TMJ Internal Derangement: Disc Displacement With vs. Without Reduction

Disc Displacement With Reduction (DDwR)

• Disc displaces anteriorly on opening but recaptures on closing.
• Classic “click” or “pop” during jaw movement.
• Most common TMJ disorder; often intermittent pain.

Disc Displacement Without Reduction (DDwoR)

• Disc remains displaced; no recapture.
• Limited opening (<30 mm), “closed lock.”
• More constant pain, possible headaches, ear symptoms, dizziness.

Management

Conservative first: NSAIDs, soft diet, occlusal splint, physical therapy, stress reduction. Refractory cases may warrant arthrocentesis, arthroscopy, or open joint surgery. Imaging (MRI) confirms disc position.