I had cervical fusion with bone grafts at C 3-4, C 4-5 and C 5-6 in 2005. Especially in cold weather, I feel and hear what I would describe as expanding and contracting, some clicking or popping. I am told by some that this is fairly normal. My brother had a similar operation and he says it happens. On my last x-ray (for an unrelated matter) I could see the plate and it looks normal. Should I worry?