The common causes of ankylosis are as follows: 1. There may be abnormal discharge of the nervous system, such as epilepsy, or peripheral nerve stimulation, which may lead to localized ankylosis due to abnormal discharge of the nervous system. 2. It may be due to localized excessive bone proliferation, such as due to localized injuries or inflammation, and there is excessive bone proliferation between the adjacent joints, or even the production of bone bridges, which may lead to ankylosis. 3. If complete ossification occurs inside the joint, it will cause very obvious and serious ankylosis.3. It may be caused by local muscle spasm, for example, the presence of local cold or excessive fatigue, etc., may lead to muscle spasm, which will lead to transient ankylosis of the limb.4. It may also be caused by fasciitis, in the onset of this kind of inflammation, there will be contracture and tension of the fascia, which can also lead to ankylosis. 5. 5, may be due to the surrounding soft tissue calcification, this kind of disease is often due to here have very serious inflammation, or have serious soft tissue injury, in the soft tissue inside a large number of calcium salt deposition, make the joint as well as the surrounding soft tissue stiffness, ankylosis.