Cervical ankylosis refers to spasmodic contraction and pain in the neck muscles caused by stimulation of the nerves innervating the neck muscles, stiffness of the neck, restricted movement, impedance sensation when passively flexing the neck, and inability to keep the jaw close to the chest. Complications of cervical ankylosis: 1. Neurological lesions: This is one of the very common complications for patients with cervical ankylosis. Due to spinal ankylosis and osteoporosis, it is easy to dislocate the cervical vertebrae and fracture the spinal column, causing spinal cord compression; if intervertebral discitis occurs, it causes severe pain, and later it can invade the cauda equina and cause cauda equina syndrome, which leads to neurogenic pain in the lower limbs or buttocks; loss of infection in the sacral nerve distribution area, weakened Achilles tendon reflex and motor dysfunction of the bladder and rectum, etc. 2, serious eye lesions: many patients with cervical ankylosis are not treated in time, inflammation affects the eye and lesions occur. 25% of patients have conjunctivitis, iritis, uveitis or uveitis, the latter can occasionally be complicated by spontaneous anterior chamber bleeding. Iriditis is prone to recurrence and increases in incidence the longer the disease is present, but is not related to the severity of spondylitis; it is common in those with peripheral arthropathy, and a few may precede spondylitis.