Hangman’s Fracture

Modern Study Review (AI-Generated)

High-Yield Summary

Hangman’s fracture, or traumatic spondylolisthesis of the axis (C2), is a critical cervical spine injury resulting from bilateral fractures through the pars interarticularis of C2. It is most commonly caused by hyperextension and axial loading mechanisms, such as motor vehicle accidents or falls. Accurate classification and timely management are essential to prevent neurological compromise and optimize cervical spine stability and function.

Key Diagnostic Findings

Anatomy

• Axis (C2): The second cervical vertebra with a unique odontoid process and bilateral pars interarticularis.
• Pars interarticularis: The bony segment between the superior and inferior articular facets; site of fracture in Hangman’s fracture.
• C2-3 segment: The motion segment involved in displacement and angulation in this injury.

Clinical Presentation

• Neck pain and tenderness over the upper cervical spine.
• Possible limited neck range of motion.
• Neurological deficits are uncommon but may occur with severe displacement or associated injuries.
• History often includes high-energy trauma with hyperextension.

Imaging

• Lateral cervical spine X-ray: Primary modality showing bilateral pars fractures, displacement, and angulation at C2-3.
• CT scan: Gold standard for detailed fracture morphology and facet involvement.
• MRI: Useful for evaluating ligamentous injury and spinal cord status if neurological symptoms are present.

Classification Systems

Note: The Levine and Edwards classification (1985) is the current standard, refining Effendi’s original system.

Current Gold Standard Treatment

Non-operative

• Indications: Type 1 and select Type 2 fractures without significant displacement or neurological deficit.
• Treatment: Rigid cervical immobilization with a cervical collar or halo vest for 8-12 weeks.
• Goals: Promote fracture healing, maintain alignment, and preserve motion.

Operative

• Indications: Type 2 fractures with significant displacement or angulation, Type 2A, and all Type 3 fractures with facet dislocation or instability.
• Procedures:
• Closed reduction and halo traction initially for Type 2 injuries.
• Open reduction and internal fixation (ORIF): C2 pars screw fixation or C2-3 anterior cervical fusion for unstable fractures.
• Posterior C2-3 fusion: Preferred in cases with facet dislocation or failed closed management.
• Goals: Restore stability, prevent neurological injury, and allow early mobilization.

Modern Complications & Outcomes

Complications

Outcomes

• Most Type 1 and stable Type 2 fractures heal well with conservative treatment, preserving good neck function.
• Surgical stabilization yields excellent outcomes in unstable fractures, with low rates of neurological complications.
• Early diagnosis and appropriate classification guide treatment, optimizing pain relief and functional recovery.

Classic Clinical Notes

Hangman’s Fracture

(Traumatic Spondylolisthesis of Axis)

• (Levine and Edwards ’85, modification of Effendi ’81)
• Based on translation/angulation of C2-3 on lateral x-ray
• Bilateral fracture through base of pars interarticularis

Type 1 – (most common) – no angulation, 3 mm displaced
(2A – minimal translation, significant angulation)
Type 3 – (rare) – unilateral or bilateral facet dislocation in addition to fracture of pars

Treatment

• Type 1 – stable; cervical collar immobilization x 8-12 weeks
• Type 2 – halo traction / closed reduction
• Type 3 – ORIF C2-3 fusion

Last Updated on January 25, 2026 by orthonet