The purpose of spinal stenosis trials is to study the effectiveness of new treatments for spinal stenosis, which occurs when a spinal nerve root in the lower back (lumbar stenosis) or the spinal cord (cervical stenosis) is "choked" or compressed. During spinal stenosis trials, some patients may get access to new stenosis treatments before they are made available to the public and approved for medical use. Participating in spinal stenosis clinical trials is voluntary.