couple accidents, but really truly, it wasnt determined how. After the neck pain got really bad, I noticed some disfunction, and then it progressively got worse. Once the atrophy showed up, life wasnt so easy. a lot of inversion therapy and traction, it started to subside and improve. Chiro was a waste of time, completely. got one massage, which helped with neck mobility, and lessened pain, but the traction was what really started to change things