The Aspen TLSO is a prefabricated, custom fitted orthosis, constructed of three rigid plastic shells including the rigid posterior panel and two rigid side panels. Together with the padded chest panel, shoulder straps and torso control straps, the Aspen TLSO provides triplanar motion restriction. Requiring several specific anatomical measurements and characterized by a structurally rigid layer of high density polyethylene that encircles the trunk, the Aspen TLSO is designed to be trimmed, bent, molded or modified for use by a specific patient. It is used to stabilize the lower spine (thoracic and lumbosacral) in the case of injury, degenerative spinal conditions, deformities, or corrective surgical procedures and provides anterior-posterior (sagittal plane), medial-lateral (coronal plane), and rotational (transverse plane) control of the lumbosacral spine and lower thoracic spine.