It is caused by contracture of the muscles on one side of the neck (mainly the sternocleidomastoid muscle) or cervical spine diseases such as oculomotor disease. The earlier the treatment, the better the prognosis. If not treated, the patient will have asymmetric deformity of both sides of the face. The etiology of myotonic neck: congenital myotonic neck is caused by contracture and fibrosis of sternocleidomastoid muscle. It is generally believed that the cause is due to abnormal fetal head and neck posture, which hinders the blood circulation of the sternocleidomastoid muscle on one side, resulting in ischemia and contracture of the muscle and causing a squint. Clinical manifestations: Asymmetrical deformity of the face, the distance from the outer corner of the eye to the corner of the mouth on both sides of the face is seen to be shortened on the affected side, and the position of the affected eye is slightly lowered. The head is inclined to the affected side, but the lower jaw protrudes toward the healthy side. The cervical vertebrae gradually develop a lateral bend toward the healthy side, and the healthy side of the face appears more round and full, while the affected side of the face is narrow and flat. If the head is set straight, the sternocleidomastoid muscle on the affected side is tensed like a bowstring, and the asymmetry between the eyes and the face becomes more obvious at this time. Diagnosis of squint: Diagnosis of squint is not difficult, but it should be distinguished from other causes of squint: mainly cervical bony squint (can be distinguished by X-ray examination), visual squint (due to imbalance of extraocular muscles, squint posture can avoid diplopia, no spasm of sternocleidomas), spastic squint (seen in adults, spastic contraction of cervical muscles), etc. Treatment of squint: 1.Non-surgical conservative treatment Early children with mild disease or patients who cannot tolerate surgery can be treated conservatively by massage and manipulation several times a day, turning the child’s head with both hands in the opposite direction of the affected side, and putting a pillow on the shoulder to make the head hang to the healthy side when the child sleeps to traction the contracted sternocleidomastoid muscle. 2.Surgical treatment Applicable to patients with ineffective conservative treatment and heavy deformity Surgical methods: 1.Sternocleidomastoid sternal head and clavicle head severance. Suitable for patients with mild disease. 2.Sternocleidomastoid muscle partial excision, suitable for patients with moderate deformity. 3.Sternocleidomastoid muscle sternal head and clavicular head severance, partial excision, even severing the broad neck muscle, anterior oblique muscle and part of the thickened carotid sheath to completely loosen the neck contracture. This is the most thorough surgical method for patients with recurrent or severe oblique neck after surgical treatment, especially for adult oblique neck. Postoperative treatment: 1. Postoperative pressure bandage and antibiotics to prevent infection for 3-5 days. 2. Tilt the head to the healthy side with a neck brace for 4 weeks after surgery to prevent recurrence.