General Design and Methodology: This is a prospective, multi-center, clinical study to evaluate the use of VEPTR devices for preventing further progression of the Cobb angle, a measure of the curvature of the spine, determined from measurements made on radiographs, allowing for spinal growth and improving pulmonary function in the treatment of children with progressive scoliosis without rib abnormalities. Unilateral vs. Bilateral, and use of an opening wedge thoracostomy, are at the discretion of the surgeon. The treatment would be used regardless of the study, therefore it is routine care. The primary study hypothesis is that, in regard to key clinical and radiographic outcomes, the success rate of the VEPTR device is at least 90%. A secondary study hypothesis is that in regards to key pulmonary outcomes (improvement in pulmonary function tests and increase in lung volume as measured by CT scans), the success rate of the VEPTR device is at least 90% (see Primary Study Endpoints below). Details of the patient outcomes and the study hypothesis are given below. With correction for 10% attrition, 250 patients split between the participating institutions will be enrolled.