Temporal Bone Fracture

Temporal bone fractures result from high-energy blunt head trauma and are found in approximately 4.7% of skull fractures and 36% of skull base fractures. [1] They carry a mortality rate of ~8% and are associated with critical neurovascular complications including hearing loss, facial nerve paralysis, CSF leak, and vascular injury. [1-3] Initial management follows ATLS principles, as these fractures rarely occur in isolation — 67% have additional skull fractures and 78% have associated intracranial hemorrhage. [1]

The following figure illustrates the classic physical exam findings of basilar skull fracture, which are frequently associated with temporal bone fractures:

1. History

• Mechanism: High-energy blunt trauma — motor vehicle collisions, falls (now the leading cause at ~42%), assaults, pedestrian-vehicle collisions [1][3]
• Laterality of impact: Lateral blows to temporal/parietal skull → longitudinal fractures; frontal/occipital blows → transverse fractures [5]
• Hearing changes: Acute hearing loss (unilateral), tinnitus, aural fullness
• Otologic symptoms: Bleeding from the ear, clear fluid from the ear or nose, vertigo/dizziness
• Facial weakness: Onset timing is critical — immediate vs. delayed facial weakness has different prognostic and management implications [6-7]
• Important negatives: Loss of consciousness, amnesia, seizure, neck pain, visual changes, other neurologic deficits

2. Alarm Features

• Immediate complete facial paralysis (House-Brackmann V–VI) — suggests nerve transection or severe compression; may require surgical exploration [6][8]
• Active CSF otorrhea or rhinorrhea — risk of ascending meningitis (meningitis rate 4.3% in otic capsule violating fractures) [9]
• Expanding hematoma or pulsatile bleeding from the ear — concern for vascular injury (internal carotid artery, sigmoid sinus) [2][10]
• Declining GCS or new focal neurologic deficits — associated intracranial hemorrhage requiring neurosurgical intervention [11]
• Bilateral temporal bone fractures — occur in ~22% of cases and indicate higher-energy mechanism [12]
• Signs of basilar skull fracture: Battle sign, raccoon eyes, hemotympanum — LR 16 for intracranial injury [11]

3. Medications

• High-dose corticosteroids: Recommended for facial nerve palsy (if not contraindicated by concurrent intracranial injury or polytrauma); however, administration in the setting of significant intracranial injury is not advised [7][13]
• Antiemetics: For acute vertigo (meclizine, ondansetron)
• Analgesics: Avoid NSAIDs acutely if concern for ongoing hemorrhage; acetaminophen preferred
• Antibiotics: Prophylactic antibiotics for CSF leak remain controversial; no strong evidence supports routine use
• Contraindicated: Ear drops through a perforated tympanic membrane (ototoxic aminoglycosides); nasal packing in CSF rhinorrhea

4. Diet

• NPO if surgical intervention anticipated or GCS depressed
• Stool softeners/avoid Valsalva if CSF leak present (to reduce intracranial pressure fluctuations)
• Hydration: Maintain euvolemia; avoid dehydration which may worsen vestibular symptoms

5. Review of Systems

• HEENT: Hearing loss, tinnitus, ear pain, ear drainage (bloody vs. clear), nasal drainage, facial asymmetry, taste changes (chorda tympani involvement)
• Neurologic: Headache, dizziness/vertigo, nausea/vomiting, vision changes, weakness, numbness, seizures, altered mental status
• Musculoskeletal: Neck pain, jaw pain (associated mandibular fractures)
• Psychiatric: Assess for intoxication (common in trauma population)

6. Collateral History and Family History

• Collateral: Witnesses to mechanism, loss of consciousness duration, anticoagulant/antiplatelet use, baseline neurologic function
• Social: Alcohol/substance use at time of injury (common contributor)
• Family history: Generally not relevant acutely; consider bleeding disorders if disproportionate hemorrhage

7. Risk Factors

• Demographics: Male predominance (~74%), mean age ~41 years [12][14]
• Mechanisms: Falls (especially elderly), MVCs, assaults, sports injuries
• Anticoagulation/antiplatelet therapy: Increases risk of intracranial hemorrhage
• Osteoporosis: Lower-energy mechanisms may cause fractures in elderly
• Alcohol intoxication: Common comorbidity in trauma, may mask symptoms and delay diagnosis [15]

8. Differential Diagnosis

• Isolated tympanic membrane perforation (without fracture)
• Mandibular condyle fracture (TMJ pain, malocclusion)
• Isolated intracranial hemorrhage without fracture
• Bell's palsy — must distinguish from traumatic facial nerve injury; history of trauma is key
• Benign paroxysmal positional vertigo — post-traumatic BPPV is common and may coexist
• Carotid artery dissection — can occur with temporal bone fractures or independently after head/neck trauma
• Cholesteatoma — delayed complication that can mimic recurrent symptoms

9. Past Medical History

• Prior ear surgery or hearing loss
• Previous head trauma
• Anticoagulant/antiplatelet use
• Bleeding disorders
• Prior neurosurgical procedures
• Chronic ear disease

10. Physical Exam

• Vital signs: Hemodynamic instability suggests polytrauma; hypertension/bradycardia (Cushing response) suggests elevated ICP
• Head: Palpate for step-offs, lacerations, depressed fractures
• Ear: Hemotympanum (most common finding, ~68% of cases), EAC lacerations, otorrhea (bloody vs. clear), TM perforation [11][16]
• Mastoid: Battle sign (postauricular ecchymosis — may take 24–48 hours to develop)
• Periorbital: Raccoon eyes (bilateral periorbital ecchymosis)
• Cranial nerves:
  • CN VII (facial nerve): Assess all branches — forehead wrinkling, eye closure, smile, lip pucker; grade using House-Brackmann scale [6]
  • CN VIII: Bedside hearing assessment (finger rub, whispered voice); Weber and Rinne tuning fork tests to differentiate conductive vs. sensorineural hearing loss
  • CN V, VI: Less commonly affected but should be assessed
• Vestibular: Nystagmus, gait assessment (if patient is ambulatory)
• Neurologic: GCS, pupillary response, motor/sensory exam

11. Lab Studies

• Routine trauma labs: CBC, BMP, coagulation studies (PT/INR, PTT), type and screen
• Blood alcohol level and urine drug screen: Common in trauma workup
• Beta-2 transferrin: Gold standard to confirm CSF in ear/nasal drainage (send if clear otorrhea or rhinorrhea suspected) [3]
• Glucose testing of fluid: Bedside halo test or glucose level of drainage (less specific than beta-2 transferrin)

12. Imaging

• First-line: Non-contrast CT head — identifies 98.6% of temporal bone fractures on routine trauma CT. Evaluate for intracranial hemorrhage, pneumocephalus, fracture lines [1]
• Dedicated temporal bone CT (thin-section, 0.5–0.625 mm with multiplanar reconstructions): Indicated when facial nerve injury or vascular injury is suspected, or when routine CT is negative but clinical suspicion remains high [1-2]
• CT angiography (CTA): If fracture involves the carotid canal or there is concern for vascular injury (carotid dissection, sigmoid sinus thrombosis) [2][10]
• MRI: Reserved for evaluating facial nerve integrity, inner ear fluid signal changes, or encephalocele in subacute/chronic settings [10]
• Key imaging findings to evaluate: Otic capsule integrity, ossicular chain disruption, tegmen defects, facial nerve canal involvement, carotid canal involvement [10]

13. Special Tests

Classification Systems:

• Electroneurography (ENoG): Indicated for complete facial paralysis; >90% degeneration within 2 weeks suggests poor prognosis and may warrant surgical decompression [3][6]
• Electromyography (EMG): Assess for voluntary motor unit potentials; useful 2–3 weeks post-injury
• Audiometry: Formal audiogram once patient is stable — differentiates conductive vs. sensorineural vs. mixed hearing loss [9]
• Schirmer's test: Assesses lacrimation; helps localize facial nerve injury level [8]

14. ECG

• Not specifically indicated for temporal bone fracture itself
• Obtain per standard trauma protocols if polytrauma, hemodynamic instability, or elderly patient
• Monitor for arrhythmias if significant intracranial hypertension (Cushing reflex)

15. Assessment

Severity stratification is driven by the otic capsule classification rather than the traditional longitudinal/transverse system: [9][17-18]

• Otic capsule sparing (OCS): ~90% of fractures. Functional hearing recovery (≥30 dB improvement) in 90.4% at 24 months. Conductive hearing loss predominates. Complication rate ~6% [9]
• Otic capsule violating (OCV): ~10% of fractures. 0% functional hearing recovery at 24 months. Complication rate ~31.5%, including CSF leak (13.8%) and meningitis (4.3%). Associated with irreversible sensorineural hearing loss and higher rates of facial nerve injury [9][19]

Key complications to anticipate:

• Immediate: Intracranial hemorrhage, facial nerve paralysis, CSF leak, vascular injury
• Short-term: Hearing loss (CHL ~31%, SNHL ~13% in pediatric series), vertigo, meningitis [20]
• Delayed: Cholesteatoma, encephalocele, post-traumatic BPPV, late meningitis [3]

16. Treatment Plan

Initial Stabilization:

• ATLS protocol; address life-threatening injuries first [3]
• Secure airway, C-spine precautions, treat intracranial hemorrhage

CSF Leak Management:

• Conservative first: Head of bed elevation (30°), bed rest, avoid straining/nose blowing, stool softeners
• Most CSF leaks resolve spontaneously within 7–10 days [9][19]
• Lumbar drain if persistent beyond 7–14 days
• Surgical repair for refractory leaks [21]

Facial Nerve Injury:

• Delayed-onset palsy (most common): High-dose corticosteroids (e.g., prednisone 1 mg/kg/day taper); excellent prognosis, >90% recover spontaneously [6-7]
• Immediate complete paralysis: Corticosteroids + serial ENoG monitoring. If >90% degeneration on ENoG within 2 weeks → consider surgical decompression [6][22]
• Surgical decompression ideally within 8 weeks of injury yields best outcomes (91.7% achieve HB I–II) [22]
• Eye care: Artificial tears, lubricating ointment, moisture chamber/taping at night to prevent exposure keratopathy [6]

Hearing Loss:

• Conductive: Often from hemotympanum (resolves) or ossicular disruption (may require ossiculoplasty after 3–6 months) [8][19]
• Sensorineural: No proven medical treatment; consider hearing aids or cochlear implantation for severe/profound loss [9]

Vestibular Symptoms:

• Post-traumatic BPPV: Epley maneuver
• Acute vestibular suppression: Short-term vestibular suppressants; early vestibular rehabilitation

17. Disposition

Admission criteria:

• GCS < 15 or declining neurologic status
• Associated intracranial hemorrhage or polytrauma
• Active CSF leak
• Immediate facial nerve paralysis
• Otic capsule violating fracture
• Suspected vascular injury
• Need for neurosurgical monitoring

Inpatient ENT/Otolaryngology consultation triggers (high sensitivity screening): Acute facial nerve paresis/paralysis, clear otorrhea, bloody otorrhea, or otic capsule involvement on CT — this approach captures 93.5% of patients with post-traumatic facial nerve dysfunction and 100% of CSF leaks [12]

Outpatient follow-up appropriate if:

• Isolated OCS fracture without facial weakness, CSF leak, or significant otorrhea
• Neurologically intact (GCS 15)
• No other injuries requiring admission
• This approach can safely reduce inpatient ENT consults by ~43% [12]

18. Follow Up / Return Precautions

Follow-up timing:

• ENT/Otolaryngology: Within 1–2 weeks for all temporal bone fractures; sooner if facial weakness or CSF leak
• Audiology: Formal audiogram once hemotympanum resolves (typically 4–6 weeks)
• Neurosurgery: As indicated for intracranial pathology

Return precautions — seek immediate care for:

• New or worsening facial weakness
• Clear fluid draining from ear or nose (CSF leak)
• Fever, severe headache, neck stiffness (meningitis)
• Worsening hearing loss
• New-onset seizures
• Increasing dizziness or inability to ambulate

Patient counseling:

• Keep ear dry; no water in the ear canal
• Do not insert anything into the ear canal
• Avoid nose blowing, straining, heavy lifting (if CSF leak concern)
• Hearing loss from hemotympanum typically improves over weeks as blood resorbs
• Delayed complications (cholesteatoma, late meningitis) can occur months to years later — long-term otologic follow-up is important [3]

Expected recovery:

• OCS fractures: Excellent hearing recovery in ~90% at 24 months [9]
• OCV fractures: Hearing deficits are typically permanent [9]
• Delayed facial palsy: >90% spontaneous recovery [6]
• Immediate complete facial palsy with surgical decompression within 8 weeks: ~80–92% achieve HB I–II [8][22]

References

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