The dystonia test is performed by holding the patient’s limb with both hands and repeatedly performing passive flexion, extension and rotation movements at different speeds and amplitudes, while ensuring that the patient’s muscles are relaxed. If a mild resistance is felt, it indicates that the muscle tone of the limb is increased, and passive movements of each limb joint are performed in the same way, and a comparison of the two sides is required. The muscle tone is mainly to check whether the muscle is tense or relaxed at rest, and an increase in muscle tone indicates a lesion of the conus fasciculus. If the muscle tone is hypotonic or flaccid, it is usually seen in some peripheral nerves, gray matter in the anterior horn of the spinal cord, and cerebellar lesions.