This high-yield revision note on TMJ Disorders: Internal Derangement, Ankylosis & Dislocation covers everything examiners typically test under Oral Surgery — structured as quick-reference tables, clinical correlations, mnemonics and previous-year-style high-yield points. It's built for last-mile revision before NEET MDS, INI-CET MDS and INBDE, so you can scan it in minutes instead of re-reading a whole textbook chapter.
| Disorder | Feature | Management |
|---|---|---|
| Disc displacement WITH reduction | Reciprocal click - click on opening (early) AND click on closing (late) | Conservative: soft diet, NSAIDs, occlusal splint therapy |
| Disc displacement WITHOUT reduction (closed lock) | Limited mouth opening, deviation to the affected side, NO click | Physiotherapy first; arthrocentesis if refractory |
| Ankylosis | True (bony, intracapsular fusion) vs False (extra-articular, e.g. from fibrosis/muscle contracture) | Gap arthroplasty ± interpositional material (temporalis fascia, costochondral graft) + aggressive postoperative physiotherapy to prevent recurrence |
| TMJ dislocation | Mandible locked open, unable to close; condyle displaced anterior to the articular eminence | Manual reduction (Hippocratic method) - thumbs on the retromolar area, apply downward then backward-upward pressure |
| Osteoarthritis of TMJ | Crepitus, pain, radiographic flattening/osteophytes | Conservative management; arthroplasty in refractory cases |
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