Residency · Residency · Otolaryngology
Laryngeal Trauma: Blunt and Penetrating
Introduction
Laryngeal trauma is an uncommon but potentially life-threatening injury affecting the airway, voice, and swallowing function. It may result from blunt mechanisms (motor vehicle accidents, clothesline injuries, strangulation, sports) or penetrating mechanisms (stab wounds, gunshot wounds). Prompt recognition and appropriate airway management are critical, as delayed diagnosis increases morbidity and the likelihood of poor functional outcomes.
Anatomy
Laryngeal Framework
Thyroid cartilage: shield-shaped; protects the vocal folds; fractures most commonly at the midline or paramedian. Cricoid cartilage: complete cartilage ring; only complete ring in the airway; fracture compromises airway patency. Arytenoid cartilages: paired; control vocal fold movement via the cricoarytenoid joints. Epiglottis: elastic cartilage; deflects food from the airway. Hyoid bone: not technically cartilage; supports the supraglottis; fracture seen in strangulation.
Key Internal Structures
Vocal folds: true folds at the level of the thyroid cartilage. Anterior commissure: where the vocal folds meet anteriorly; critical for voice. Recurrent laryngeal nerve (RLN): enters the larynx at the cricothyroid joint; motor to all intrinsic muscles except the cricothyroid. Cricothyroid membrane: site for emergent cricothyrotomy.
Mechanism of Injury
Blunt Trauma
Motor vehicle accidents: steering wheel or dashboard impact to the anterior neck. Clothesline injuries: cord or wire striking the neck at speed. Strangulation/hanging: compression of the larynx against the cervical spine. Sports injuries: direct blow to the anterior neck. The thyroid cartilage is compressed against the cervical spine, causing fracture and mucosal disruption.
Penetrating Trauma
Knife or stab wounds: typically cause localized injuries. Gunshot wounds: high-energy transfer with extensive tissue destruction. May involve adjacent structures (vessels, esophagus, nerve).
Clinical Presentation
Hoarseness or dysphonia: suggests vocal fold or RLN injury. Stridor: indicates significant airway narrowing. Dyspnea and respiratory distress: from edema, hematoma, or structural collapse. Subcutaneous emphysema: pathognomonic for mucosal violation with cartilage fracture. Anterior neck tenderness and pain. Loss of thyroid cartilage prominence (Adam's apple): suggests significant fracture. Hemoptysis: mucosal laceration. Dysphagia and odynophagia.
Schaefer-Fuhrman Classification
| Group | Findings | Management |
|---|---|---|
| 1 | Minor hematoma/laceration; no fracture | Observation, voice rest, steroids |
| 2 | Edema, minor mucosal disruption, non-displaced fracture | Conservative; tracheotomy if needed |
| 3 | Large lacerations, exposed cartilage, displaced fracture, VF immobility | Surgical repair within 24 hours |
| 4 | Group 3 + >2 fracture lines or massive mucosal trauma | Surgical repair, stenting |
| 5 | Complete laryngotracheal separation | Emergent tracheotomy, reanastomosis |
Group 1: minor endolaryngeal hematomas or lacerations; no detectable fracture. Group 2: edema, hematoma, minor mucosal disruption without exposed cartilage; non-displaced fracture. Group 3: massive edema, large mucosal lacerations, exposed cartilage, displaced fracture, vocal fold immobility. Group 4: same as Group 3 plus more than two fracture lines or massive trauma to the laryngeal mucosa. Group 5: complete laryngotracheal separation.
Evaluation
Airway Assessment (Priority One)
Secure the airway before any other evaluation if patient is in distress. Awake tracheotomy under local anesthesia is the safest method for securing the airway in laryngeal trauma. Avoid orotracheal intubation if possible — may convert a partial disruption into complete laryngotracheal separation. Cricothyrotomy may worsen a cricoid fracture.
Flexible Laryngoscopy
Essential in all patients with suspected laryngeal injury. Assess: mucosal lacerations, hematomas, vocal fold mobility, arytenoid dislocation, exposed cartilage, airway patency.
Imaging
CT neck with thin cuts: fracture pattern, displacement, soft tissue edema, subcutaneous emphysema. CT angiography: if vascular injury is suspected. Chest X-ray: evaluate for pneumothorax, pneumomediastinum.
Direct Laryngoscopy and Esophagoscopy
Performed in the operating room, often at the time of surgical repair. Assess the full extent of mucosal injury, anterior commissure integrity, arytenoid mobility.
Management
Group 1
Observation: humidified air, head-of-bed elevation, voice rest, steroids (controversial). Serial laryngoscopy to monitor for progression.
Group 2
Conservative management with close monitoring. Tracheotomy if airway compromise develops. Short course of steroids, anti-reflux medication, humidification. Serial endoscopic assessment.
Groups 3 and 4
Surgical exploration and repair within 24 hours for best outcomes. Tracheotomy for airway management. Thyrotomy (midline laryngofissure) for exposure. Repair mucosal lacerations with absorbable sutures. Reduce and fixate cartilage fractures with miniplates. Stenting: endolaryngeal stent (Montgomery T-tube or silicone stent) for 2-4 weeks if anterior commissure is disrupted or extensive mucosal loss. Arytenoid reduction if dislocated.
Group 5 (Laryngotracheal Separation)
Emergent tracheotomy (below the level of injury). Primary reanastomosis of the trachea to the larynx. Recurrent laryngeal nerve repair if identified. Stenting typically required.
Outcomes and Complications
Voice quality: depends on severity of initial injury and adequacy of repair; Group 1-2 generally have good voice outcomes. Airway stenosis: most feared complication; results from missed injuries, delayed repair, or inadequate stenting. Granulation tissue and web formation: at the anterior commissure. Vocal fold immobility: from RLN injury or cricoarytenoid joint fixation. Dysphagia: from laryngeal scarring or nerve injury. Decannulation failure: 5-15% in severe injuries.
Key Clinical Pearls
Awake tracheotomy is the safest airway management strategy in laryngeal trauma — avoid blind intubation. Surgical repair within 24 hours yields significantly better voice and airway outcomes than delayed repair. Subcutaneous emphysema in the neck after trauma is laryngeal fracture until proven otherwise. The anterior commissure is the most critical area to reconstruct — web formation here causes severe dysphonia. Always evaluate for concomitant esophageal and vascular injuries in penetrating laryngeal trauma. Strangulation patients with any symptoms should undergo flexible laryngoscopy and CT.
References
- Schaefer SD. The acute management of external laryngeal trauma: a 27-year experience. Arch Otolaryngol Head Neck Surg. 1992;118(6):598-604.
- Jewett BS, Shockley WW, Rutledge R. External laryngeal trauma analysis of 392 patients. Arch Otolaryngol Head Neck Surg. 1999;125(8):877-880.
- Bent JP III, Silver JR, Porubsky ES. Acute laryngeal trauma: a review of 77 patients. Otolaryngol Head Neck Surg. 1993;109(3 Pt 1):441-449.
- Verschueren DS, Bell RB, Bagheri SC, et al. Management of laryngo-tracheal injuries associated with craniomaxillofacial trauma. J Oral Maxillofac Surg. 2006;64(2):203-214.