Hi Ken ~ The signal loss means that the nerves are being compressed so that the signal isn't being carried from the cord to the legs, the cord to the thoracic, and the cord to the cervical. That is why you feel numbness, weakness, and headaches.
You also have bone spurs in the cervical and the thoracic. Just thought I'd point that out.
God bless and best of luck to you. Take care. Hugs, Lee