I go for an ex ray on my lower back and spine on Friday, went to a Chiropractor the other day for treatment, as I have pain in the lower back and on occassions it runs down the leg, not all the time, also have rotator cuff problems, sometimes it bothers me when scrolling, I try to limit myself to fifteen minutes, get up and walk a bit then back to the saw. other then that I'am fine. edward