Traction can help ease the compression of the sciatic nerve, which causes pain radiating down the leg. The spinal canal narrows in spinal stenosis, leading to nerve compression. Traction can alleviate this compression and relieve symptoms. Lumbar traction is the process of applying a stretching force to the lumbar vertebrae through body weight, weights, and/or pulleys to distract individual joints of the lumbar spine. Spinal traction is used to treat herniated discs, sciatica, degenerative disc disease, pinched nerves, and many other back conditions.