The retrodiscal tissue (bilaminar zone) attaches the back of the temporomandibular joint disc to the temporal bone and condyle. It has an elastic upper layer, a collagen lower layer and loose, highly vascular and innervated tissue in between that fills the space behind the condyle when the jaw opens. When the disc slips forward, the condyle compresses this tissue, making it the main source of TMJ pain.
| Origin | Posterior band of the temporomandibular articular disc |
|---|---|
| Insertion | Tympanic plate and postglenoid process of the temporal bone (upper lamina) and back of the condylar neck (lower lamina) |
The elastic upper lamina pulls the disc back as the mouth closes, while the lower lamina limits forward rotation of the disc. The loose, vascular tissue between them fills the space behind the condyle as it moves forward.
Retrodiscal TMJ tissue inflammation is the dominant source of pain in TMJ internal derangement. When the disc displaces anteriorly, the condyle articulates directly against the retrodiscal tissue (bilaminar zone) rather than the avascular disc, producing marked pain and tenderness. Intra-articular TMJ injection targets the superior joint space to reach the retrodiscal zone. Arthroscopy of the TMJ superior compartment visualises the retrodiscal tissue directly.
Painful inflammation of the retrodiscal bilaminar zone from anterior disc displacement, producing preauricular pain worsened by chewing and jaw opening, managed with occlusal splinting and intra-articular injection.
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