A series of pathological changes in patients with cervical spondylosis, such as protrusion or prolapse of spinal cord, hyperosteogeny of posterolateral facet joints of vertebral body, joint loosening and displacement, can stimulate, pull and compress spinal nerve roots, resulting in reactive edema, root canal stenosis, adhesion of spinal nerve roots to surrounding tissues and finger numbness. Because of the different parts involved, the parts that produce numbness are also different. For example, when the nerve roots of cervical vertebra 6 are involved, the radial side of forearm and thumb are often numb; If the nerve root of the seventh cervical vertebra is involved, the little finger and ring finger can feel numb. From an anatomical point of view, sensory disturbance. In patients with cervical spondylotic radiculopathy, the two often coexist, that is, finger numbness and decreased grip strength. It is only because of the high sensitivity of sensory nerve fibers that the fingers are numb early and the symptoms are particularly obvious.