# 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**.

![CT scan of the neck demonstrating a thyroid cartilage fracture with displacement and subcutaneous emphysema](/images/laryngeal-fracture-ct.jpg)

## 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.

![Intraoperative view of open laryngeal repair showing mucosal closure and thyroid cartilage plating after blunt laryngeal trauma](/images/laryngeal-repair-intraop.jpg)

## 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.

![Endoscopic view showing subglottic stenosis as a late complication of laryngeal trauma](/images/laryngeal-stenosis-post-trauma.jpg)

## 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

1. Schaefer SD. The acute management of external laryngeal trauma: a 27-year experience. *Arch Otolaryngol Head Neck Surg*. 1992;118(6):598-604.
2. Jewett BS, Shockley WW, Rutledge R. External laryngeal trauma analysis of 392 patients. *Arch Otolaryngol Head Neck Surg*. 1999;125(8):877-880.
3. 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.
4. 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.