[Inverted arthroplasty of the temporomandibular joint with the posterior segment of the ramus].

With vertical osteotomy of ascending ramus we have performed arthroplasty with inverted posterior segment for 13 cases of true ankylosis. There were 10 cases with more than 2.5 centimeters of Maximum Incisal Opening for more than six months, without open bite secondary to the operation. X-ray examination showed excellent union between the inverted segment and the rest of ramus and satisfactory appearance. There were some advantages of this operative technique; it is easy to operate and is able late the height of the ascending ramus, to form a new TMJ with point to surface contact which is similar to the normal anatomy of TMJ, and help rehabilitate the function of TMJ.