Limited-efficacy Testing of SDS and NEMOST for Early Onset Neuromuscular Scoliosis

Inclusion Criteria: * Non ambulant * Neuromuscular or syndromal scoliosis * Progressive scoliosis indicated for bipolar fixation extending to the pelvis * Diagnosis of scoliosis before age 10 * Patient under 12 and open triradiate cartilage (usually closes around 12 years for girls and 14 years for boys) * Main curve proximal end vertebra below Th 3 * Non rigid curve * Patients who have an indication for a primary surgery Exclusion Criteria: * Ambulant * Patients with closed triradiate cartilage * Patients with a skeletal dysplasia that effects growth (Achondroplasia, SED) * Patients with a systemic disease which severely influences bone quality e.g. osteogenesis imperfecta, metabolic diseases * Patients with soft tissue weakness (Ehler Danlos, Marfan, Neurofibromatosis, Prader Willi) * Patients that have a congenital anomaly of the spine of more than 5 vertebrae * Patients with an active systemic disease such as JIA, HIV, oncologic treatment * Patients with a previous surgical fusion of the spine * Patients that are expected to be lost to FU due to e.g. likely to immigrate within 1 year. * Patients that have had a previous spine surgery.