Jefferson Fracture

Sir Geoffrey Jefferson described the injury in 1920: a burst fracture of the atlas from axial compression. C1 is a ring with thin anterior and posterior arches, and when it is compressed between the skull and C2 it is the ring that gives way.

Who. Atlas fractures are approximately 11% of all cervical fractures (Lyons & Mian 2022). The contemporary population is bimodal but increasingly geriatric, with a mean age of about 71 years and the majority over 70, and low-energy falls are now the leading mechanism; the high-energy axial-load burst remains the classic young-patient pattern. Over half are non-isolated injuries, and neurological injury is rare in a pure Jefferson fracture.

Mechanism. An axial load to the vertex:

• Diving into shallow water, head first
• A fall onto the top of the head
• A head-first motor vehicle accident with vertex impact
• An object falling onto the head

Why neurological injury is rare. The classic Jefferson fracture displaces the lateral masses outward, which increases the space available for the cord; translational injuries, by contrast, compromise the canal. "Jefferson expands, Hangman's translates" is the rule, and the neurological injury rate is about 10%.

The atlas. C1 is unique among cervical vertebrae, and its structure explains both the fracture and its assessment:

The transverse atlantal ligament. The TAL is the most important structure for C1-C2 stability: a strong band running between the lateral masses, passing posterior to the dens and holding it against the anterior arch. It is part of the cruciform ligament complex and is the primary restraint to anterior translation of C1, while still allowing C1 to pivot around the dens in rotation. With the ligament intact the atlantodental interval is under 3mm in an adult; rupture lets the ADI increase, and an intact TAL is what makes a Jefferson fracture a stable injury.

How the ring breaks. Axial load to the vertex passes through the occipital condyles onto the wedge-shaped lateral masses of C1 and forces them apart. The ring fails at its weakest points, the anterior and posterior arches, the lateral masses displace outward, and if the displacement is severe the TAL may rupture or avulse.

History. The mechanism is an axial load to the vertex, in one of the forms listed in the Overview. The patient complains of occipital or suboccipital neck pain, headache and limited range of motion; neurological symptoms are rare with an isolated Jefferson fracture.

Examination. Maintain cervical spine immobilisation until the spine is cleared, and complete the ATLS primary survey before the focused spine examination. Then:

• Inspection: cervical collar in place, head position
• Palpation: posterior midline tenderness (C1 is not directly palpable)
• Neurological: full motor and sensory examination, cranial nerves
• Vascular: assess for vertebral artery injury if the fracture is displaced

Canadian C-Spine Rule. A Jefferson fracture typically presents with a dangerous mechanism (diving, a fall from height), neck pain and tenderness, and an inability to actively rotate the neck 45 degrees, so imaging is indicated.

Plain radiographs. Two views carry the information:

• Open-mouth (odontoid) view: essential for measuring lateral mass displacement. The edges of the C1 lateral masses are compared with those of C2 and the overhang on each side is summed.
• Lateral cervical radiograph: the atlanto-dental interval (normal under 3mm in adults and under 5mm in children), prevertebral soft tissue swelling and C1-C2 alignment.

CT is the gold standard for delineating the fracture. It shows the pattern (bilateral arch fractures), the number and location of the fracture lines, lateral mass displacement more accurately than a radiograph, associated fractures of C2 and the occipital condyles, and any bone avulsed from the TAL insertion. What it cannot do is show the ligament: ligamentous injury is not assessed, subtle instability may be missed, the findings must be correlated with the clinical examination, and MRI is needed for the TAL.

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MRI is the gold standard for TAL integrity: it visualises the ligament directly and distinguishes a bony avulsion from a midsubstance tear. Indications:

• Combined LMD approaching or exceeding 6.9mm
• ADI greater than 3mm
• Any concern for ligamentous instability
• Neurological deficit
• Planning for definitive management

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The rule of Spence. Lateral mass displacement is measured on the open-mouth view or on coronal CT:

1. Measure the overhang of the C1 lateral mass beyond C2 on each side
2. Add the two measurements to give the combined LMD
3. Greater than 6.9mm (or 7mm): the TAL is likely incompetent
4. Less than 6.9mm does not exclude TAL injury; clinical correlation is needed

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Not every C1 fracture is a Jefferson fracture. The spectrum, and what each pattern means for stability:

The atlas rarely breaks alone. Around 40-50% of Jefferson fractures have an associated C2 injury, most commonly a type II odontoid fracture, with hangman's (C2 pars) and C2-body fractures also seen, and there are recognised combined atlas-axis patterns. Combined C1-C2 injuries are more unstable and have worse outcomes than either alone, and they may alter management significantly, so CT of the entire cervical spine is mandatory.

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Occipital condyle fractures. Type I is comminuted and stable, type II is a basilar skull extension, and type III is an avulsion and unstable. Include the skull base in the CT, and use MRI for ligamentous injury.

Vertebral artery injury. The risk rises with displaced fractures and with involvement of the foramen transversarium. The injury may be asymptomatic initially and carries a stroke risk if unrecognised, so CTA screening is indicated; consider it whenever the fracture involves the transverse foramen.

The decision. Management turns on the integrity of the TAL and on the most unstable associated injury. Maintain immobilisation, complete the trauma and neurological assessment, exclude associated injuries, and then sort the fracture by its ligament: an intact TAL is treated in a rigid collar, a Dickman type II bony avulsion may be given a trial of halo, and a Dickman type I midsubstance rupture is fused. The Dickman evidence card below puts the halo trial in proportion: 74% of type II injuries healed in a rigid orthosis and roughly one in four came to delayed surgery, which is why the halo is a monitored trial rather than a promise.

Algorithm

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Non-OperativeSurgicalTechniques

Who. An isolated Jefferson fracture with an intact TAL, a combined LMD under 6.9mm with an MRI-confirmed intact TAL, and selected Dickman type II bony avulsions.

Rigid cervical collar

Duration

8-12 weeks

Indications

Stable fracture, TAL intact

Considerations

Most common, patient-friendly

Halo vest

Duration

8-12 weeks

Indications

Unstable pattern, TAL avulsion

Considerations

Better immobilization, patient tolerance issues

Soft collar

Duration

Not recommended

Indications

None for acute fracture

Considerations

Insufficient immobilization

Non-Operative Treatment Options

Method	Duration	Indications	Considerations
Rigid cervical collar	8-12 weeks	Stable fracture, TAL intact	Most common, patient-friendly
Halo vest	8-12 weeks	Unstable pattern, TAL avulsion	Better immobilization, patient tolerance issues
Soft collar	Not recommended	None for acute fracture	Insufficient immobilization

Who. The indications for surgery:

• TAL midsubstance rupture (Dickman type I)
• Halo not tolerated or contraindicated
• Associated unstable C2 fracture
• Failed non-operative treatment
• Persistent instability at follow-up

The options. C1-C2 fusion, by the Gallie, Brooks or Magerl technique or the Goel-Harms screw-rod construct, is the accepted standard for the unstable injury and has high fusion rates. The price is the atlantoaxial joint: fusion eliminates C1-C2 rotation, which is 50% of cervical rotation, with consequences for driving, sport and work that the patient should hear before surgery. Occipitocervical fusion extends the construct to the skull when there is an associated occipital condyle fracture, basilar invagination or severely comminuted lateral masses, at the cost of greater motion loss. Direct fixation of the ring with C1 lateral mass screws is a newer, technically demanding technique that is not widely adopted; it may preserve motion if combined with TAL healing, and it is set out under Surgical Technique.

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Children. An ADI up to 5mm may be normal, synchondroses can mimic fractures, and a higher proportion have TAL injuries, so consider MRI more liberally.

Choosing the fusion. Goel-Harms is the current gold standard and has largely replaced the wiring techniques. It gives rigid segmental fixation without supplemental halo immobilisation, it is modular, it allows intraoperative reduction of atlantoaxial subluxation, and with a proper trajectory its C2 screws avoid passing the vertebral artery, the risk carried by transarticular screws. The step-by-step technique is in the next section.

Gallie

Method

Posterior wiring + sublaminar cable + graft

Advantages

Simple, familiar

Disadvantages

Requires supplemental halo, rotational instability

Brooks-Jenkins

Method

Bilateral sublaminar cables + bone grafts

Advantages

Better rotational control than Gallie

Disadvantages

Risk to neural elements with cable passage

Magerl (Transarticular screws)

Method

C1-C2 transarticular screws + posterior fusion

Advantages

Rigid fixation, high fusion rate

Disadvantages

Vertebral artery at risk, technically demanding

Goel-Harms

Method

C1 lateral mass + C2 pedicle screws + rods

Advantages

Avoids vertebral artery with C2 screws, modular

Disadvantages

Technically demanding, C2 nerve root at risk

Wright (C2 pars screws)

Method

C1 lateral mass + C2 pars interarticularis screws

Advantages

Alternative to pedicle screws

Disadvantages

Shorter screw purchase

C1-C2 Fusion Techniques

Technique	Method	Advantages	Disadvantages
Gallie	Posterior wiring + sublaminar cable + graft	Simple, familiar	Requires supplemental halo, rotational instability
Brooks-Jenkins	Bilateral sublaminar cables + bone grafts	Better rotational control than Gallie	Risk to neural elements with cable passage
Magerl (Transarticular screws)	C1-C2 transarticular screws + posterior fusion	Rigid fixation, high fusion rate	Vertebral artery at risk, technically demanding
Goel-Harms	C1 lateral mass + C2 pedicle screws + rods	Avoids vertebral artery with C2 screws, modular	Technically demanding, C2 nerve root at risk
Wright (C2 pars screws)	C1 lateral mass + C2 pars interarticularis screws	Alternative to pedicle screws	Shorter screw purchase

Vertebral artery injury complicates 2-4% of screw placements, more often with C2 transarticular screws and less often with the Goel-Harms technique, and may require intraoperative vascular surgery.

C5 nerve root palsy presents as shoulder abduction weakness. It is rare but recognised and typically transient; the mechanism is unclear (traction versus cord shift), and most recover with physiotherapy by 6-12 months.

Infection. Deep wound infection occurs in 1-3%, more often in polytrauma. It is treated with prolonged antibiotics, hardware removal may be needed if it becomes chronic, and fusion can still occur.

Hardware failure. Screw loosening or breakage is usually related to non-union and may require revision surgery. Prevention is good bone quality, and augmentation options are available.

The first 24-48 hours. ICU or step-down unit monitoring with neurological checks every 2-4 hours. The cervical collar stays on even after fusion, the drain comes out at 24 hours, and mobilisation with physiotherapy and occupational therapy starts early.

Analgesia and prophylaxis. Multimodal analgesia, with opioids as needed initially, a transition to non-opioid agents, neuropathic agents if needed, and no NSAIDs for the first 6 weeks while the fusion heals. DVT prophylaxis is sequential compression devices, early mobilisation and chemical prophylaxis per the trauma protocol, balancing bleeding risk against DVT risk and continuing until the patient is fully ambulatory.

Immobilisation. After C1-C2 fusion the instrumentation provides the stability; a rigid collar for 6-8 weeks adds support during fusion, protects against inadvertent movement and is for comfort rather than primary immobilisation. After collar treatment of a stable fracture the collar is worn continuously for 8-12 weeks, 24 hours a day except for supervised bathing, with the fit checked at each visit and skin care to prevent breakdown; compliance is critical to healing.

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Rehabilitation runs in three phases:

• Phase 1 (0-6 weeks), immobilisation: collar on continuously, no neck movement, upper limb range-of-motion exercises, gentle walking as tolerated, no lifting, bending or twisting
• Phase 2 (6-12 weeks), protected mobilisation: continue the collar if non-operative, wean it if operative and the fusion is progressing; gentle isometric neck exercises; a gradual increase in daily activities; no contact sports or high-risk activities
• Phase 3 (3-6 months), active rehabilitation: full range-of-motion exercises once stability is confirmed, strengthening for the neck and shoulder girdle, proprioception training, and a supervised, gradual return to work and sport

Return to activity. Sedentary work can continue in the collar after non-operative treatment and resumes 2-4 weeks after surgery, with an ergonomic workstation, frequent position changes and no prolonged neck flexion. Driving is not allowed in a collar because neck rotation is limited; it resumes once the collar is weaned, range of motion is restored, blind spots can be checked safely and the patient is off narcotic analgesia, typically 3-4 months after injury. Contact sport waits a minimum of 6 months, for a confirmed solid fusion or healed fracture, full range of motion and strength, and an individual risk assessment that weighs the long-term consequences of a fusion.

What to watch for during follow-up:

• Non-union or malunion: persistent pain, motion on flexion-extension views
• Hardware failure: screw loosening or breakage, if operative
• Infection: wound problems, fever, raised inflammatory markers
• C5 nerve root palsy: shoulder weakness
• Chronic pain, which may need a pain management referral
• Adjacent segment degeneration, a long-term concern after fusion

Stable fractures in a collar. Union is 90-95% with a rigid collar, typically complete by 12 weeks, and non-union is rare when the patient is compliant with immobilisation; most achieve solid bony healing with minimal long-term complications. Good to excellent outcomes are likewise 90-95%, with a return to full activity in most cases, minimal residual neck pain, a full cervical range of motion preserved and high patient satisfaction. Expect sedentary work at 2-4 weeks (in the collar), physical work and recreational sport at 3-6 months, contact sport at 6-12 months after confirmed healing, and driving after the collar is removed and range of motion restored.

Unstable fractures fused. Fusion rate, function and motion loss by construct:

After C1-C2 fusion most patients adapt to the lost rotation over 6-12 months, may need to turn the whole body to check blind spots, can still take part in most activities, and satisfaction is generally high, better than living with instability.

Prognosis. No specific prognostic scoring system exists for Jefferson fractures, and more displacement means a higher risk of instability. A good outcome is predicted by:

• Early diagnosis and appropriate treatment
• An isolated Jefferson fracture with no associated injuries
• Compliance with the immobilisation protocol
• Young age and good bone quality
• No neurological injury at presentation

A poorer outcome is predicted by:

• Associated C2 fractures or craniocervical injuries
• Delayed diagnosis or treatment
• Severe displacement requiring surgery
• Polytrauma with multiple comorbidities
• Pre-existing cervical pathology

Left untreated. A stable fracture may heal with fibrous union, and chronic instability is possible. An unstable fracture carries a high risk of progressive C1-C2 instability, and a type I TAL rupture does not heal, so atlantoaxial subluxation progresses. Chronic pain is common with untreated instability, and late myelopathy is its rare but serious complication.

Global Epidemiology

The epidemiology of atlas (C1) fractures has shifted internationally from a young, high-energy pattern toward a predominantly geriatric, low-energy-fall pattern as populations age. The key figures below frame how Jefferson and other atlas fractures present in modern practice.

Guideline Comparison

There is no high-level (Level I) randomised evidence in Jefferson fracture management; international guidance is consensus- and observational-evidence based, but converges on a single principle: treatment is stratified by transverse atlantal ligament (TAL) integrity, not by the bony pattern alone.

Registry and Outcomes Evidence

Unlike arthroplasty, there is no dedicated international Jefferson-fracture implant registry; outcome data derive from national trauma datasets and institutional series. National major-trauma registries (for example the Trauma Audit and Research Network in the UK, and the Australia & New Zealand Trauma Registry) capture cervical spine injuries and support benchmarking of process and outcome across trauma systems. Large administrative databases (such as the US National Electronic Injury Surveillance System used by Lyons & Mian 2022) provide the most robust incidence and demographic data.

Imaging and Access Considerations

CT is the global first-line investigation and is near-universally available at trauma centres; the practical bottleneck worldwide is timely MRI for TAL assessment, which is often unavailable out-of-hours or in regional and lower-resource settings. Where MRI is required for borderline Rule of Spence measurements, interfacility transfer or teleradiology-guided triage is commonly used. Driving is restricted while a rigid collar is worn because cervical rotation and blind-spot checking are impaired; return-to-work and return-to-sport timelines are individualised to confirmed healing or fusion.