Possible causes of leg weakness after cervical spine surgery include psychosomatic factors, adverse reactions to cervical spine surgery, electrolyte disorders, and anesthetic reactions. 1. Mental and psychological factors: mental stress, nervousness, anxiety, and too much worry about the results of the surgery can lead to weakness of the leg muscles. 2. Adverse reaction of cervical spine surgery: cervical spine surgery is can lead to local nerve, blood vessel and muscle damage, so there will be pain, swelling and other symptoms, so it may show symptoms of muscle weakness. 3. Electrolyte disorders: Cervical spine surgery can lead to electrolyte disorders in the body, resulting in hypokalemia, hypercalcemia, etc., which can lead to leg muscle weakness. 4. Anesthesia reaction: cervical spine surgery requires general anesthesia, the anesthesia drugs need a longer time to be completely metabolized and lose its effect, after cervical spine surgery may be the effect of anesthesia drugs have not completely disappeared, usually after 24 hours can return to normal. After cervical spine surgery, leg weakness occurs, you need to go to the hospital in a timely manner, and examination, identify the cause of the disease for treatment, so as not to delay the condition.