I had neck surgery in 2006 and had a disc fusion with screws installed. Since my surgery, I ave lost about 50 lbs. and I am an active bicyclist riding over 80-100 miles a week. In August, I did an event and had neck pain following. After physical therapy, went back to dr and x-rays showed a screw has come out of fusion area. Has anyone had this happen? How do you think it occur? Do you think my cycling had anything to do with it? Any answers would help me out gratly. Thanks in advance.