From what you have described, the likely treatment will be surgery.
For various reason e.g old age, past trauma, the spinal nerves, usually those at the bottom of the spine, are "trapped" by the bony spine, leading to pain, numbness and tingling.
The object of the surgery is to either remove the bony "culprits" (Laminectomy) or widen the spinal canal ( Foraminectomy) or fix the lumbar spine so it cant move ( Spinal fusion) or any combination of all three, depending upon the results of the CT or MRI scan.