The more patients with lumbar synostosis have low back and leg pain the more they have to exercise? A: To know whether you can exercise, you have to understand why patients with lumbar synostosis have low back and leg pain? The intervertebral disc is composed of the fibrous ring and the nucleus pulposus, the normal intervertebral disc is a sealed compartment, the fibrous ring wraps the nucleus pulposus tightly, the nucleus pulposus contains many chemical substances, when the fibrous ring cracks, fissures, breaks in serious cases, the chemical substances contained in the nucleus pulposus overflow, or leak out, there is a local chemical inflammation of the back of the disc, if it affects the sciatic nerve, also known as chemical radiculitis, the disc at this time is like a Leaky tire, the more you press, the more gas leaks, the more pain. So, no exercise.