Abstract:Ankylosis means “stiff joints”in greek. Ankylosis of the tmj is an intracapsular union of the disc condylarcomplex to the temporal articular surface that restrict and mandibular movement. Ankylosis may be due to fibrous /bony adhesion between condyle /disc/glenoid fossa and articular eminence that causes inability toopen the mouth beyond 5mm of the interincisal opening due to fusion of the head of the condyle with articular eminence.the management of the ankylosis is to remove the ankylosis mass and create a gap for the free movement of the jaw and to restore the normal esthetic and functional activity. Key word: condylectomy, gap arthroplasty ,interpositional arthroplasty, ankylosis