A posterior leaf spring orthosis (PLSO) is a non-surgical spinal brace used to treat scoliosis, kyphosis, and lordosis. It’s made of plastic and metal components, providing support and correction for spinal deformities. The PLSO works by applying pressure to correct the curvature of the spine and prevent further progression. It’s typically recommended for mild to moderate cases of scoliosis and as a post-operative stabilization after spinal surgery.