Clinical context A 68-year-old postmenopausal woman with several established risk factors for osteoporosis presents with acute thoracic back pain after a low-energy activity. The key task is to distinguish a fragility fracture from mechanical or neurogenic causes of back pain.
Why this is a vertebral compression fracture The patient’s profile combines multiple independent risk factors for osteoporotic fragility fracture: postmenopausal status, low body weight of
45 kg, current smoking, and
1 year of oral glucocorticoid therapy. Glucocorticoid use is particularly important because it reduces bone formation and accelerates bone loss even when serum calcium remains within the normal range, as seen here with a calcium of
9.1 mg/dL (normal
8.6–10.2 mg/dL).
The pain characteristics strongly suggest a vertebral compression fracture.
Sudden back pain triggered by lifting a pail of water, worsening with standing and easing when lying down, reflects mechanical loading of a compromised vertebral body. In the supine position, axial load on the anterior column decreases, which reduces pain from the fractured vertebra. Point tenderness directly over a single thoracic spinous process localizes the lesion to the vertebral body rather than to paraspinal muscles or a disc.
Height loss of
4.5 cm from peak young-adult height is a critical finding.
Loss of more than 4 cm from peak height is a clinical marker of prevalent vertebral fracture and reflects cumulative anterior wedging of thoracic vertebrae. This degree of height loss is not explained by disc degeneration alone and points toward structural collapse of one or more vertebral bodies.
Watch out! The absence of radiating leg pain, normal lower-extremity strength, and intact sensation argue against disc herniation or spinal stenosis with nerve root compression. Those conditions typically produce radicular symptoms or neurogenic claudication, which are absent here.
Key point! A fragility fracture can occur with minimal or no remembered trauma. More than two-thirds of vertebral compression fractures are detected incidentally, and many patients cannot recall a specific injury. A low-energy event such as lifting, coughing, or bending is often sufficient to fracture an osteoporotic vertebra.
| Feature | Vertebral compression fracture | Disc herniation | Spinal stenosis | Paraspinal muscle strain |
|---|
| Onset | Sudden, after minor load (lifting, cough) | Sudden or gradual, often after flexion/twist | Gradual, posture-dependent | After unaccustomed activity |
| Pain location | Midline thoracic, point tenderness over spinous process | Often lumbar, may radiate to leg | Lumbar, buttock, leg with walking | Diffuse paravertebral, no point tenderness |
| Neurologic deficit | Typically absent | Common (dermatomal sensory/motor) | Common (radicular or claudication) | Absent |
| Height loss | Progressive, may exceed 4 cm | Not typical | Not typical | Not typical |
| Pain with standing | Worse | Variable | Worse with extension/walking | Worse with movement |
| Pain lying down | Eased | Variable | Often eased with flexion | Eased |
Pathophysiology link Osteoporotic bone has reduced trabecular connectivity and thinner cortices, especially in the anterior portion of the vertebral body. When axial load is applied, the weakened anterior column fails first, producing an anterior wedge deformity. This explains the progressive height loss and the thoracic kyphosis that often accompanies multiple compression fractures. Glucocorticoids compound this by inhibiting osteoblast function and promoting osteocyte apoptosis, which is why even a normal serum calcium does not rule out significant bone fragility.
Diagnostic confirmation Plain radiographs are the initial imaging modality to confirm a vertebral compression fracture and assess for wedge deformity or loss of vertebral height. Computed tomography or magnetic resonance imaging may be needed if neurologic deficits are present or if a malignant cause is suspected. MRI is the preferred modality to determine fracture acuity and to evaluate for marrow edema when the timing of the fracture is unclear.
Nursing and licensure exam relevance For the PNLE or NCLEX-RN, recognize that a postmenopausal woman with low body weight, smoking history, and glucocorticoid use who develops acute midline back pain after minimal trauma should be presumed to have a vertebral compression fracture until imaging proves otherwise. Height loss greater than
4 cm from peak height is a red flag for prevalent vertebral fracture. Neurologic findings are usually absent, and their presence should prompt evaluation for cord or nerve root compression.