Not sure why i still have chronic back pain; been doing physical therapy for 4 months an my low back pain wont go away. got an xray everything looked fine he just said i have some degenrative bone loss in my sacral area. how come im not healing?

If you're not getting sufficient results or information about your chronic back pain, I strongly recommend going to a clinic that specializes in spinal disorders. Appropriate testing will be done and you'll receive the best care & follow-up.

First is key to confirm why you have chronic back pain, as this will allow much more effective treatment to reverse your symptoms. Urge physiatry or osteopathic consult, and perhaps spinal surgeon if necessary.