It appears that you have significant degenerative changes in your spine and I recommend you see a neurosurgeon
. You state in your question that you have multilevel thoracic spondylosis, but the only findings that you mention below in the question or lumbar spine findings. It is actually unusual for the thoracic spine to show signs of degeneration first before the lumbar spine, and thus the findings in your MRI are not all that uncommon. The findings that you describe can definitely cause low back pain and the right L5 nerve root compression can cause radiating pain down the right leg. There are a few different ways to approach this problem. The first way is to treat the problem conservatively with physical therapy, medications, and occasionally an epidural steroid injection. This is the best way to handle this issue especially if you are experiencing pain, but are not experiencing weakness or numbness
which are usually signs that a surgical intervention will be needed. Again, a neurosurgeon is the best type of physician to see about this problem. If there is neurological compromise with weakness and numbness, then a lumbar decompression and fusion, or microdiscectomy might be needed to relieve the compression on the nerve and provide you with some relief. A myelogram might be needed prior to surgery
to determine where the procedure must be performed.