A 45-year-old woman presents with limited mouth opening to 15 mm, no clicking, and deviation of the jaw to the affected side on opening. She reports that she previously had clicking that resolved spontaneously six months ago. Which type of temporomandibular joint internal derangement best explains this clinical picture?

• A Anterior disc displacement without reduction ✓
• B Anterior disc displacement with reduction
• C Lateral disc displacement
• D Posterior disc displacement

Explanation

Anterior disc displacement without reduction (closed lock) presents with limited mouth opening, absence of clicking, and jaw deviation to the affected side. The history of prior clicking that ceased is characteristic: the disc initially displaced with reduction (clicking) and later became non-reducing, locking the joint. Anterior displacement without reduction is the most common TMJ internal derangement causing closed lock.

Reference: Okeson: Management of Temporomandibular Disorders and Occlusion, 8th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.