This retrospective study of nine cases of TMJ Ankylosis evaluated the postoperative results of interpositional arthroplasty on temporalis muscle and fascia flap in adults. The operative protocol for unilateral TMJ ankylosis entailed (1) resection of ankylotic mass, (2) intraoral ipsilateral coronoidectomy, (3) contralateral coronoidectomy when necessary, (4) interpositional tissue transfer to the TMJ with temporalis muscle, fascia flap, and (5) early mobilization, aggressive physiotherapy. The study evaluated nine patients with follow-up checks from 13 to 31 months (mean 18.3 months)....