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Spinal fracture
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Spinal fracture
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Spinal fracture
Other namesVertebral fracture, broken back
Lateral spine X-ray showing osteoporotic wedge fractures of L1/2
CASH Orthosis.

A spinal fracture, also called a vertebral fracture or a broken back, is a fracture affecting the vertebrae of the spinal column. Most types of spinal fracture confer a significant risk of spinal cord injury. After the immediate trauma, there is a risk of spinal cord injury (or worsening of an already injured spine) if the fracture is unstable, that is, likely to change alignment without internal or external fixation.[1]

Types

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Cervical fracture

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Main article: Cervical fracture

A medical history and physical examination can be sufficient in clearing the cervical spine. Notable clinical prediction rules to determine which patients need medical imaging are Canadian C-spine rule and the National Emergency X-Radiography Utilization Study (NEXUS).[4]

The AO Foundation has developed a descriptive system for cervical fractures, the AOSpine subaxial cervical spine fracture classification system.[5]

The indication to surgically stabilize a cervical fracture can be estimated from the Subaxial Injury Classification (SLIC).[6]

Thoracolumbar fracture

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Vertebral fractures of the thoracic vertebrae, lumbar vertebrae or sacrum are usually associated with major trauma and can cause spinal cord injury that results in a neurological deficit.[7]

Thoracolumbar injury classification and severity score

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The thoracolumbar injury classification and severity score (TLICS) is a scoring system to determine the need to surgically treat a spinal fracture of thoracic or lumbar vertebrae. The score is the sum of three values, each being the score of the most fitting alternative in three categories:[8]

Injury type

  • Compression fracture - 1 point
  • Burst fracture - 2 points
  • Translational rotational injury - 3 points
  • Distraction injury - 4 points

Posterior ligamentous complex

  • Intact - 0 points
  • Suspected injury or indeterminate - 2 points
  • Injured - 3 points

Neurology

A TLICS score of less than 4 indicates non-operative treatment, a score of 4 indicates that the injury may be treated operatively or non-operatively, while a score of more than 4 means that the injury is usually considered for operative management.[8]

AOSpine Thoracolumbar Injury Classification System

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AOSpine Thoracolumbar Injury Classification System (ATLICS)[9] is the most recent classification scheme for thoracolumbar injuries.[10] ATLICS is broadly based on the TLICS system and has sufficient reliability irrespective of the experience of the observer.[10] ATLICS is primarily focused on fracture morphology, and has two additional sections addressing the neurological grading and clinical modifiers:[9]

Fracture morphology

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  • Type A: Compression injuries (sub-types A0-A4)
  • Type B: Distraction injuries (sub-types B1-B3)
  • Type C: Translation injuries

Neurological status

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  • N0: neurologically intact
  • N1: transient deficit
  • N2: radiculopathy
  • N3: "incomplete spinal cord injury or cauda equina injury"[9]
  • N4: "complete spinal cord injury"[9]
  • NX: unknown neurological status

Modifiers

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  • M1: unknown tension band injury status
  • M2: comorbidities

Osteoporotic vertebral compression fracture

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Osteoporosis is a condition causing weakening of the bone due to loss of bone substance. Women are about four times more likely to be affected by osteoporosis than men. Osteoporosis may occur after the menopause or as a result of malnutrition, hyperthyroidism, alcoholism, kidney disease. Osteoporosis may occur after treatment with antiepileptic drugs, proton pump inhibitors, antidepressants, corticosteroids or chemotherapy. Osteoporotic vertebral body compression fractures might occur even after minor trauma or while twisting, bending or coughing.

Sacral fracture

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Main article: Sacral fracture

References

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Revisions and contributorsEdit on WikipediaRead on Wikipedia

Spinal fracture

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from Grokipedia
A spinal fracture, also known as a vertebral fracture, is a break or crack in one or more of the bones (vertebrae) that form the spinal column, potentially compromising spinal stability and function. The spine consists of 33 vertebrae divided into the cervical (7), thoracic (12), (5), sacral (5, fused into ), and coccygeal (4, fused into ) regions. It provides structural support for the body, protects the , and enables movement. These fractures can affect any segment of the spine but most commonly occur in the thoracic (mid-back) or (lower back) regions, or at their thoracolumbar junction, and may involve compression, burst, or patterns depending on the mechanism of injury. While many spinal fractures are stable and do not damage the or nerves, unstable ones can lead to neurological complications such as weakness, numbness, or if the is compromised. Spinal fractures result from traumatic injuries, such as high-energy events like collisions or falls, or from pathological conditions like , which weakens bones and leads to compression fractures under normal loads. Risk factors include advanced age, low , cancer, and use. Symptoms often include severe , potential neurological deficits, and deformity. Diagnosis relies on imaging such as X-rays, CT scans, and MRI, while treatment ranges from conservative management with bracing and pain control to surgical stabilization for unstable cases. Prognosis varies, with stable fractures often healing well, though complications like can occur.

Introduction

Definition and overview

A spinal fracture, also known as a vertebral fracture, is a break in one or more of the vertebrae, the bony segments that form the spinal column. These fractures typically arise when forces exceed the structural integrity of the vertebral body, leading to disruption of the spine's alignment, stability, and protective function for the and nerve roots. Such injuries carry significant implications for overall spinal function, often resulting in immediate severe pain, potential deformity like from vertebral collapse, and heightened risk of neurological complications. If the fracture involves retropulsion of bone fragments into the , it can compress the or nerve roots, causing deficits such as sensory loss, motor weakness, or . Beyond acute effects, vertebral fractures are associated with , reduced , and increased mortality risk, particularly in cases linked to underlying conditions like . Spinal fractures have been recognized in medical literature since ancient times, with initial descriptions appearing in the Corpus Hippocraticum by around 400 BCE, who noted the challenges of managing such injuries. Modern comprehension advanced dramatically in the late following Wilhelm Röntgen's discovery of X-rays, which enabled accurate visualization and diagnosis of fractures previously identified only through clinical examination. The scope of spinal fractures encompasses breaks in any of the 33 vertebrae spanning the cervical, thoracic, , sacral, and coccygeal regions, but does not include soft tissue disruptions such as sprains or disc herniations.

Relevant spinal anatomy

The vertebral column, or spine, consists of 33 individual stacked to form a flexible yet sturdy structure that supports the body's weight and protects the . Each typical comprises a thick anterior vertebral body that bears the majority of axial load, connected posteriorly by pedicles to form the vertebral arch, which encloses the . The lamina completes the posterior arch, while the spinous process projects backward for muscle and attachment, and transverse processes extend laterally for similar purposes; superior and inferior articular facets enable controlled movement between adjacent . The spine is divided into four main regions, each with distinct anatomical features influencing mobility and load distribution. The cervical region includes seven vertebrae (C1-C7), characterized by high mobility to support head movements, with larger intervertebral foramina for passage and bifid spinous processes in lower segments. The thoracic region comprises 12 vertebrae (T1-T12), offering limited mobility due to rib articulations that enhance stability and protect thoracic organs, while bearing moderate loads. The lumbar region has five robust vertebrae (L1-L5), designed for substantial weight-bearing with thick bodies and pedicles, allowing greater flexion and extension; below this, the sacral region fuses five vertebrae (S1-S5) into the , providing an immobile base for pelvic attachment and force transmission to the lower limbs. The resides within the vertebral , extending from the to the at approximately L1-L2 in adults, surrounded by and for protection. It is anchored by and gives rise to 31 pairs of spinal s that exit through intervertebral foramina formed by the pedicles. In the lumbar region, the terminates, and the —a bundle of lumbosacral —occupies the lower , resembling a horse's tail and vulnerable to compression in that area. Ligamentous structures provide essential passive stability to the spine, resisting excessive motion and maintaining alignment. The (ALL) runs along the anterior surfaces of the vertebral bodies from the occiput to the , limiting hyperextension and stabilizing the anterior column. The (PLL) lines the posterior vertebral bodies within the canal, from C2 to the , restricting flexion and protecting the from retropulsed fragments. Interspinous ligaments connect adjacent spinous processes, primarily limiting flexion as part of the posterior ligamentous complex and contributing to overall segmental stability.

Epidemiology and risk factors

Incidence and demographics

Spinal fractures, encompassing vertebral compression, burst, and other types, affect millions globally each year. In 2021, the worldwide incidence of vertebral fractures was estimated at 7.5 million cases annually, with a prevalence of 5.4 million. In the United States, approximately 700,000 vertebral compression fractures occur each year, primarily driven by in older adults, though traumatic spinal fractures add to the total burden, with over 150,000 cases reported annually from injury-related causes. Higher rates are observed in the elderly due to conditions like , which weaken bone structure and predispose individuals to fragility fractures. Demographic patterns reveal distinct variations by age and sex. Incidence is elevated among males under 50 years, often linked to high-energy trauma such as accidents, with a peak occurrence in the 20-40 age group from such incidents. In contrast, females over 65 years experience higher rates of osteoporotic compression fractures, with rising steeply with age and affecting up to 20% of women in this group. Overall, vertebral fracture is similar between sexes until advanced age, after which women predominate due to postmenopausal bone loss. Recent data indicate a rising trend in spinal fracture incidence, attributed to aging populations worldwide. From 1990 to 2021, global cases increased by approximately 28%, from 5.9 million to 7.5 million, reflecting demographic shifts toward older age groups. Studies project continued growth, with age-standardized rates stable but absolute numbers climbing in regions with expanding elderly demographics. Regional disparities are notable, with higher incidence in low- and middle-income countries due to elevated trauma from falls and interpersonal , contrasting with osteoporosis-dominant patterns in high-income areas.

Predisposing factors

Medical conditions significantly predispose individuals to spinal fractures by compromising bone integrity or structural stability. , characterized by reduced density, is a primary , as it weakens vertebral bones and increases susceptibility to compression fractures, particularly in postmenopausal women. Metastatic tumors further elevate this risk by invading and eroding vertebral bone, leading to pathological weakening and heightened fracture likelihood in affected patients. Congenital anomalies such as also contribute, as they are associated with low density and elevated fracture rates due to impaired mobility and skeletal development. Lifestyle and behavioral factors play a crucial role in diminishing bone health and balance, thereby heightening spinal fracture vulnerability. Smoking accelerates bone density loss by disrupting calcium absorption and estrogen metabolism, resulting in a dose-dependent increase in vertebral fracture risk. Chronic alcohol abuse similarly impairs bone remodeling and mineralization, fostering osteoporosis and elevating the overall fracture incidence. A sedentary lifestyle exacerbates these effects through progressive muscle weakness, particularly in the extensor muscles supporting the spine, which compromises postural stability and amplifies fall-related fracture risks. Occupational and environmental exposures heighten susceptibility through repeated mechanical stress or increased fall propensity. High-risk occupations, such as construction work and , involve heavy lifting, falls from heights, or high-impact activities that strain the spine, significantly raising injury rates among workers in these fields. In elderly populations, home environments pose particular dangers, where low-level falls—often due to environmental hazards like uneven flooring—frequently result in thoracolumbar spinal fractures, accounting for a substantial portion of geriatric cases. Genetic predispositions influence mass and resilience, independently contributing to vulnerability. A family history of low mass indicates heritable factors accounting for 60-85% of variation, thereby increasing the likelihood of osteoporotic spinal fractures. Conditions like Ehlers-Danlos syndrome, which affect integrity, are linked to markedly higher incidence—up to tenfold—due to joint hypermobility and reduced skeletal stability.

Causes and mechanisms

Traumatic mechanisms

Traumatic spinal fractures commonly arise from high-energy mechanisms that impart significant biomechanical forces to the spine. accidents, accounting for approximately 48% of spinal injuries, frequently involve flexion-distraction forces where rapid deceleration causes the to pivot forward relative to the , stretching and compressing spinal elements. Falls from heights greater than 10 feet represent another major high-energy cause, typically generating axial loading as the body impacts the ground in a vertical orientation, transmitting compressive forces through the vertebral column. Low-energy trauma, such as ground-level falls, predominates in older adults and often results in compression fractures due to the spine's reduced tolerance under even modest vertical loads. These incidents exploit underlying fragility to cause vertebral without extreme application. In the elderly population, such falls from standing height can produce anterior compression through the weight of the upper body shifting forward during impact. Sports activities and acts of violence also contribute to traumatic spinal fractures via targeted force applications. Hyperextension injuries occur in diving accidents when the head strikes shallow water, forcing the into backward bending that tensions anterior structures while compressing posterior ones. Rotational forces in assaults, such as those from blunt impacts or twisting maneuvers, generate shear stresses across the spine, disrupting alignment and stability. From a biomechanical perspective, these mechanisms involve distinct vectors that exceed the spine's structural limits. Flexion , prevalent in forward-bending scenarios, preferentially load the anterior vertebral body, leading to wedge-shaped deformations as the front collapses under . Axial compression vectors, as in vertical falls, distribute downward pressure evenly across the endplates, risking cortical failure and height loss. Distraction and rotational vectors, seen in seatbelt-related or torsional injuries, separate or twist spinal components, compromising ligamentous integrity.

Pathological and non-traumatic causes

Pathological spinal fractures arise from underlying diseases that compromise integrity, leading to vertebral under normal physiological loads or minor stresses, in contrast to those resulting from acute high-energy impacts. These fractures are often insidious in onset and associated with systemic conditions that weaken the vertebral structure through metabolic, neoplastic, infectious, or treatment-related mechanisms. Osteoporotic vertebral compression fractures represent the most prevalent non-traumatic type, occurring due to reduced density that renders vertebrae susceptible to failure from everyday activities like bending or lifting. These fractures typically manifest as wedge-shaped or biconcave deformities in the anterior vertebral body, particularly at the thoracolumbar junction (T12-L2), and are far more common in postmenopausal women owing to accelerated loss from deficiency. Annually, approximately 1 to 1.5 million such fractures occur , with a of about 25% in women over 50 years old. Neoplastic pathological fractures stem from primary bone tumors or, more frequently, metastases that erode vertebral through osteolytic processes, where tumor cells activate osteoclasts to resorb tissue and create structural weaknesses. Common culprits include metastases from (21% of cases), (8%), and (14%) cancers, as well as primary malignancies like , which induces widespread lytic lesions leading to vertebral instability and collapse. The spine is the most frequent site for skeletal metastases, with fractures developing when 51% to 96% of the vertebral cross-sectional area is compromised. Infectious causes, such as vertebral or , result from bacterial, fungal, or mycobacterial invasion of the vertebral body and , causing progressive , bone erosion, and eventual collapse. Pathogens like spread hematogenously via the rich vertebral venous , leading to endplate destruction and disc space narrowing that destabilizes the spine and precipitates fractures, often in immunocompromised individuals. Chronic cases may involve paraspinal abscesses that further exacerbate vertebral instability. Iatrogenic factors contribute to non-traumatic fractures through medical interventions that inadvertently weaken bone. Radiation therapy, particularly high-dose stereotactic body radiotherapy for spinal metastases, induces osteonecrosis and microfractures, with a reported 12.4% incidence of vertebral compression fractures within one year post-treatment, rising to 40% at doses of 24 Gy in a single fraction. Similarly, prolonged corticosteroid use, such as high-dose glucocorticoids for autoimmune conditions, suppresses osteoblast activity and promotes osteoclast-mediated resorption, causing glucocorticoid-induced osteoporosis and vertebral fractures, which is the leading secondary osteoporosis etiology in patients under 50.

Classification systems

Location-based classification

Spinal fractures are classified by their location within the vertebral column, which highlights regional anatomical variations that influence injury susceptibility, stability, and associated risks. This approach emphasizes differences in mobility, supporting structures, and proximity to neural elements across the cervical, thoracic, , and sacral regions. Cervical spine fractures comprise approximately 22% of all spinal fractures and pose a high risk of neurological injury due to the close proximity of the and to the vertebral bodies. The highly mobile nature of the , as referenced in spinal anatomy, contributes to this vulnerability in trauma scenarios. Thoracic spine fractures account for about 30% of cases and are generally more stable owing to the reinforcing effect of the , which enhances structural integrity against flexion, extension, and rotational forces. These fractures often result from high-impact axial loading, though the thoracic region's relative rigidity limits displacement compared to other areas. Lumbar spine fractures are the most prevalent, representing roughly 48% of spinal fractures, primarily due to the transitional zone between the rigid thoracic spine and the more mobile segments, where biomechanical stresses concentrate. This area's greater flexibility and load-bearing role make it prone to injury under compressive or shear forces. Note that exact distributions can vary by study, population, and trauma mechanism. Sacral spine fractures are relatively rare, occurring in approximately 1-5% of spinal fracture cases, and are frequently associated with pelvic trauma, including disruptions to the pelvic ring or . Multilevel fractures, involving more than one spinal region, occur in approximately 15% of cases and complicate management by spanning anatomical transitions with varying stability profiles.

Morphology- and mechanism-based classification

Morphology- and mechanism-based systems for spinal fractures emphasize the structural characteristics of the injury, such as fracture shape and column involvement, as well as the underlying biomechanical forces, to assess stability and guide treatment decisions. These approaches differ from location-based systems by focusing on injury patterns that predict potential , neurological , and the need for surgical intervention, often integrating clinical and radiographic features for a comprehensive . The Denis classification, introduced in 1983, conceptualizes the spine as three columns—anterior (anterior longitudinal ligament and anterior half of the vertebral body), middle (posterior half of the vertebral body and posterior longitudinal ligament), and posterior (posterior elements including the neural arch and ligamentous structures)—to evaluate stability. Injuries involving one column are typically stable, while those affecting two or more columns indicate potential instability, with mechanisms like compression, burst, or distraction determining the pattern. For instance, anterior column compression fractures are common in flexion injuries, whereas burst fractures disrupt both anterior and middle columns due to axial loading. This system has been foundational for thoracolumbar assessments, though it shows moderate reliability in clinical stability prediction. Common mechanisms of spinal fractures are categorized by the primary vectors, aiding in and anticipating associated injuries. Flexion-compression mechanisms, often from forward bending under load, produce wedge or compression fractures primarily affecting the anterior column. Burst fractures result from severe axial compression with flexion, causing retropulsion of bone fragments into the and middle column disruption. Flexion-distraction injuries, such as seat-belt type, involve tension across the posterior elements, leading to tension band failures. Hyperextension mechanisms, prevalent in the cervical spine, can cause anterior column fractures with posterior ligamentous strain, particularly in ankylotic conditions. These categories inform morphology-based systems by linking direction to type and stability. The AO/AOSpine classification system, revised from the original Magerl framework, categorizes thoracolumbar and subaxial cervical injuries into three main types based on morphology and mechanism: Type A (compression injuries without posterior tension band disruption, e.g., or burst fractures), Type B (anterior or posterior tension band injuries, such as chance fractures from ), and Type C (multidirectional with translation or rotation, indicating high-risk displacement). Subtypes provide further granularity, such as A3 for burst fractures or B2 for posterior tension band disruptions. For subaxial cervical injuries, the system incorporates involvement and neurological status as modifiers to refine severity. This comprehensive approach integrates with scoring tools like TLICS for treatment recommendations, demonstrating high interobserver reliability. The Thoracolumbar Injury Classification and Severity (TLICS) score complements morphology-based systems by assigning points across three domains to quantify injury severity and direct management: morphology (compression: 1 point; burst: 2 points; translation/rotation: 3 points; distraction: 4 points), neurological status (intact: 0 points; : 2 points; complete cord: 2 points; incomplete cord: 3 points; : 3 points), and posterior ligamentous complex integrity (intact: 0 points; indeterminate: 2 points; injured: 3 points). A total score of 4 or greater suggests surgical intervention, while scores below 4 favor nonoperative treatment; scores of exactly 4 allow either approach. Developed in 2005, TLICS integrates seamlessly with AO/AOSpine types, enhancing prognostic accuracy for thoracolumbar fractures. Recent advancements include AI-driven models for automated TLICS prediction from imaging, improving efficiency in trauma settings.
TLICS DomainScoring CriteriaPoints
MorphologyCompression1
Burst2
Translational/Rotational3
4
None0
Intact0
2
Complete cord2
Incomplete cord3
3
Posterior Ligamentous ComplexIntact0
Indeterminate2
Injured3
This table summarizes the TLICS scoring components for quick reference in clinical use.

Specific fracture types

Cervical spine fractures

Cervical spine fractures occur in the uppermost portion of the vertebral column, spanning from the occiput to the thoracic junction, and are particularly hazardous due to the region's high mobility, proximity to vital structures like the airway and , and the potential for severe at higher levels. These fractures are common in trauma patients and account for approximately 30-40% of traumatic spinal fractures, with a notable risk of neurological compromise owing to the narrower in this area. The cervical spine's vulnerability stems from its role in supporting head movement while protecting the , making injuries here often result from high-impact trauma and carry risks of immediate life-threatening complications such as or quadriplegia. Prevalence data indicate that approximately 30% of cervical spine fractures involve the C1-C2 segment, which is critical for head rotation and stability, while neurological involvement occurs in 12-50% of cases, ranging from radiculopathy to complete spinal cord injury. Common mechanisms include hyperextension injuries, such as those in motor vehicle whiplash or falls, and axial loading from diving or direct impacts, which can propagate forces through the delicate upper vertebrae. For instance, Jefferson fractures of C1 result from vertical axial loads that burst the atlas ring, often seen in diving accidents, leading to lateral mass displacement. Hangman's fractures involve bilateral pedicle disruptions of C2, typically from hyperextension with distraction as in judicial hangings or rear-end collisions, causing anterior subluxation of C2 on C3. Teardrop fractures, characterized by an anterior inferior body fragment resembling a teardrop, arise from severe flexion injuries with axial compression, commonly in the lower cervical spine from hyperflexion trauma. Stability concerns are paramount in cervical fractures, particularly with disruptions that compromise ligamentous integrity and risk . , a catastrophic from high-energy deceleration, involves separation of the occiput from C1 and is often fatal due to brainstem involvement, though survivors face profound requiring immediate stabilization. Odontoid fractures of C2, classified into Type I (avulsion of the dens tip, stable), Type II (waist fracture, prone to ), and Type III (extending into the vertebral body, generally stable), result from various mechanisms including flexion, extension, or , with Type II being the most common and associated with displacement risks in older patients. These fractures highlight the need for precise assessment of ligamentous damage, as intact transverse atlantal in Jefferson fractures may preserve stability, whereas disruption demands surgical consideration to prevent chronic or neurological deterioration.

Thoracolumbar spine fractures

Thoracolumbar spine fractures occur in the region spanning the lower (T10-T12) to the upper (L1-L2), representing a transitional zone where the relatively rigid thoracic spine meets the more mobile lumbar spine, making it biomechanically vulnerable to injury during axial loading or flexion forces. This junction accounts for approximately 60-70% of all thoracolumbar fractures, with T12-L1 being the most common site due to the abrupt change in spinal curvature and mobility that acts as a fulcrum for stress concentration in traumatic events such as falls or accidents. These fractures are often stable if isolated to the anterior column but can compromise stability when involving posterior elements, leading to potential kyphotic if untreated. Common types include compression fractures, characterized by anterior wedge deformation of the vertebral body without posterior wall involvement; burst fractures, which result from higher-energy axial compression causing retropulsion of bony fragments into the ; and Chance fractures, flexion-distraction injuries that traverse bone and/or soft tissues across the vertebral body and posterior elements, often associated with seatbelt use in vehicular trauma. Compression fractures typically affect the anterior column and are the most frequent, comprising up to 50% of thoracolumbar injuries, while burst fractures occur in about 15-20% of cases and pose a higher risk of canal compromise. Chance fractures, though less common at around 5%, are notable for their transverse orientation and potential to disrupt the posterior ligamentous complex (PLC). Classification systems like the Thoracolumbar Injury Classification and Severity (TLICS) score and the AO Spine system guide management by assessing morphology, PLC integrity, and neurology. In TLICS, compression fractures score 1 point for morphology (or 2 for burst), with intact PLC adding 0 points and normal neurology 0 points, yielding a total under 4 that favors nonoperative treatment; conversely, a burst fracture with suspected PLC injury (3 points) and incomplete neurology (2 points) totals 7, indicating surgery. The AO Spine classification subtypes type A compression injuries, where A0 denotes minor fractures like spinous process involvement without stability threat, A1 is wedge compression of one endplate, and A4 represents complete burst fractures with both endplates and walls disrupted, often requiring operative stabilization if neurologically compromised. These systems emphasize the thoracolumbar junction's propensity for unstable patterns at T12-L1. Neurological risks in thoracolumbar fractures are generally lower than in cervical injuries due to the spinal cord terminating at L1-L2, transitioning to the in the region, but significant deficits can occur from retropulsed fragments compressing nerve roots. In thoracic levels, incomplete cord injuries like paraparesis may result, while burst fractures at or below L1 carry a notable risk of , manifesting as bowel/bladder dysfunction, , and lower extremity weakness in up to 10-15% of severe cases. Early decompression is critical for incomplete deficits to optimize recovery.

Sacral spine fractures

Sacral spine fractures are relatively rare injuries, comprising about 1-3% of all spinal fractures, and are predominantly caused by high-energy trauma involving the . These fractures often result in significant neurological compromise due to the proximity of the sacral nerve roots, which can affect lower limb function, bowel, , and sexual control. The Denis classification system divides sacral fractures into three zones based on their anatomical location relative to the neural foramina. Zone I fractures occur in the alar region lateral to the foramina and represent the most common type, with a low risk of neurological injury (approximately 6%), typically involving the L5 nerve root. Zone II fractures pass through the foramina and carry a moderate risk of nerve injury (around 28%), potentially affecting the S1-S2 roots and leading to bowel or bladder dysfunction. Zone III fractures involve the central sacral body medial to the foramina and have the highest neurological injury rate (over 56%), with more than 76% of these cases resulting in bowel, bladder, or sexual dysfunction due to involvement of the S2-S4 nerve roots. Sacral fractures are further categorized as vertical or transverse; vertical fractures align with the Denis zones and often result from shear forces, while transverse fractures cross the sacrum horizontally, typically at the upper levels, and are associated with axial loading. These fractures are associated with pelvic ring injuries in 80% to 90% of cases and frequently involve lumbosacral dissociation, particularly in U- or H-shaped patterns that disrupt the spinopelvic junction. Common mechanisms include falls onto the buttocks, which produce transverse fractures through direct impact, and high-energy events such as crashes causing vertical shear forces that propagate through the . Neurological risks are elevated due to the sacral nerve roots' vulnerability, with injuries to S2-S4 commonly leading to urological and through disruption of parasympathetic innervation to the , , and genital organs.

Clinical presentation and diagnosis

Symptoms and physical findings

Spinal fractures typically present with acute, severe localized to the site of , often described as sharp or aching and exacerbated by any movement, , or of the affected area, such as standing or walking, which can severely limit daily activities like sitting, lifting objects, or performing routine tasks. This arises from disruption of the vertebral structure and surrounding soft tissues, and in cases involving compression, it may radiate along dermatomal patterns, manifesting as into the limbs. For instance, cervical fractures can cause radiating to the shoulders or arms, while thoracolumbar fractures often result in mid-to-lower that intensifies with axial loading. Additionally, patients often experience reduced mobility, with difficulty bending, twisting, or carrying loads. Neurological symptoms occur when the fracture compromises the or nerve roots, serving as critical red flags indicating potential or cord injury. These may include motor weakness or below the level of the fracture, sensory deficits such as numbness or in the extremities, and autonomic dysfunction like bowel or incontinence due to loss of neural control. In high thoracic or cervical injuries, patients might exhibit and areflexia during the acute phase of , a transient phenomenon characterized by temporary spinal cord dysfunction. Complete cord transection can lead to profound deficits, whereas incomplete injuries may present with varying degrees of sensory and motor preservation. Physical examination often reveals visible or palpable , particularly in unstable fractures. Compression fractures commonly cause localized kyphotic , resulting in a forward stoop or gibbus at the injury site, along with potential loss of overall spinal height. In burst or injuries, a step-off may be appreciated on of the spinous processes, indicating vertebral displacement or ligamentous disruption. Tenderness to percussion over the affected vertebrae is nearly universal, and patients may guard against motion, limiting in flexion, extension, or rotation. Systemic manifestations are prominent in high-energy traumatic fractures, where patients may present in neurogenic or , evidenced by , , and altered mental status due to sympathetic disruption or associated injuries. Fever is absent in purely traumatic cases but may occur in pathological fractures secondary to underlying or . Individuals with preexisting risk factors, such as , are more prone to severe pain and functional impairment from even minor trauma.

Imaging and diagnostic tests

Diagnosis of spinal fractures requires a combination of imaging modalities to confirm the presence, characterize the extent, and assess associated injuries, often prompted by acute or neurological symptoms following trauma. These tests help differentiate traumatic from pathological fractures and guide management. Plain radiography, or , serves as the initial screening tool for suspected spinal fractures due to its accessibility and low cost. Anteroposterior and lateral views evaluate vertebral alignment, height loss, and wedge angles, using methods like Genant’s semi-quantitative grading (Grade 1 for 20-25% height reduction, up to Grade 3 for >40%). Flexion-extension views detect by revealing abnormal motion between vertebrae. However, X-rays miss up to 50% of fractures and struggle to distinguish acute from chronic lesions without prior comparisons. Computed tomography (CT) is the gold standard for detailed bony assessment in spinal fractures, particularly in trauma settings, with multidetector CT offering 97-100% sensitivity for detecting fractures missed on . It excels in visualizing cortical disruptions, posterior element involvement, and canal compromise, while sagittal and 3D reconstructions aid in surgical planning. Limitations include higher and inability to evaluate soft tissues or ligaments. Magnetic resonance imaging (MRI) is essential for evaluating soft tissue and neurological involvement, such as ligament integrity, spinal cord edema, and nerve root compression. It differentiates benign from malignant fractures by detecting bone marrow edema (indicating acuity) and features like restricted diffusion in tumors, with high sensitivity (93%) for disc and ligament injuries. MRI is particularly valuable when neurological deficits are present but is limited by cost, availability, and contraindications like pacemakers. Laboratory tests are crucial for identifying pathological causes of spinal fractures, such as or metabolic disorders. Basic evaluations include serum calcium, phosphate, , , 25-hydroxyvitamin D, and (PTH) levels to detect conditions like , where elevated PTH and calcium contribute to fragility fractures. Additional targeted tests, such as for , are indicated based on clinical suspicion. Dual-energy X-ray absorptiometry (DEXA) assesses bone mineral density to evaluate underlying , a common predisposing factor for spinal s, using T-scores (e.g., <-2.5 indicating ). Vertebral assessment via DEXA detects moderate to severe deformities with lower than standard X-rays but has reduced sensitivity for mild or upper thoracic .

Management and treatment

Conservative approaches

Conservative approaches are indicated for stable spinal fractures without neurological deficits, such as those classified with a Thoracolumbar Injury Classification and Severity (TLICS) score less than 4. These include compression fractures and certain burst fractures where the posterior ligamentous complex remains intact, allowing non-operative healing to promote stability and function restoration. Bracing is a cornerstone of conservative management to immobilize the spine, reduce , and facilitate . For thoracolumbar fractures, a thoracolumbosacral orthosis (TLSO) is commonly used to limit flexion and support the torso, while lower injuries may employ a lumbosacral orthosis. In cervical spine fractures, a rigid provides initial stabilization, with more severe cases potentially requiring a halo vest for superior immobilization. Bracing duration typically ranges from 6 to 12 weeks, guided by serial imaging to confirm radiographic and resolution before discontinuation. Pain management focuses on multimodal strategies to control acute symptoms while minimizing side effects. Nonsteroidal anti-inflammatory drugs (NSAIDs) are first-line for inflammation and mild to moderate pain, with short-term opioids reserved for severe cases due to risks of dependence and gastrointestinal issues. In osteoporotic fractures, bisphosphonates are incorporated to alleviate pain and reduce the risk of subsequent vertebral fractures by approximately 48%. Calcitonin may be used for fractures less than 10 days old to provide targeted analgesia. Rehabilitation emphasizes early mobilization to prevent , with initiating within 48 hours to promote strengthening of paraspinal muscles and improve posture. Prolonged beyond 48 hours is avoided to reduce risks of and , favoring a progressive program that includes training and core stabilization exercises tailored to the fracture location. This approach aims to restore functional mobility, with outcomes monitored through clinical follow-up and imaging at 4- to 6-week intervals.

Surgical interventions

Surgical interventions are indicated for spinal fractures that are unstable, involve significant , or result in neurological , aiming to decompress neural elements and restore spinal stability. Decompression procedures, such as , are performed to remove bone fragments or retropulsed material from the , thereby alleviating pressure on the or . This approach is particularly relevant in burst fractures where retropulsed fragments threaten neural integrity, with studies showing improved neurological outcomes when combined with stabilization. Stabilization techniques commonly involve posterior spinal fusion using pedicle screw instrumentation, which provides immediate rigidity to the affected segment by anchoring screws into the vertebral pedicles and connecting them with rods. This method is effective for thoracolumbar fractures, reducing kyphotic and preventing further displacement, with high fusion rates reported in clinical series. For anterior column involvement, corpectomy may be employed, entailing the removal of the damaged vertebral body followed by reconstruction with a graft or cage and anterior plating to restore height and alignment. Anterior approaches are favored in cases of severe vertebral body , offering direct access for decompression and load-bearing reconstruction. In osteoporotic patients, minimally invasive options like percutaneous vertebroplasty or kyphoplasty are preferred for compression fractures, involving the injection of to stabilize the and alleviate without extensive . Kyphoplasty additionally uses a to restore vertebral height prior to cement augmentation, demonstrating reduced and improved mobility compared to conservative management in select cases. Surgical timing is critical, with emergent decompression recommended within 24 hours for patients with incomplete neurological deficits to maximize recovery potential and minimize secondary . Recent advances as of 2025 include robotic-assisted systems for precise pedicle placement, which enhance accuracy, reduce , and shorten operative times in fracture stabilization. These technologies, such as the Mazor X platform, have shown superior positioning rates over 95% in thoracolumbar fractures.

Complications and prognosis

Acute complications

Acute complications of spinal fractures encompass immediate risks that can develop post-injury or during early management, potentially leading to life-threatening conditions if not promptly addressed. These include neurological deterioration, vascular injuries, infections, and thromboembolic events, each influenced by the fracture's location, severity, and associated involvement. Additionally, acute back pain that worsens with movement, standing, or walking can severely limit daily activities, while reduced mobility may manifest as difficulty bending, twisting, or carrying loads. Neurological worsening often stems from secondary mechanisms such as and progression. emerges rapidly after trauma, typically within hours, and can endure for several days, compressing neural tissue and impairing blood flow, which exacerbates ischemia and neurologic deficits. Similarly, progression of a spinal —whether epidural or intradural—can cause acute cord compression, leading to rapid deterioration in motor and sensory function; small hematomas may be , but larger ones necessitate urgent decompression to prevent permanent damage. All forms of spinal trauma contribute to this by disrupting vascular integrity, further reducing oxygenation and amplifying initial effects. In severe trauma cases, rare neurological problems such as leg weakness, paralysis, or sensory loss may occur, though typical compression fractures spare the spinal cord. Vascular complications pose particular risks depending on fracture type and location. In cervical spine fractures, occurs due to the artery's intimate association with the transverse foramina of the vertebrae, with injury rates up to 20-30% in high-risk transverse process or facet fractures, potentially resulting in cerebral ischemia or . For thoracolumbar burst fractures, represents a rare but severe acute event, where marrow fat enters the circulation, leading to respiratory distress, petechiae, and altered mental status; this has been documented as a fatal outcome even in vertebral compression fractures without surgical intervention. These vascular insults can compound the primary trauma, underscoring the need for vigilant vascular imaging in at-risk patients. Infections arise as acute threats, particularly in the context of immobilization or surgical management. Surgical site infections following for spinal fractures occur in approximately 7.5% of cases in trauma settings, driven by factors such as prolonged operative duration, blood loss, and posterior approaches, which can delay recovery and necessitate implant removal. Immobility from acute fractures also predisposes patients to , with incidence rates of 11-84% reported in those with associated , attributed to reduced cough effectiveness, , and impaired . These infectious risks highlight the importance of early and prophylactic measures in hospitalized individuals. Thromboembolic complications, including deep vein thrombosis (DVT) and (PE), are prevalent among immobilized patients with spinal fractures. The incidence of DVT in this population ranges from 2-7%, elevated by , endothelial injury, and , with PE occurring in a subset and carrying high mortality if undetected. Prolonged and involvement further amplify this risk, making routine prophylaxis essential during acute hospitalization.

Long-term outcomes

Long-term outcomes following spinal fractures vary significantly based on fracture stability, age, presence of neurological , and treatment approach. In cases without neurological deficits, approximately 70-80% of s achieve sufficient functional recovery to return to full-time work or pre- activity levels, often within one to two years post-. However, outcomes are poorer in elderly s or those with neurological involvement, where recovery rates drop due to comorbidities, reduced bone quality, and slower rehabilitation progress; for instance, elderly individuals with traumatic experience higher rates of persistent and dependency in . Chronic pain and spinal deformity represent common long-term sequelae, particularly in vertebral compression fractures. Kyphotic deformity can progress over time, leading to altered biomechanics, reduced pulmonary function, and ongoing back pain that affects quality of life; this may also cause loss of height and a stooped posture known as "dowager's hump." If thoracic vertebrae are affected, breathing problems may arise due to restricted lung expansion, while abdominal pressure from the deformity can lead to digestive issues, reduced appetite, or weight loss. One vertebral fracture increases the risk of additional fractures fivefold, emphasizing the need to treat underlying causes such as osteoporosis with medications like bisphosphonates, lifestyle modifications, and preventive measures to reduce further bone loss. Post-surgical fusion further increases the risk of adjacent segment disease, where degeneration occurs in neighboring vertebrae due to increased mechanical stress, manifesting as chronic radiculopathy or myelopathy in up to 20-30% of cases within five to ten years. One-year mortality rates for osteoporotic spinal fractures range from 20-30%, comparable to fractures, primarily driven by complications such as , cardiovascular events, and pulmonary issues rather than the fracture itself. Recent 2025 analyses highlight improved long-term functional outcomes with early rehabilitation protocols, including prompt and multidisciplinary , which enhance relief, mobility restoration, and reduction in compared to delayed interventions; as of mid-2025, updates emphasize integrating these protocols for osteoporotic cases to better support elderly recovery.

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