To add: I was offered an operation years ago to release the pressure on the nerves in my neck. I was warned there was a 'not insignificant risk of quadriplegia as the surgeon would be working very very close to the spinal column' - I decided trying to live with patchy numbness, occasional muscle spasms (which last days), numb fingers and reduced strength in my hands was the better option. That was a few years ago - a friend, who is currently undergoing similar treatment tells me techniques have improved somewhat but i'm reluctant to risk it.