A spinal orthosis includes posterior panels arranged with a flat spinal curvature to create a reverse three-point pressure system to the spine. The reverse three-point pressure system relieves pressure on the posterior side of the vertebrae beneficial for certain indications. Various arrangements allow for securing the posterior panel to the spinal orthosis. The spinal orthosis includes a belt member length adjustment system including belt members having end portions reducible in length and a belt panel adapted to secure to the end portion of the belt member reduced in length to form at least in part a belt circumference of the spinal orthosis.
