Temporomandibular arthrography was first reported by Nφrgrrad in 1944. Temporomandibular arthrography plays an important role in the diagnosis and management of temporomandibular joint disorders. It can diagnostically detect lesions of the articular disc and other soft tissues within the joint. Abnormal findings of temporomandibular arthrography ① Reproducible anterior displacement of the disc: closed mouth, widened anterior space, posterior edge of the posterior band of the disc is located in the condyle. Open mouth: normal disc-condyle relationship, transverse condylar crest positive band, anterior superior crypt almost disappeared, posterior superior crypt filled and enlarged; ② Irreducible disc anterior displacement closed mouth: same as above, but the anterior gap is wider and the signs of forward displacement of the articular disc are more obvious. Open: condylar motion is restricted. The disc shadow is distorted, the anterior superior saphenous fossa retains contrast, and the posterior superior saphenous fossa is not enlarged. (The anteriorly displaced disc cannot be repositioned and becomes extruded; ③ Lateral displacement (shown on Schuyler’s closed view) External displacement: the external “S” shaped normal shadow of the superior cistern is compressed and thinned; ④ Internal displacement: the contrast image becomes overfilled and widened; ④ Rotational displacement: due to the anterior end of the disc being rotated inward and the posterior end being rotated outward (often with anterior displacement of the disc). Indications ① clinical examination reveals symptoms of joint structural disorders such as joint popping, locking, and marked restriction of condylar motion that require further clarification of the type of change; ② plain film or body layer photography reveals bony changes in the joint or obvious abnormalities in the joint space; ③ clinical examination reveals continuous friction sounds in the joint and suspected disc perforation; ④ observation of the situation after disc repositioning or disc perforation repair; ⑤ diagnosis Temporomandibular arthrography can be performed in the case of intra-articular free bodies or occupying lesions. Contraindications A history of severe iodine allergic reaction and local skin infection of the joint, patients with bleeding disorders and those treated with anticoagulant drugs should not undergo arthrography.