We performed temporomandibular joint (TMJ) arthroscopic surgery to treat posterior disc displacement and obtained good results. The patient was a 58-year-old man who presented with masticatory disorders due to open bite in the molar region on October 3, 2001. The patient was given a diagnosis of posterior disc displacement in the right TMJ, and splint therapy and pumping manipulation were performed. Because the symptoms did not subside, the disc was arthroscopically repositioned on November 2. The postoperative clinical course has been good for 6 months, with no jaw movement disorders. Contact has been maintained between the upper and lower molars.
