Vertebral Compression Fracture

Overview

A vertebral compression fracture is a structural failure of the vertebral body in which the front or central portion collapses under axial load, producing a loss of height most often in a wedge, biconcave, or crush shape. The vertebral body is built predominantly of trabecular (spongy) bone inside a thin outer shell, an architecture well suited to bearing compressive force. When bone strength is reduced or the applied force exceeds what the bone can tolerate, the front column buckles. Because the middle and rear columns typically remain intact, this distinguishes the classic compression fracture from a burst fracture, in which middle-column involvement can push bone fragment toward the spinal canal.

Most compression fractures occur at the thoracolumbar junction (roughly T11 to L2), a biomechanical transition zone between the relatively rigid thoracic spine and the more mobile lumbar spine where mechanical stress concentrates.

What causes it

Osteoporosis is by far the leading cause, making postmenopausal women and older men the predominant affected groups, with incidence rising steeply with age. When bone mineral density is significantly reduced, the inciting event can be entirely trivial (bending forward, lifting a light object, coughing, or a minor fall), and many fractures occur without any recalled trauma. Major risk factors include low bone density, a prior fragility fracture, chronic corticosteroid use, low body weight, smoking, excess alcohol intake, and any condition or medication that accelerates bone loss.

In younger patients, a compression fracture usually implies a high-energy mechanism such as a fall from height or motor vehicle accident, rather than underlying bone disease.

A fracture occurring with little or no trauma in someone with a known or suspected malignancy, or one with unusual features on imaging, should raise concern for a pathologic fracture from metastatic disease, multiple myeloma, or, less commonly, spinal infection. These require a different evaluation and treatment pathway from a routine fragility fracture.

Symptoms and warning signs

An acute fracture classically presents with sudden, focal back pain that worsens with standing, axial loading, and movement, and eases with lying down. There is typically localized tenderness to percussion directly over the affected vertebra. Many osteoporotic fractures, however, are clinically silent and found incidentally on imaging obtained for another reason.

Over time, multiple fractures can lead to cumulative loss of height and a progressive thoracic kyphotic deformity, the stooped posture often seen in older patients with significant osteoporosis.

Certain features demand prompt evaluation rather than routine management. Neurological deficit, saddle anesthesia, or bowel or bladder dysfunction can indicate cord or cauda equina involvement and require urgent assessment. Fever, night sweats, or a presentation suggesting infection point toward vertebral osteomyelitis rather than a fragility fracture. Constitutional symptoms, a history of cancer, or relentless pain that does not ease with rest or at night should raise concern for malignancy. A high-energy mechanism, or posterior tenderness with any sign that the fracture extends into the middle or rear columns, warrants immediate evaluation to exclude an unstable injury.

How it's diagnosed

Diagnosis begins with plain radiographs, which show loss of vertebral body height and the characteristic wedge or endplate deformity, and allow comparison across multiple levels to gauge acuity. Computed tomography provides finer detail of fracture morphology, cortical integrity, and posterior element involvement, and is valuable when instability or a burst component is suspected.

Magnetic resonance imaging is the most useful study for distinguishing an acute or subacute fracture from a chronic healed one: marrow edema on fluid-sensitive sequences indicates a recent or unhealed fracture. MRI is essential when malignancy or infection is suspected or when there is any neurological compromise, as it best evaluates the bone marrow, surrounding soft tissues, epidural space, and neural elements.

Because degenerative and old healed fractures are common incidental findings, imaging must always be correlated carefully with the clinical picture and the location of pain. In patients without a clear traumatic explanation, evaluation of bone health with dual-energy X-ray absorptiometry (DEXA) and laboratory testing for secondary causes of bone loss is warranted. Atypical presentations may require additional workup for myeloma or metastatic disease.

Treatment options

Management of a stable osteoporotic compression fracture is primarily non-operative. This includes short-term analgesia for acute pain, early mobilization to prevent deconditioning, activity modification, and consideration of a brace for symptomatic support during the healing period.

Equally important, and often underemphasized, is treating the underlying osteoporosis. Adequate calcium and vitamin D intake, combined with pharmacologic therapy such as bisphosphonates or anabolic agents, substantially reduces the risk of subsequent fragility fractures.

For patients with severe, persistent pain that fails an adequate trial of conservative care, vertebral augmentation procedures may be considered. Balloon kyphoplasty can provide pain relief and offers the potential for partial restoration of vertebral height. Vertebroplasty is an alternative augmentation approach. Both procedures require careful patient selection and are not appropriate for all fracture types.

When surgery is considered

Open surgical intervention is reserved for specific circumstances: a neurological deficit caused by canal compromise; demonstrable spinal instability; significant or progressive deformity that cannot be managed conservatively; or fractures associated with tumor or infection that require decompression and structural stabilization. When malignancy, infection, or an unstable traumatic injury is identified, management shifts to urgent, condition-specific treatment rather than routine fracture care. In these situations, the goals, timing, and approach of surgery are determined by the underlying diagnosis rather than by the fracture pattern alone.