Treatment of Ankylosis of Temporomandibular Joint Definition: intra-articular and extra-articular processes may restrict jaw motion severely Ankylosis of the TMJ is an intra-articular process characterized by fibrous, fibro-oSseous, or osseous obliteration (Hs) of the joint space. Extracapsular causes of restricted jaw motion (pseudoankylosis)include but are not limited to coronoid-zygomatic fusion (RA), coronoid hypertropy, and muscular fibrosis1 Treatment of Ankylosis of Temporomandibular Joint Definition:intra-articular and extra-articular processes may restrict jaw motion severely. Ankylosis of the TMJ is an intra-articular process characterized by fibrous, fibro-osseous, or osseous obliteration(消失) of the joint space. Extracapsular causes of restricted jaw motion (pseudoankylosis) include but are not limited to coronoid-zygomatic fusion(融合), coronoid hypertropy, and muscular fibrosis