A novel hypothesis on the pathogenesis of traumatic temporomandibular joint ankylosis

Abstract

Traumatic temporomandibular joint ankylosis (TTMJA), with its high recurrence rate post-surgery, lacks a unifying pathogenesis theory, hindering effective prevention. We propose a novel four-stage cascade hypothesis that highlights early lymphatic dysfunction—rather than hematoma organization—as a key early determinant of pathological repair. High-energy trauma releases free fibrocartilage fragments into the joint space, where they may act as ’osteogenic seeds’. Subsequent mechanical zonation of the joint into micromotion and stable zones then drives spatially distinct osteogenic pathways (endochondral and intramembranous ossification), explaining the histopathological heterogeneity of the ankylotic mass. This process culminates in piezoelectric-guided vascular fusion and osteoclast-suppressed consolidation, forming a complete bony bridge. Empirically testable in established models, this hypothesis delineates clear therapeutic windows: early intervention targeting lymphatic repair and debris clearance (≤7 days), followed by mechanical modulation (7–21 days), and late osteoclast reactivation (>60 days). This framework reframes clinical management by advocating stage-specific interventions within defined therapeutic windows to shift from reactive surgery to mechanism-based prevention.