Long Island Cervical Fracture
Lawyer

The Seven Cervical Vertebrae: C1 Through C7

The cervical spine consists of seven vertebrae (C1–C7) that protect the spinal cord from the base of the skull to the thoracic spine. Unlike the thoracic and lumbar vertebrae, cervical vertebrae have unique anatomical features that determine their fracture patterns. C1 (atlas) is a bony ring without a vertebral body — it supports the skull and articulates with the occiput above and C2 below. C2 (axis) has the odontoid process (dens) projecting upward into the ring of C1, held in position by the transverse ligament. The atlantoaxial joint (C1-C2) is the most mobile segment of the cervical spine, providing approximately 50% of total cervical rotation (45° each direction) and 50% of total flexion-extension — this extreme mobility makes it the most vulnerable segment to fracture in high-energy motor vehicle collisions. Subaxial cervical vertebrae (C3–C7) have vertebral bodies, pedicles, laminae, facet joints, and foramina transversaria — the bony canals through which the vertebral arteries travel from C6 to C2.

Upper Cervical Fractures: C1 and C2

Jefferson Fracture (C1 Burst): A Jefferson fracture is a burst fracture of the C1 ring caused by axial compressive load — the skull is driven downward into the atlas, causing outward fracture of all four arches of the C1 ring simultaneously. The classic mechanism is rollover MVA with roof crush or diving injury. Diagnosis requires CT cervical spine; the open-mouth odontoid X-ray view demonstrates lateral mass spreading (widening of C1 on C2). Stability depends on the transverse ligament: if the combined lateral mass overhang is less than 7 mm (rule of Spence), the transverse ligament is likely intact and the fracture is biomechanically stable, permitting treatment with rigid cervical collar. Overhang exceeding 7 mm indicates transverse ligament rupture; MRI confirms ligament status. Jefferson fractures with transverse ligament disruption are unstable and may require C1-C2 posterior fusion.

Hangman’s Fracture (Traumatic Spondylolisthesis of C2): A Hangman’s fracture is bilateral fracture through the pedicles (pars interarticularis) of C2, producing forward displacement of C2 on C3. The mechanism is hyperextension combined with axial load — classically rear-end collision, frontal impact with dashboard, or rollover. The Effendi classification defines four types: Type I (fracture without displacement, C2-C3 disc intact, stable); Type II (fracture with significant displacement and angulation, C2-C3 disc disrupted — most common, treated with halo vest); Type IIA (flexion variant with severe angulation but minimal translation — requires halo vest, NOT traction); Type III (displacement with bilateral C2-C3 facet dislocation — most unstable, requires urgent surgical reduction and posterior fusion). A Hangman’s fracture satisfies New York’s §5102(d) fracture per se category as a matter of law regardless of treatment or neurological deficit.

Odontoid (Dens) Fractures — Anderson & D’Alonzo Classification: Odontoid fractures are classified into three types. Type I is a fracture of the tip of the dens above the transverse ligament — rare and generally stable, treated with collar. Type II is a fracture at the base of the dens — the most common odontoid fracture pattern and the one with the highest non-union risk (20–30% overall, up to 60% in patients over 65) because the fracture traverses the narrow waist of the dens where blood supply is most limited. Type III extends into the body of C2 — generally stable with good blood supply and high union rate with halo vest. The clinical importance of odontoid fractures in personal injury litigation is that Type II fractures in older patients frequently progress to non-union, requiring a second surgery (C1-C2 posterior fusion) that permanently eliminates approximately 50% of cervical rotation.

Subaxial Cervical Fractures: C3 Through C7

Subaxial cervical fractures are classified by the AO Spine cervical classification: Type A (compression morphology — includes burst fractures and teardrop fractures); Type B (distraction — tension band injuries including flexion-distraction and Chance-equivalent injuries); Type C (translational/rotational — most unstable, includes bilateral facet dislocation).

Flexion Teardrop Fracture: The flexion teardrop fracture is the most unstable and dangerous subaxial cervical fracture pattern. Caused by extreme hyperflexion with axial load (head-on collision, diving), the injury creates a small triangular fragment at the anteroinferior corner of the vertebral body ("teardrop") with posterior displacement of the remaining vertebral body into the spinal canal. The injury disrupts all three spinal columns simultaneously: the anterior column (vertebral body fracture), the middle column (posterior vertebral body retropulsion into canal), and the posterior column (PLC disruption). Spinal cord injury is present in the majority of cases involving true flexion teardrop fractures. Surgical treatment — anterior corpectomy and fusion or combined anterior/posterior surgery — is required.

Burst Fractures (C3-C7): Burst fractures result from axial compressive load without significant flexion or extension and cause circumferential fracture of the vertebral body with retropulsion of bone fragments into the spinal canal. AO Type A3 (incomplete burst) and A4 (complete burst) correspond to the severity of vertebral body comminution. Canal compromise is quantified on CT and determines urgency of surgical decompression. Anterior cervical corpectomy/fusion (ACCF) with strut graft and plating is the standard surgical approach for burst fractures causing neurological deficit or significant canal compromise.

Facet Fractures and Dislocations: Unilateral facet fracture-dislocation produces single-level nerve root compression (radiculopathy) and is the result of combined flexion-rotation. Bilateral facet dislocation — "jumped facets" — is an AO Type C injury caused by pure hyperflexion, produces 50% vertebral body subluxation, and carries high spinal cord injury risk. MRI must be performed before reduction in bilateral facet dislocation to rule out a large disc herniation that would be pushed further into the cord during reduction. Treatment requires surgical reduction and fusion — either posterior lateral mass fixation alone or combined anterior/posterior surgery.

Imaging Workup: CT, MRI, and CT Angiography

CT cervical spine is the primary imaging modality for cervical trauma in all high-energy MVA patients because it identifies fractures missed by plain X-ray in approximately 15% of cases. The NEXUS criteria and Canadian C-Spine Rule are clinical decision rules for plain X-ray screening in low-risk patients, but CT is required for all high-energy mechanisms. Axial, sagittal, and coronal CT reconstructions characterize fracture morphology, identify retropulsed fragments, quantify canal compromise, and assess PLC disruption (indirect evidence on CT: facet subluxation, widened interspinous space, vertebral translation). MRI is obtained secondarily to directly visualize: spinal cord signal change (T2 hyperintensity = cord edema/contusion; hypointensity = hemorrhage = worse prognosis); PLC integrity on STIR sagittal sequences; disc herniation; epidural hematoma; nerve root compression; and vertebral artery flow voids. CT angiography of the cervical vessels must be performed for all C3–C6 fractures involving the foramen transversarium. Flexion-extension X-rays (dynamic stability assessment) are performed at 3–6 months post-injury to detect occult instability in patients treated conservatively — dynamic subluxation on these views establishes ongoing instability independent of bony healing status.

Non-Operative and Surgical Treatment Options

Rigid Cervical Collar: Stable cervical fractures without neurological deficit and with intact PLC are treated in a rigid cervical collar (Philadelphia collar or two-piece rigid collar) for 8–12 weeks. Indicated for Hangman’s Type I, Jefferson fractures with intact transverse ligament, odontoid Type I and III, and stable compression fractures without PLC injury. Serial CT at 6 and 12 weeks confirms fracture healing progression.

Halo Vest / Halo Orthosis: The halo vest provides rigid four-point pin fixation of the skull with a vest attached to rigid uprights, allowing no cervical motion. Indicated for odontoid Type II fractures with moderate non-union risk, Hangman’s Type II (after MRI excludes severe disc injury), and Jefferson fractures with borderline stability. The halo period is 10–16 weeks; CT at completion confirms union or identifies non-union requiring surgery. The daily lived experience of halo vest immobilization — pin site pain, sleep disturbance, inability to drive, showering limitations, social isolation — is an independent element of pain and suffering damages.

C1-C2 Posterior Fusion (Goel-Harms Technique): Posterior C1-C2 instrumented fusion using polyaxial pedicle screws in C2 and lateral mass screws in C1 connected by rods provides the most rigid stabilization of the atlantoaxial complex. Indicated for odontoid non-union, Hangman’s Type III, Jefferson fractures with transverse ligament rupture, and atlantoaxial instability. The procedure permanently sacrifices approximately 50% of total cervical rotation — this quantifiable loss of motion satisfies the permanent consequential limitation category as an objective, measurable impairment at any subsequent IME.

Anterior Cervical Corpectomy and Fusion (ACCF): For burst fractures and teardrop fractures causing significant canal compromise, the standard surgical approach is anterior: removal of the fractured vertebral body and adjacent discs (corpectomy), reconstruction with a structural graft (expandable titanium cage or iliac crest autograft), and anterior cervical plate fixation spanning one level above and below. For multi-level injuries, posterior supplementation with lateral mass or pedicle screw-rod constructs may be required for additional stability.

Anterior Cervical Discectomy and Fusion (ACDF): For cervical fractures with associated disc herniation causing radiculopathy or myelopathy at an adjacent level, ACDF addresses the disc component. ACDF is also performed for some subaxial facet fractures as part of combined anterior-posterior stabilization. Each additional fusion level represents additional lost motion, additional surgical risk, and accelerated adjacent segment disease — all elements of future medical damages.

Anterior Odontoid Screw Fixation: For selected odontoid Type II fractures with favorable geometry (no comminution, transverse fracture line), anterior odontoid screw fixation directly stabilizes the fracture with a single screw without sacrificing atlantoaxial rotation. The technique requires intact transverse ligament and is not appropriate for oblique fracture lines, comminuted fractures, or delayed presentation. Union rates of 80–90% are reported in well-selected patients.