There are many reports of serious complications during and after spinal manipulation (particularly with cervical spine/neck manipulation). However, the frequency of these events remains controversial and unclear. The most common adverse effect is believed to be local discomfort in the area of treatment, although most concern centers around the less common but potentially life-threatening risks of stroke/vertebral artery dissection, and spinal cord/nerve damage. Deaths have been reported . Some researchers and practitioners blame poor technique, and others believe that the use of high-velocity forceful rotational (twisting) motions of the head increase the risk of serious complications, and suggest using lower-velocity/force non-rotational motion.
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