs * Be on a stable dose and regimen if on any prescribed medication/s * Parent must have signed written informed consent and the Patient Authorization for Use and Release of Health and Research Study Information Exclusion Criteria: * Ankle contractures no more than -10 degrees with the knee extended * Hemiplegia * Wheelchair dependent * Received Botulinum toxin within previous 4 months * Uncontrolled epilepsy or certain types of seizures * Fracture in the study limb within previous 12 months * Infection or skin disorder at planned injection site * Shortness of breath or other respiratory issues * Uncontrolled clinically significant medical condition * Received phenol or alcohol block in the study limb within previous 6 months * Surgery in the study limb within previous 12 months * Serial casting within previous 12 months * New physiotherapy and/or orthotic regimen \<1 month before study start. (physiotherapy and/or orthot…