Types of Spinal Trauma
Understanding the type of injury is crucial for appropriate treatment
Spinal trauma can be classified by the type of fracture, the mechanism of injury and, most importantly, by whether or not there is involvement of the spinal cord or nerve roots. This distinction is critical because it determines the urgency, the type of treatment and the prognosis.
Vertebral Fractures by Type
💥 Compression Fractures
Most Common - 40-50%Collapse of the vertebral body from axial loading
Features:
- Loss of height in the anterior portion of the vertebral body
- The posterior wall remains intact (spinal canal protected)
- Typically stable if height loss is <50%
- Most common in the thoracic spine and thoracolumbar junction
Common Causes:
- Falls from a height landing on the feet or buttocks
- Osteoporosis in the elderly (minimal trauma)
- Car accidents
- Sports injuries (gymnastics, diving)
Prognosis: Generally good with conservative treatment if stable. Low neurological risk.
In osteoporotic compression fractures, vertebroplasty and kyphoplasty can stabilize the vertebra and relieve pain percutaneously.
💣 Burst Fractures
High Energy - Neurological RiskFragmentation of the vertebral body with retropulsion into the canal
Features:
- Collapse of the ENTIRE vertebral height (anterior and posterior)
- Bone fragments invade the spinal canal
- Involvement of the posterior column (pedicles, laminae)
- HIGH risk of neurological injury
- Frequently unstable
Mechanism:
- Very high-energy axial loading
- Falls from a great height
- High-speed car accidents
- Direct impacts to the back
URGENT: Requires immediate neurosurgical evaluation. Frequently needs surgery.
🔀 Fracture-Dislocations
Maximum Severity - EmergencyDisplacement of one vertebra over another with ligamentous rupture
Features:
- Complete loss of vertebral alignment
- Rupture of ligaments and discs
- Highly unstable
- VERY high likelihood of spinal cord injury (>80%)
- Requires urgent reduction and stabilization
Mechanism:
- Flexion-rotation or hyperextension forces
- High-speed accidents
- Ejection from vehicles
- Blast injuries
CRITICAL: The most serious injury. Requires emergency surgery. High risk of paraplegia or quadriplegia.
⚡ Extension Fractures
Common in the ElderlyRupture of the posterior elements from hyperextension
Features:
- Mainly affects the cervical spine
- Fracture of the laminae and spinous processes
- Can cause central cord syndrome
- Common in older adults with spondylosis
Typical Mechanism:
- Backward fall striking the forehead/face
- Whiplash from a rear-end impact
- Diving accidents in shallow water
📊 Epidemiology of Spinal Trauma
- Incidence:~160,000 traumatic vertebral fractures per year in the U.S.
- Most affected ages: Bimodal - young people (15-30 years) from high-energy trauma, and the elderly (>65 years) from falls with osteoporosis
- Sex: Men 4:1 in high-energy trauma
- Spinal cord injury: Occurs in 10-20% of vertebral fractures
- Most common level: Thoracolumbar junction (T12-L2) - the transition zone between the rigid and the flexible spine
- Associated injuries: 40-50% have other injuries (head, chest, abdomen)
Mechanisms of Injury: How Spinal Trauma Happens
Understanding the mechanism helps predict the type and severity of the injury
The mechanism of trauma is essential to understanding what type of injury may have occurred. Emergency services and neurosurgeons will always ask in detail how the accident happened, since this guides the evaluation and the imaging studies that are needed.
🚗 Car Accidents
Cause #1 - 40-50%The most frequent cause of severe spinal trauma
Types of Impact:
- Frontal impact: Flexion mechanism, thoracolumbar fractures
- Rear impact: Whiplash, hyperextension
- Side impact: Flexion-rotation injuries
- Rollover: Multiple mechanisms, complex injuries
Risk Factors:
- Not wearing a seat belt (increases risk 2-3x)
- Ejection from the vehicle
- High speed (>60 km/h)
- Major deformation of the vehicle
- Fatalities in the same vehicle
🏃 Falls
Cause #2 - 20-30%The most common cause in older adults
From a Height (High Energy):
- >3 meters: High risk of fracture
- Workplace accidents (construction)
- Falls from ladders or roofs
- Typically burst or compression fractures
From Ground Level (Low Energy):
- Common in the elderly with osteoporosis
- Compression fractures
- Can occur with minimal trauma
- High risk of multiple fractures
⚽ Sports Injuries
10-15% of CasesHigh-risk sports require special caution
High-Risk Sports:
- American Football: Tackles, collisions
- Rugby: Collapsed scrum
- Diving: Striking the bottom of the pool
- Gymnastics: Falls on landing
- Horseback Riding: Falls from a horse
- Cycling: High-speed falls
- Skiing/Snowboarding: Direct impacts
Common Mechanisms:
- Direct axial loading on the head
- Forced hyperflexion or hyperextension
- Violent rotation of the spine
🔫 Violence/Penetrating
10-15% in Urban Areas- Gunshot wounds
- Stab wounds
- Direct spinal cord injury
- High risk of infection
- Frequently complete neurological deficit
🏊 Diving
Severe Cervical Injury- Diving into shallow water
- Head striking the bottom
- Cervical fracture-dislocation
- High risk of quadriplegia
- Typically C5-C6
🏗️ Workplace Accidents
Variable- Falls at construction sites
- Heavy objects falling on the back
- Machinery accidents
- Crush injuries
⚠️ Biomechanical Forces and Injury Patterns
The type of force determines the fracture pattern:
- Axial compression: Compression or burst fractures (falls, vertical impacts)
- Flexion: Anterior compression fractures (frontal crashes while wearing a seat belt)
- Extension: Fractures of the posterior elements (whiplash, backward falls)
- Flexion-rotation: Fracture-dislocations (side impacts, rollovers)
- Distraction: Ligamentous rupture, Chance fractures (lap belt only, no shoulder belt)
Emergency Evaluation: The Critical First Hours
Appropriate initial management can prevent devastating secondary injuries
The initial evaluation of a patient with spinal trauma begins at the scene of the accident and continues in the emergency department. Every step must be performed precisely to avoid additional injury to the spinal cord.
🚑 Pre-Hospital Phase (Scene of the Accident)
Goals: Immobilization and safe transport
- Spinal protection: Assume a spinal injury until proven otherwise
- Cervical immobilization: Rigid cervical collar immediately
- Spine board: Complete immobilization of the entire spine
- Maintain alignment: Avoid rotation, flexion, or extension
- ABC (Airway, Breathing, Circulation): Always the priority
- Rapid neurological assessment: Can the patient move the limbs? Is there sensation to touch?
- Rapid transport: To a center with 24/7 neurosurgical capability
CRITICAL: Improper movements in this phase can turn an incomplete injury into a complete one.
🏥 Emergency Room (First Hour)
Goals: Stabilization and rapid diagnosis
- Primary survey (ATLS): Airway, breathing, circulation, neurological disability
- Maintain immobilization: Until a spinal injury is ruled out
- Complete neurological exam: Strength, sensation, and reflexes in all limbs
- Spinal shock vs. neurogenic shock: Distinguish the causes of hypotension
- URGENT imaging: X-rays, CT, MRI according to findings
- Assessment of associated injuries: Head, chest, and abdominal trauma
🔬 Imaging Studies (First 2-4 Hours)
Diagnostic sequence based on the level of suspicion
- CT of the entire spine: First-line study in high-energy trauma
- X-rays: Only if minor trauma and the patient is alert without neurological symptoms
- Urgent MRI: If there is a neurological deficit or suspicion of ligamentous injury
- CT angiography: If a vascular injury is suspected (high cervical fractures, fracture-dislocations)
⚕️ Treatment Decision (4-8 Hours)
Urgent surgery vs. conservative treatment
- Neurosurgical evaluation: Stability, neurological involvement, reducibility
- Emergency surgery: If there is spinal cord compression or a progressive neurological deficit
- Urgent surgery (24-48h): Unstable fractures, partial neurological deficit
- Conservative treatment: Stable fractures without neurological involvement
Emergency Neurological Examination
Systematic Level-by-Level Assessment
Determining the neurological level of the injury:
- Muscle strength: 0-5 scale in key muscles
- Sensation: Light touch and pinprick in the dermatomes
- Reflexes: Biceps, triceps, patellar, Achilles
- Sphincter tone: Rectal exam (voluntary anal tone)
- Bulbocavernosus reflex: Indicates whether spinal shock has resolved
- Priapism: In men, indicates spinal cord injury
ASIA Scale (American Spinal Injury Association)
Standard international classification of spinal cord injury:
| ASIA Grade | Description | Motor Function | Sensory Function | Prognosis |
|---|---|---|---|---|
| A - Complete | Complete injury | Absent below the neurological level | Absent below the neurological level | Poor (5% recover) |
| B - Incomplete | Sensory preserved | Absent | Preserved, including S4-S5 | Moderate (20-30% improve) |
| C - Incomplete | Motor preserved | Present but mostly <3/5 | Preserved | Good (50-60% functional walking) |
| D - Incomplete | Motor functional | Mostly ≥3/5 | Preserved | Very good (75-90% walking) |
| E - Normal | Normal | Normal | Normal | Complete |
Importance: The initial ASIA classification predicts prognosis and guides treatment decisions. It should be documented within the first 24-48 hours after the trauma.
🚨 Warning Signs That Require IMMEDIATE Intervention
- Worsening neurological deficit: Indicates progressive spinal cord compression
- Sudden loss of function that was present: May indicate displacement of the fracture
- Respiratory failure: High cervical injuries (C1-C4)
- Neurogenic shock: Hypotension with bradycardia (high cervical/thoracic injury)
- Priapism: A sign of spinal cord injury in men
- Ascending sensory level: An expanding spinal epidural hematoma
Spinal Stability vs. Instability
A crucial distinction that determines treatment
Not every vertebral fracture requires surgery. The fundamental decision revolves around the concept of stability. A stable fracture can be treated with external immobilization (brace, collar), while an unstable fracture requires surgical stabilization to prevent neurological injury or progressive deformity.
The Three-Column Concept (Denis)
A Fundamental Classification for Assessing Stability
The spine is conceptually divided into three columns:
Anterior Column
- Anterior longitudinal ligament
- Anterior half of the vertebral body
- Anterior half of the disc
Middle Column
Most Important- Posterior half of the vertebral body
- Posterior half of the disc
- Posterior longitudinal ligament
This column forms the anterior wall of the spinal canal. Its involvement indicates HIGH neurological risk.
Posterior Column
- Pedicles
- Laminae
- Spinous processes
- Facet joints
- Ligaments (interspinous, supraspinous, ligamentum flavum)
Principle of Stability:
- Fracture of ONE column: Generally STABLE
- Fracture of TWO columns: Potentially UNSTABLE (depends on which ones)
- Fracture of THREE columns: UNSTABLE - requires surgical stabilization
Special attention: Involvement of the MIDDLE column always indicates greater severity and potential instability.
Criteria for Instability
Acute (Mechanical) Instability
Risk of DisplacementRisk that the fracture will displace with normal movements:
- Loss of >50% of vertebral body height
- Angulation >20° (kyphosis)
- Involvement of the posterior column (torn ligaments)
- Fracture-dislocations
- Translation (lateral displacement) >3mm
- Bilateral pedicle involvement
- Widening of the interspinous space (ligamentous rupture)
Neurological Instability
Risk of Spinal Cord InjuryCurrent involvement or risk of neurological injury:
- Neurological deficit present
- Canal stenosis >50% (retropulsed bone fragments)
- Spinal cord compression on MRI
- Intramedullary signal change (spinal cord contusion)
- Progressive neurological deficit (worsening)
| Type of Fracture | Stability | Typical Treatment | Immobilization |
|---|---|---|---|
| Anterior compression <50% height | Stable | Conservative | Brace/observation |
| Anterior compression >50% height | Potentially unstable | Depends on other factors | Brace or surgery |
| Burst without neurological deficit | Mechanically unstable | Variable - surgery frequent | Molded brace or surgery |
| Burst with neurological deficit | Completely unstable | Urgent surgery | Decompression + fixation |
| Fracture-dislocation | Completely unstable | Emergency surgery | Immediate reduction + fixation |
| Transverse process fracture | Stable | Conservative | Analgesia, rest |
Spinal Cord Injuries: The Most Devastating Complication
Understanding the mechanisms of spinal cord injury and therapeutic windows
The spinal cord is the communication "highway" between the brain and the rest of the body. When it is injured, the consequences can be catastrophic and frequently permanent. However, not every spinal cord injury is complete, and there are therapeutic windows in which rapid intervention can make a significant difference.
Fracture-dislocations and complex spinal cord injuries often require open spine surgery to decompress and reconstruct the affected segment.
⏰ The Therapeutic Window in Spinal Cord Injury
The concept of the "golden hour" in spinal cord trauma:
- Primary injury: Immediate mechanical damage at the moment of trauma (irreversible)
- Secondary injury: A cascade of events that worsen the damage (partially reversible)
- 8-24 hour window: Surgical decompression can improve the prognosis
- Maintaining perfusion: Mean arterial pressure >85-90 mmHg is critical
Complete vs. Incomplete Injury
Complete Spinal Cord Injury (ASIA A)
Guarded PrognosisTotal absence of motor and sensory function below the level of injury, including the sacral segments (S4-S5)
Features:
- No sensation in the sacral dermatomes
- No voluntary anal contraction
- Complete absence of voluntary movement
- Absence of bulbocavernosus reflexes initially (spinal shock)
Prognosis:
- If it remains ASIA A after 72 hours: <5% recover useful function
- Greater likelihood of recovery if it is incomplete at the outset
- Recovery of one neurological level is possible
- Requires intensive rehabilitation
Incomplete Spinal Cord Injury (ASIA B-D)
Better PrognosisPreservation of some motor or sensory function below the neurological level, including the sacral segments
Indicators of Incompleteness:
- Sacral sparing: Sensation in S4-S5 or voluntary anal contraction
- Any voluntary movement below the neurological level
- Any preserved sensation
Prognosis:
- ASIA B: 20-30% improve to functional walking
- ASIA C: 50-60% achieve walking with assistance
- ASIA D: 75-90% achieve independent walking
- Better prognosis if there is improvement within the first 72 hours
Incomplete Spinal Cord Syndromes
Central Cord Syndrome
Most Common in the ElderlyDisproportionately greater weakness in the arms than in the legs
- Mechanism: Hyperextension in a spondylotic spine
- Affects the central fibers of the cord (arms)
- Legs relatively preserved
- Variable neurogenic bladder
- Prognosis: Good - most recover walking
Brown-Séquard Syndrome
Better PrognosisCord hemisection: ipsilateral weakness, contralateral sensory loss
- Mechanism: Penetrating wounds, lateral bone fragments
- Weakness on the same side as the injury
- Loss of pain/temperature sensation on the opposite side
- Prognosis: >90% recover functional walking
Anterior Cord Syndrome
Worst PrognosisInjury to the anterior spinal artery: paraplegia with preservation of proprioceptive sensation
- Complete loss of motor function
- Loss of pain and temperature sensation
- Preservation of proprioception and vibration
- Prognosis: Poor - <10-20% recover walking
Conus Medullaris Syndrome
Level T12-L2Injury to the conus medullaris: prominent bladder/bowel dysfunction
- Symmetric weakness of the legs
- "Saddle" sensory loss
- Early bladder and bowel dysfunction
- Can be confused with cauda equina
- Post-traumatic cauda equina syndrome is an emergency that must also be ruled out
🔬 Pathophysiology of Secondary Injury
Understanding the secondary injury cascade justifies early interventions:
- Ischemia: Reduced perfusion from hypotension or compression
- Edema: Swelling of the cord worsens compression
- Inflammation: Release of toxic cytokines
- Excitotoxicity: Excessive release of glutamate
- Apoptosis: Programmed cell death
Strategies to limit secondary injury:
- Maintain mean arterial pressure >85-90 mmHg
- Early surgical decompression (<24 hours if possible)
- Avoid hypoxia (adequate oxygenation)
- Temperature control (avoid hyperthermia)
- Careful glucose management
Whiplash: Not Always "Mild"
A common injury that can have lasting consequences
Whiplash is a frequently underestimated injury that occurs when the head and neck move violently back and forth (or sideways) during an impact. Although most cases resolve, some patients develop significant chronic symptoms.
Mechanism of Injury
Typical sequence in a rear-end collision:
- Phase 1 (0-50 ms): The vehicle is pushed forward, the spine assumes an S-shape
- Phase 2 (50-100 ms): Hyperextension of the neck
- Phase 3 (100-150 ms): Rebound forward
- Phase 4 (150-300 ms): Hyperflexion (if there is no headrest)
Structures Affected:
- Cervical ligaments (sprain)
- Neck muscles (spasm, microtears)
- Intervertebral discs (possible herniation)
- Facet joints (contusion, inflammation)
- Nerves (stretching, irritation)
Severity Grades (Quebec Task Force)
| Grade | Findings |
|---|---|
| 0 | No symptoms, no physical signs |
| I | Neck pain, stiffness, tenderness. No physical signs |
| II | Neck pain + musculoskeletal signs (limited range, pain on palpation) |
| III | Neck pain + neurological signs (weakness, diminished reflexes, sensory deficit) |
| IV | Neck pain + fracture or dislocation |
Symptoms and Course
Acute Symptoms (First Days to Weeks)
- Neck pain: May not appear until 24-48 hours later
- Stiffness: Limited range of motion
- Headache: Typically occipital
- Dizziness or vertigo: From vestibular involvement
- Shoulder and arm pain: Radiation
- Paresthesias: In the arms and hands
Late/Chronic Symptoms (After 6 Months)
10-25% of patients develop chronic symptoms:
- Chronic neck pain: Persistent or recurrent
- Chronic headaches: Tension-type or cervicogenic
- Cognitive difficulties: Problems with concentration and memory
- Psychological disturbances: Anxiety, depression (common)
- Sleep disturbances: Insomnia, non-restorative sleep
- Chronic fatigue: Significant functional limitation
⚠️ Risk Factors for Becoming Chronic
Predictors of progression to chronic symptoms:
- Severe initial pain:>6/10 on the visual scale
- Rapid onset of symptoms: Pain within the first few hours
- Neurological symptoms: Paresthesias, weakness
- High-speed collision:>35 km/h
- Unanticipated impact: Not braced for the impact
- History of neck pain: Pre-existing problems
- Psychosocial factors: Stress, anxiety, pending litigation
Evaluation and Treatment
Initial Evaluation
- Clinical decision rules (Canadian C-Spine): Determine the need for imaging
- Imaging: X-rays if criteria are positive, CT if high-energy trauma
- MRI: If there are neurological symptoms or suspicion of a herniated disc
- Complete neurological exam: Rule out neurological injury
Treatment
- Early mobilization: Short rest (48-72h), then gradual activity
- Physical therapy: Range-of-motion exercises, strengthening
- Analgesics: Acetaminophen, NSAIDs
- Muscle relaxants: If there is significant spasm
- Avoid prolonged collar use:>72 hours delays recovery
- Multidisciplinary approach: If it becomes chronic
Treatment: Conservative vs. Surgical
The decision must be individualized according to stability, neurological deficit, and patient factors
The treatment of traumatic vertebral fractures has evolved significantly. Today there is a balance between conservative treatment for stable fractures and surgery for unstable fractures or those with neurological involvement.
In unstable fractures, surgical decompression and stabilization restores alignment and protects the neurological structures, usually through fixation with screws and rods that return stability to the spine.
| Clinical Situation | Treatment of Choice | Urgency | Goal |
|---|---|---|---|
| Stable fracture without neurological deficit | Conservative (brace, analgesia) | Not urgent | Healing, pain control |
| Unstable fracture without neurological deficit | Elective surgery (24-72h) | Urgent | Stabilization, prevent deficit |
| Spinal cord compression with progressive deficit | Emergency surgery (<8h) | EMERGENCY | Decompression, preserve function |
| Fracture-dislocation | Urgent surgery (<24h) | EMERGENCY | Reduction, decompression, stabilization |
| ASIA A spinal cord injury >48h | Surgery within 24-48h | Urgent | Stabilization, facilitate rehabilitation |
💪 Rehabilitation: The Most Important Process
Regardless of whether the treatment was conservative or surgical, rehabilitation is essential for recovery:
- Early start: As soon as it is medically safe
- Multidisciplinary: Physical therapy, occupational therapy, psychological support
- Realistic goals: Set according to the level and completeness of the injury
- Prevention of complications: Pressure ulcers, contractures, infections
- Adaptation and assistive technology: Wheelchairs, orthoses
- Social and vocational reintegration: Return to meaningful activities