Effect of DBS on Quality of Life in Dyskinetic Cerebral Palsy

Inclusion Criteria: * The treating physician has chosen GPi-DBS for the treatment of the secondary dystonia caused by cere-bral palsy in this patient * Patient and/or legal representative, if the patient is underaged or not capable to give consent himself, have chosen GPi-DBS as treatment * The consent to participate in the trial of the underaged patient, if he is capable to understand the study requirements, is required * Age at enrolment 7-18 years * Diagnosis of secondary dystonia due to cerebral palsy caused by perinatal hypoxic injury * Anti-dystonic pharmacotherapy insufficient (e.g. Jankovic J. Medical treatment of dystonia. Movement disorders, Vol. 28, No. 7, 2013) 67 * Stable anti-dystonic medication over the last 30 days * Globus pallidus internus (pars posterior) and thalamus (motor part) intact on MRI (not older than 2 years - if possible) * No fixed severe skeletal deformations with loss of function, which need immediate orthopaedic surgical intervention * Sufficient compliance of the patient or the legal representative if the patient is underaged or not capable to give consent himself to take part in the study * Informed consent to take part in the study from patient and/or legal representative if the patient is underaged or not capable to give consent himself * Patient and/or legal representative if the patient is underaged or not capable to give consent himself, understands the study requirements and the treatment procedures and provides written informed cons…