A 24-year-old woman arrives unable to close her mouth, saliva pooling beneath her chin and panic tightening her voice. She says the problem began after a wide yawn at work; her jaw is fixed forward, and both preauricular areas ache. She can speak, but only in short, muffled phrases. The next move has not yet been made.

— What’s your move? Read on.

Before you read
  • What findings make reduction unsafe without imaging?
  • Which analgesic or sedation strategy is appropriate for this patient?

When to Think of It

  • TMD: preauricular pain, clicking, tenderness, limited opening, pain with chewing, headache, or bruxism.
  • Anterior dislocation: locked open mouth, inability to close, prominent mandibular depression, drooling, and speech difficulty after yawning, eating, trauma, or seizure.
  • Fracture or posterior dislocation: malocclusion, focal bony tenderness, step-off, dental injury, significant trauma, or altered sensation.

Sick or Not Sick

The key call is simple dislocation versus fracture/unstable injury. Image before reduction when there is significant trauma, malocclusion not typical of dislocation, focal mandibular tenderness, deformity, neurologic deficit, or inability to confidently identify an uncomplicated anterior dislocation.

The First Fifteen Minutes

  • Assess airway, secretions, mental status, and ability to cooperate; suction if needed.
  • For uncomplicated painful TMD without dislocation: ibuprofen 600 mg PO once if no renal disease, ulcer, anticoagulation, or pregnancy concern, because prostaglandin inhibition reduces inflammatory pain; add acetaminophen 1,000 mg PO once because central analgesia is opioid-sparing.
  • For an obvious anterior dislocation: provide fentanyl 50–100 mcg IV/IM, titrated to pain, because analgesia reduces guarding; monitor ventilation.
  • If guarding prevents reduction: midazolam 1–2 mg IV, repeat cautiously every 2–5 minutes to a typical total of 2–5 mg, because anxiolysis relaxes masticatory muscles; have airway equipment ready.
  • If procedural sedation is required: propofol 0.5–1 mg/kg IV, then 0.25–0.5 mg/kg increments, because brief deep sedation facilitates muscle relaxation; use continuous capnography and a full sedation setup. Dose varies with age, frailty, and comorbidity—check institutional sedation protocol.
  • Reassess occlusion and facial nerve/sensation after reduction; do not force reduction against resistance when fracture is suspected.

Definitive Care & Disposition

After reduction, confirm normal occlusion and document pre/post neurovascular findings. Soft diet, avoidance of wide opening, and outpatient oral/maxillofacial or dental follow-up are appropriate for uncomplicated cases; a supporting bandage may be used briefly. Fracture, recurrent difficult dislocation, open injury, inability to reduce, airway concern, or significant comorbidity warrants specialist consultation and observation/admission as indicated. Chronic TMD generally receives conservative dental/primary-care management, physical therapy, behavioral modification, and bite-guard evaluation—not emergent surgery.

How This One Kills

The dangerous miss is reducing a mandibular fracture as if it were a simple dislocation, worsening displacement or bleeding. The common cognitive miss is labeling unilateral facial pain “TMD” while overlooking odontogenic infection, temporal arteritis, or cardiac/neuropathic referred pain.
The Differential — What Else Looks Like This
  • Mandibular fracture — malocclusion, step-off, focal tenderness, or trauma; blind reduction can worsen injury.
  • Deep neck/odontogenic infection — fever, toxic appearance, trismus, floor-of-mouth elevation; airway loss may follow delayed treatment.
  • Parotitis — parotid swelling and purulent duct drainage rather than a locked jaw; antibiotics/source control may be delayed.
  • Temporal arteritis — new headache, scalp tenderness, jaw claudication with chewing, and visual symptoms; missed treatment risks blindness.

The Second-Day Story

Older adults may report ear pain, temporal headache, or difficulty chewing rather than “jaw pain,” while a patient with chronic bruxism may have a normal-looking joint but severe muscle tenderness. A dislocation may be partially reduced before arrival, leaving only malocclusion and pain. Examine dental occlusion, palpate the joint and muscles during opening, inspect for infection or trauma, and ask specifically whether the jaw is mechanically locked open or merely painful.
Back to Our Patient
Back to our 24-year-old woman: the locked-open jaw, drooling, and onset after a wide yawn make an uncomplicated anterior TMJ dislocation most likely, with no trauma, focal bony tenderness, or malocclusion suggesting fracture. She receives fentanyl 50 mcg IV, followed by cautious midazolam 2 mg IV because anxiety and muscle spasm prevent cooperation; the jaw reduces smoothly, and normal occlusion returns. After reassessment and oral analgesia, she tolerates fluids, receives soft-diet and limited-opening instructions, and is discharged with dental/oral-maxillofacial follow-up.
Patient Presentation to Attending
How you’d present this patient on the floor — tight, pertinent positives and negatives, no rambling
“This is a 24-year-old woman with sudden inability to close her mouth after a wide yawn, with bilateral preauricular pain and drooling. She has no trauma, seizure, fever, dental pain, or neck swelling, and she can protect her airway. Her mouth is fixed open with anterior mandibular depression, but there is no facial deformity or focal mandibular tenderness. I think this is an uncomplicated anterior TMJ dislocation rather than fracture or infection. I plan IV fentanyl followed by cautious anxiolysis, then gentle reduction with post-reduction occlusion and neurovascular reassessment. If reduction is uncomplicated and she tolerates oral intake, she can discharge with a soft diet and specialist follow-up.”

Study Directive

  • Practice identifying anterior dislocation versus fracture on five clinical vignettes.
  • Review and rehearse one reduction technique on a simulator or with faculty.
  • Memorize the red flags requiring imaging and specialist consultation.
  • Write a discharge plan containing diet, opening restriction, analgesia, recurrence prevention, and follow-up.

Recent Literature

  • Review or guideline Managing Temporomandibular Joint Dislocations
    Gottlieb M, Long B · Ann Emerg Med, 2022 · PMID 35842342 · cited 10×
    Provides an ED-focused approach to diagnosing and reducing acute TMJ dislocation, including analgesia or sedation and post-reduction care.