A lower back brace can be part of an effective treatment plan for pain relief, support and stabilization. Also referred to as a lumbosacral orthosis (LSO) brace, these may be prescribed by a doctor or purchased over the counter. Functions of the low back, or lumbar area, include structural support, movement, and protection of certain body tissues. Pain in these areas can affect range of motion and day-to-day activities. Bracing can be an effective way to treat these issues.