Suggest treatment for skin numbness on upper back across cervical vertebrae
many years ago I had a cracker 7th cervical verterbrae - any possible linki or just a coincidence?
Spinal origin most probable.
I read your question carefully and I understand your concern.
I believe that the numbness is related to degenerative changes of your cervical spine. Some degree of degenerative change to the spine happens in most people with age. In your case the cracked vertebrae can have accelerated these changes, not only because of the damage to that vertebrae itself but also possibly to the added strain to the other vertebrae to compensate for the injured one.
As a result there is chronic inflammation of the spinal supporting structures, with irritation of joints and ligaments which when persistent may lead to chronic changes in sensitive structures and permanent sensory abnormalities such as the numbness you describe.
I remain at your disposal for further questions.