Sometimes more support or special positioning is needed over and above a regular flat cushion – whether seated in a chair or wheelchair.
Achieving a seated position with hips, knees and ankles at right angles will support best weight distribution, spinal deformities and management of pressure concerns.
The lower portion of the spine, just above the buttocks, naturally curves inward toward the stomach (the lordotic curve). A lumbar back support will help promote good posture by simply filling in the gap between the lumbar spine and the seat, supporting the natural inward curve of the lower back.
Without lumbar back support, it's more difficult to maintain the correct posture—and the lumbar spine and large muscles in the lower back have to work harder to support the proper curvature and alignment. A back cushion may also be recommended to address pelvic and trunk stability to that delivered in the standard wheelchair provision.