01Approach to the Critical Patient/attcp41

Immediate stabilization

›Cervical spine immobilization priorities

›Manual in-line stabilization until rigid collar applied

›Avoid neck flexion or extension during all maneuvers

›Log-roll technique for any repositioning

›Rigid cervical collar placement (Philadelphia or Miami-J)

›Properly sized collar to prevent motion at C1-C2-C3

›Reassess fit after any patient movement

›Airway management precautions

›Inline stabilization maintained during laryngoscopy if intubation required

›Video laryngoscopy preferred to minimize cervical motion

›If respiratory compromise from high cervical injury, early airway control

Hemodynamic assessment

›Shock pattern differentiation

›Neurogenic shock (bradycardia + hypotension)

›Vasopressor support: norepinephrine first-line

›Atropine 0.5-1 mg IV for symptomatic bradycardia

›IV fluid resuscitation: crystalloid bolus 500-1000 mL, reassess

›Hemorrhagic shock (tachycardia + hypotension)

›Systematic search for occult bleeding sources in polytrauma

›Massive transfusion protocol if hemodynamically unstable

›MAP target >= 85 mmHg in presence of spinal cord injury

›Maintains spinal cord perfusion pressure

Critical decision points

›Escalation triggers requiring immediate action

›Any new or progressive neurological deficit

›Emergent spine surgery consultation

›Emergent MRI if not contraindicated

02History/hx61

Mechanism and presentation

›Mechanism of injury

›Motor vehicle collision (most common in young adults)

›Forehead or face striking windshield or dashboard — hyperextension-axial load pattern

›Speed and force of impact

›Head position at time of collision

›Fall from height

›Distance of fall

›Head-first or face-first landing

›Ground-level fall in elderly (most common mechanism in older patients)

›Low-energy falls can produce hangman's fracture in osteoporotic spine

›Diving injury

›Shallow water impact

›Combined hyperextension and axial loading

›Assault or sports injury

›Cardinal symptoms

›Posterior upper cervical neck pain (virtually universal)

›Severity disproportionate to apparent mechanism in elderly

›Neck stiffness and guarding

›Transient neurological symptoms at time of injury

›Transient upper or lower extremity weakness

›Transient numbness or paresthesias

›Loss of consciousness at time of injury

Neurological and vascular symptoms

›Extremity neurological symptoms

›Upper extremity weakness

›Grip strength loss

›Biceps or triceps weakness

03Physical Exam/exam50

Vitals and general

›Hemodynamic pattern interpretation

›Bradycardia + hypotension

›Neurogenic shock until proven otherwise

›Heart rate < 60 bpm + SBP < 90 mmHg

›Tachycardia + hypotension

›Hemorrhagic shock from associated injuries

›Respiratory rate and oxygen saturation

›Rate >= 30 per minute as severity marker

›SpO2 < 92% on room air requires supplemental oxygen

›General appearance

›Posturing or voluntary cervical immobilization

›Facial and forehead lacerations or contusions

›Suggest hyperextension mechanism

›"Raccoon eyes" or "Battle sign" — skull base fracture association

Cervical spine examination

›Posterior midline tenderness

›C2 spinous process tenderness (virtually always present)

›Step-off deformity palpation at C2 level

›Cervical spine immobilization maintained throughout exam

›No flexion-extension or rotation testing acutely

›All movements in strict log-roll fashion

Neurological examination

›Motor examination (upper extremities)

›Deltoid strength (C5)

›Biceps strength (C5-C6)

›Wrist extension (C6)

›Triceps strength (C7)

04Differential Diagnosis/ddx40

C2 fracture variants

›Odontoid (dens) fracture (Anderson-D'Alonzo classification)

›Type I: Tip of dens, stable (ICD-10: S12.110)

›Type II: Base of dens, most common and most unstable (ICD-10: S12.120)

›Type III: Body of C2 extending into cancellous bone (ICD-10: S12.130)

›Distinguishing feature: Fracture line at odontoid base versus bilateral pars

›Atypical hangman's fracture

›Fracture through posterior vertebral body rather than pars interarticularis

›Higher neurological risk — canal narrowing rather than widening

›Neurological injury rate up to 33%

›C2 lateral mass fracture

›Isolated lateral mass involvement

›Lower instability than classic hangman's

Associated upper cervical injuries

›Jefferson fracture (C1 burst fracture) — ICD-10: S12.000

›Coexists with hangman's fracture in ~26% of cases

›Axial loading mechanism

›Transverse ligament integrity determines stability

›Atlanto-occipital dissociation

›High-energy trauma

›Often fatal

›BAI-BDI criteria on CT

›Atlanto-axial instability

›Rheumatoid arthritis, Down syndrome backgrounds

Subaxial and ligamentous injuries

›Subaxial cervical fracture-dislocation

›Different vertebral level (C3-C7)

›SLIC classification applicable

05Laboratory Tests/lt31

Routine trauma labs

›Complete blood count

›Baseline hemoglobin for hemorrhagic shock assessment

›Thrombocytopenia increases bleeding risk in operative management

›Basic metabolic panel

›Electrolytes, creatinine for anesthesia planning

›Glucose dysregulation in high cervical cord injury (autonomic dysfunction)

›Coagulation studies

›PT/INR and aPTT

›Anticoagulant reversal planning if urgent surgery required

›Fibrinogen if massive transfusion anticipated

›Type and screen

›All patients with significant mechanism

›Type and crossmatch if hemorrhagic shock

Toxicology and metabolic

›Blood alcohol level

›Exam reliability assessment

›Mechanism contribution assessment

›Urine drug screen

›CNS depressants masking neurological exam

›Lactate

›Occult hypoperfusion in polytrauma

›>= 2 mmol/L indicates tissue hypoperfusion

›Venous blood gas

›Acidosis severity in shock states

›pCO2 monitoring if respiratory compromise

Osteoporosis workup (non-emergent)

›Calcium and phosphate

06Diagnostic Tests/dt96

Scoring Systems

›Levine-Edwards Classification (primary management guide)

›Type I: Hairline fracture, no angulation, displacement <= 3 mm, C2-C3 disc intact

›Stable pattern

›Management: rigid cervical collar 10-14 weeks

›Union rate 94-100%

›Type II: Displaced fracture with angulation > 11 degrees, displacement > 3 mm, C2-C3 disc disrupted

›Discoligamentous instability

›Management: halo vest or surgery (displacement >= 6 mm favors surgery)

›Type IIa: Minimal translation but severe angulation, flexion-distraction mechanism, C2-C3 disc disrupted

›No traction — traction worsens displacement

›Management: rigid halo or surgical fixation

›Type III: Displaced with bilateral C2-C3 facet dislocation, severe displacement and angulation

›Most unstable pattern

›Management: surgical fixation required

›NEXUS Criteria (cervical spine clearance)

›Five criteria: no midline tenderness, normal alertness, no intoxication, no focal neurological deficit, no painful distracting injury

›All five must be absent to clear cervically without imaging

›Sensitivity 99.6%, specificity 12.9%

›Hangman's fracture patients typically do NOT meet NEXUS low-risk criteria

›Canadian C-Spine Rule (CCR)

›Three-part decision aid for alert, stable trauma patients

›High-risk factors: age >= 65, dangerous mechanism, paresthesias in extremities

›Low-risk factors: simple MVC, ambulatory, delayed onset neck pain, absence of midline tenderness

›Sensitivity 99.4%, specificity 45.1%

›ASIA/ISNCSCI Spinal Cord Injury Grading

›Grade A: Complete — no motor or sensory function below injury level

›No sacral sparing

›Grade B: Incomplete — sensory but no motor function preserved below injury

›Grade C: Incomplete — motor function below injury, majority of key muscles < grade 3

›Grade D: Incomplete — motor function below injury, majority of key muscles >= grade 3

›Grade E: Normal motor and sensory function

MRI

›Indications for MRI cervical spine

›Neurological deficits present (any motor or sensory deficit)

›Spinal cord compression assessment

›ASIA grading correlation

›CT shows fracture but mechanism suggests ligamentous injury

›C2-C3 disc disruption assessment — determines stability classification

›Neck pain disproportionate to CT findings

›Concern for occult ligamentous injury in obtunded patient

›Clearance prior to collar removal

›MRI findings in hangman's fracture

›C2-C3 disc disruption

›Key determinant distinguishing Types I/II/IIa/III

›Hyperintense disc signal on T2 indicates disruption

›Spinal cord signal change

›T2 hyperintensity indicates edema or contusion

›Intramedullary hemorrhage on T2* or GRE — poor prognosis

›Epidural hematoma

›T1 hyperintense collection compressing cord

›Emergent surgical drainage if compressive

›Prevertebral hematoma

›T2 hyperintense soft tissue anterior to vertebral bodies

›Contraindications and limitations

›Non-MRI compatible implants (pacemakers, some surgical hardware)

›Patient hemodynamic instability — CT/CTA first

›Artifact from cervical collar (removable components may be needed)

CT

›CT cervical spine (reference standard for bony injury)

›Sensitivity 98-100% for clinically significant fractures

›Specificity > 97%

›ACR Appropriateness Criteria: usually appropriate for suspected cervical spine trauma (2024 update)

›Protocol: non-contrast, thin-slice (1 mm) with sagittal and coronal reformats

›Bone algorithm for fracture detail

›Soft tissue algorithm for prevertebral swelling

›Plain radiographs NOT recommended as primary screening

›Sensitivity only 36-64% for cervical fractures

›CT findings in hangman's fracture

›Bilateral fractures through C2 pars interarticularis (isthmus/pedicles)

›Fracture lines clearly visible on axial and sagittal reformats

›Anterior displacement of C2 vertebral body relative to C3 (Type II/III)

›Angulation at C2-C3 disc space

›Facet joint assessment at C2-C3

›Perched or dislocated facets indicate Type III

›Transverse foramen involvement

›Indicates vertebral artery injury risk — triggers CTA

›Associated fractures

›C1 ring fractures in 26% of cases

›Subaxial fractures in up to 10%

›CTA head and neck (BCVI screening)

›Indications: fracture through transverse foramen, subluxation/dislocation, any upper C-spine fracture (C1-C3) with OR 2.2 for BCVI

›Vessel injury rates up to 17% in upper cervical fractures

›Identifies vertebral artery dissection, pseudoaneurysm, occlusion

›Modified Denver criteria or EAST guidelines guide CTA use in trauma

Ultrasound

›Focused Assessment with Sonography in Trauma (FAST exam)

›Not diagnostic for cervical spine injury

›Used in polytrauma setting to identify abdominal free fluid

›Pericardial tamponade assessment

›Extended FAST (eFAST)

›Pneumothorax identification

›Bilateral pleural sliding assessment

›Vascular ultrasound (limited role in acute setting)

›Carotid duplex for BCVI if CTA not immediately available

›Less sensitive than CTA for vertebral artery injury

›Does not visualize C1-C3 segment well

›Bedside airway ultrasound

›Tracheal confirmation after intubation if capnography unavailable

›Cricothyroid membrane identification for emergency airway planning

07Disposition/dispo28

Admission criteria

›ICU admission indications

›Neurogenic shock (bradycardia + hypotension requiring vasopressors)

›Hemodynamic monitoring and vasopressor titration

›Respiratory compromise or diaphragmatic paresis

›Ventilator management

›High-grade spinal cord injury (ASIA A or B)

›MAP goal >= 85 mmHg maintained for 7 days (Class IIb evidence)

›Type III fractures requiring surgical planning

›Polytrauma with hemodynamic instability

›General ward admission indications

›Type II or IIa fractures without neurological deficit

›Spine surgery consultation and definitive management planning

›Halo vest application or pre-operative planning

›All fractures with pending surgical decision

›Inability to arrange safe outpatient follow-up

Discharge criteria (Type I only)

›Requirements for discharge of isolated Type I fractures

›Neurologically intact — complete and normal neurological exam

›Hemodynamically stable throughout observation

›Spine surgery consultation completed and discharge approved

›Rigid cervical collar fitted and patient instructed on care

›Reliable follow-up arranged within 1-2 weeks

›Patient and family clearly understand return-to-ER criteria

Transfer criteria

›Transfer to spine surgery-capable center

›Any Type II, IIa, or III fracture at facility without spine surgery

›Any neurological deficit requiring surgical decompression

08Treatment/t62

Immediate interventions

›Cervical immobilization (all types)

›Rigid cervical collar (Philadelphia or Miami-J)

›Properly sized: prevents chin and occiput overhang

›Maintains until definitive management determined

›Log-roll precautions for all repositioning

›Minimum 3-person log-roll with dedicated head/neck controller

Analgesia

›Pain management protocol

›IV acetaminophen 1000 mg every 6-8 hours (preferred — no sedation)

›Dose reduction for body weight < 50 kg: 15 mg/kg

›IV opioids (avoid oversedation — neurological exam preservation critical)

›Morphine 2-4 mg IV every 4-6 hours PRN

›Hydromorphone 0.2-0.4 mg IV every 4-6 hours PRN if morphine contraindicated

›NSAIDs (acceptable if no contraindications, but may impair bone healing)

›Avoid in patients anticipated for surgical fusion

›Ketamine low-dose adjunct (0.1-0.3 mg/kg IV) for opioid-sparing

Type-specific management

›Type I: Conservative management

›Rigid cervical collar for 10-14 weeks

›Philadelphia or Miami-J collar — worn 24/7

›Collar removal only under physician supervision

›Union rate 94-100% with conservative management

›All 28 patients in multicenter prospective study healed at 1 year

›Repeat CT at 6 weeks and 3 months to confirm healing

›Flexion-extension radiographs at 6 weeks for dynamic stability assessment

›Type II: Management options

›Displacement < 6 mm without angulation: rigid collar trial acceptable

›Close follow-up with repeat imaging at 2-4 weeks

›Displacement >= 6 mm or failure to maintain alignment: surgical fixation

›Halo vest immobilization: alternative in selected patients

›Halo ring applied under fluoroscopic guidance

›4-pin fixation with 6-8 lbs torque (frontal pins) and 4-6 lbs (occipital pins)

›Surgery: anterior C2-C3 ACDF with plating or posterior C2 pedicle screw fixation

›Type IIa: Modified approach

›Do NOT apply cervical traction

›Flexion-distraction mechanism — traction worsens posterior element separation

›Rigid halo vest immobilization with mild compression

›Surgical stabilization if halo fails or neurological deficit present

›Type III: Surgical fixation required

›Anterior approach: C2-C3 discectomy and fusion (ACDF) with plating

›Provides immediate stability

›Allows early mobilization

›Fusion rate ~99%

›Posterior approach: C2 pedicle screw fixation or C1-C3 Harms-Goel construct

›CT-guided C2 pedicle screw placement preferred for accuracy

›Minimally invasive percutaneous screw fixation available at specialized centers

›Combined anterior-posterior approach for severe instability or failed primary fixation

BCVI management (when identified)

›Antithrombotic therapy per institutional protocol

›Aspirin 81-325 mg daily — commonly used for low-grade BCVI

›Grade I-II vertebral artery dissection (intimal irregularity or < 25% stenosis)

›Heparin infusion: initial 60-80 units/kg bolus, then 12-18 units/kg/hour

›Target aPTT 60-100 seconds

›Preferred for high-grade BCVI (occlusion, pseudoaneurysm) or stroke risk

›Duration: typically 3-6 months with repeat vascular imaging

›Endovascular intervention for pseudoaneurysm or high-grade stenosis

›Stenting or coil embolization at experienced centers

DVT and prophylaxis

›VTE prophylaxis

›Mechanical prophylaxis first (sequential compression devices)

›Initiated immediately on admission

›Both lower extremities

›Pharmacologic prophylaxis (low molecular weight heparin)

›Enoxaparin 40 mg subcutaneously daily

›Hold until surgical clearance from spine team

›Contraindicated with active epidural hematoma

09Special Populations/sp55

Pregnancy

›Imaging considerations

›CT cervical spine indicated despite radiation exposure

›Life-threatening injury takes priority over fetal radiation exposure

›Fetal radiation dose from cervical CT approximately 0.001-0.01 mGy (negligible)

›MRI preferred for follow-up ligamentous assessment

›Avoid gadolinium contrast in first trimester unless essential

›Fetal monitoring after significant trauma

›Cardiotocography for >= 4 hours post-trauma if > 24 weeks gestation

›Management modifications

›Halo vest application feasible but requires careful pin placement

›Avoid in advanced pregnancy due to body habitus

›Surgical positioning: left lateral tilt 15 degrees to relieve aortocaval compression

›Multidisciplinary team: spine surgery, obstetrics, anesthesia

›NSAIDs contraindicated in third trimester (premature ductal closure)

›Opioids: short-term use acceptable with neonatal monitoring

Geriatric

›Epidemiology and risk

›Ground-level falls are most common mechanism in elderly (>= 65 years)

›Low-energy mechanisms sufficient to produce hangman's fracture in osteoporotic C-spine

›Higher rate of concomitant injuries from falls (hip fracture, traumatic brain injury)

›Ankylosing spondylitis and DISH alter fracture biomechanics — larger force transmission

›Management considerations

›Halo vest poorly tolerated in elderly

›Pin site infections more common

›Aspiration risk with restricted neck position

›Surgical fixation often preferred over prolonged halo immobilization

›Anticoagulant reversal if on warfarin, DOACs, or antiplatelet agents

10Background/b72

Epidemiology

›Incidence and demographics

›Hangman's fracture accounts for 15-20% of all cervical spine fractures

›Second most common C2 fracture after odontoid fractures

›Bimodal age distribution

›Young adults (20-40 years): high-energy mechanisms (MVC, diving)

›Elderly (> 65 years): low-energy falls

›Male predominance in high-energy mechanisms (MVC)

›Mechanism distribution

›Motor vehicle collisions: most common overall

›Face or forehead striking windshield or dashboard

›Falls from height or ground level: increasingly prevalent with aging population

›Diving injuries: associated with cervical cord injury

›Associated injuries

›Concomitant C1 ring fractures: ~26% of cases (Li et al. systematic review 2006)

›Blunt cerebrovascular injury: OR 2.2 for upper C-spine fractures

›Head injury/TBI common in high-energy mechanisms

›Thoracic and abdominal injuries in MVC polytrauma

›Neurological injury rate

›Overall neurological deficit: ~26% (mostly mild) despite bilateral fractures

›Paradoxical spinal canal widening from fracture pattern protects cord

›Atypical hangman's fractures: up to 33% neurological injury rate

›Fracture through posterior vertebral body narrows canal

Pathophysiology

›Injury mechanism

›Hyperextension combined with axial loading is the classic mechanism

›Head forced into extension — failure of C2 pars interarticularis in tension

›Posterior elements separate — anterior longitudinal ligament may avulse

›Flexion-distraction (Type IIa variant)

›Posterior element separation with C2-C3 disc disruption and angulation

›NO translation — angulation is the predominant finding

›Fracture anatomy

›Bilateral fractures through the pars interarticularis (isthmus) of C2

›Separates C2 into two segments: posterior ring and anterior vertebral body

›Anterior body with C3 may translate forward (spondylolisthesis)

›Paradoxical canal decompression

›Posterior ring remains attached to C1

›Anterior body moves forward — net effect widens spinal canal at C2 level

›Explains low neurological injury rate in typical hangman's fracture

›Atypical variant: fracture through posterior vertebral body

›Posterior wall of vertebral body becomes displaced fragment

›Bony fragment narrows canal — high cord injury risk

›Stability determinants

›C2-C3 disc integrity is the key stability determinant

›Intact disc (Type I): inherently stable

›Disrupted disc (Types II, IIa, III): progressive instability

›C2-C3 facet capsule disruption indicates Type III — most unstable

›Displacement > 3 mm and angulation > 11 degrees predict instability

Therapeutic Considerations

›Evidence base for management

›Conservative management outcomes (Prost et al. 2019, multicenter prospective n=34)

›94-100% fracture union rate with rigid collar or halo vest

›All re-evaluated patients achieved healing at 1-year follow-up

›Surgical fixation reserved for failed conservative management or Type III

›Systematic review evidence (Li et al. 2006, European Spine Journal)

›Type I: collar management uniformly successful

›Type III: surgery universally required

›Type II: remains most controversial — displacement threshold guides choice

›Systematic review (Murphy et al. 2017, Journal of Orthopaedic Trauma)

›Fusion rates ~99% with surgical fixation

›Comparable outcomes between anterior (ACDF) and posterior approaches

›Surgical decision thresholds

›Type II displacement >= 6 mm: surgical fixation preferred over halo

›Failure rate of halo higher with greater displacement

›Type IIa: compression (not traction) corrects angulation

›Critical principle — traction increases posterior element gap

›Type III: bilateral facet dislocation requires surgical reduction and fixation

›BCVI therapeutic principles

›Antithrombotic therapy reduces stroke risk from vertebral artery dissection

›Screening with CTA essential given OR 2.2 for BCVI in upper cervical fractures

›Denver grading scale guides treatment intensity

›Grade I-II: antithrombotic therapy

›Grade III (pseudoaneurysm): endovascular or anticoagulation

›Grade IV (occlusion): anticoagulation

›Grade V (transection): surgical or endovascular repair

11Patient Discharge Instructions/pdi37

copy discharge instructions

›Diagnosis and injury summary

›Cervical spine fracture at the C2 level (hangman's fracture)

›Fracture of the second neck vertebra

›You have been fitted with a rigid cervical collar to immobilize your neck while the fracture heals

›Collar instructions

›Wear your rigid cervical collar at all times — 24 hours a day, 7 days a week

›Do not remove the collar without specific instructions from your spine surgeon

›You may gently clean the skin under the collar using a damp cloth with a helper holding your head still

›Sleep with the collar on — use a cervical pillow if recommended by your surgeon

›No driving while wearing the cervical collar

›Restricted range of motion makes safe driving impossible

›Activity restrictions

›No lifting anything heavier than a glass of water until cleared by spine surgeon

›No sports, running, or vigorous physical activity

›No swimming or submersion of collar in water

›Stairs are permitted with caution and a handrail

›Follow-up schedule

›Spine surgery clinic within 1-2 weeks of discharge — keep this appointment

›Your surgeon will assess fracture alignment and healing

›Repeat CT scan at approximately 6 weeks to assess healing

›Repeat CT or flexion-extension X-rays at 3 months to confirm fracture union

›Return to the emergency department immediately for

›New or worsening numbness, tingling, or weakness in the arms or legs

›Difficulty breathing or shortness of breath

›Loss of control of bladder or bowel function

›Sudden worsening of neck pain

›Difficulty swallowing

12References/r40

Guidelines and key sources

›Prost S, Barrey C, Blondel B, et al.

›Hangman's Fracture: Management Strategy and Healing Rate in a Prospective Multi-Centre Observational Study of 34 Patients

›Orthopaedics and Traumatology: Surgery and Research (OTSR). 2019

›PMID: 31005699

›Li XF, Dai LY, Lu H, Chen XD.

›A Systematic Review of the Management of Hangman's Fractures

›European Spine Journal. 2006

›PMID: 16235100

›Murphy H, Schroeder GD, Shi WJ, et al.

›Management of Hangman's Fractures: A Systematic Review

›Journal of Orthopaedic Trauma. 2017

›PMID: 28816880

›Hassankhani A, Freeman CW, Banks J, et al.

›ACR Appropriateness Criteria: Acute Spinal Trauma — 2024 Update

›Journal of the American College of Radiology. 2025

›https://linkinghub.elsevier.com/retrieve/pii/S1546-1440(25)00119-X

›Schroeder GD, Vaccaro AR, Welch WC, et al.

›Best Practices Guidelines: Spine Injury

›American College of Surgeons. 2022

›https://www.facs.org/media/k45gikqv/spine_injury_guidelines.pdf

›Du PZ, Christopher ND, Ganapathy V.

›Association Between Cervical Fracture Patterns and Blunt Cerebrovascular Injury When Screened With CTA

›The Spine Journal. 2024

›PMID: 37734494

›Beucler N.

›Open Reduction and C1-C3 Posterior Harms-Goel Fixation for Unstable Hangman's Fracture: Technical Note

›Neurosurgical Review. 2024

Evidence & Review

Evidence & Review