In a patient with multiple thoracic compression fractures of unknown age and persistent thoracic pain, should I obtain MRI rather than CT to assess fracture chronicity, and should a DEXA scan be performed before considering vertebral kyphoplasty or vertebroplasty?

MRI Over CT for Fracture Chronicity Assessment

You should obtain an MRI thoracic spine without IV contrast to assess fracture chronicity, and yes, obtain a DEXA scan before considering vertebroplasty or kyphoplasty. 1

Imaging Strategy for Fracture Chronicity

MRI is the modality of choice for determining fracture acuity because it identifies bone marrow edema, which distinguishes acute from chronic compression fractures 1, 2. The 2024 ACR Appropriateness Criteria explicitly state that "thoracic vertebral body fractures seen on radiographs may be difficult to estimate in terms of chronicity without priors to compare to. In those cases, MRI or bone scan may be needed to age the fracture acuity" 1.

Why MRI, Not CT:

• CT cannot determine fracture chronicity - it only shows osseous detail and anatomy but provides no information about bone marrow edema or fracture age 1, 3
• MRI without IV contrast is sufficient for identifying marrow edema patterns that indicate acute fractures 1
• CT adds unnecessary radiation exposure and cost without contributing to chronicity assessment 3

A 2019 study analyzing 259 compression fracture workups found that 29.3% of patients underwent extraneous CT scans that provided no additional diagnostic value for determining acuity, resulting in an average of 979.4 mGy cm of unnecessary radiation exposure 3.

Alternative if MRI Contraindicated:

If MRI cannot be obtained (pacemaker, severe claustrophobia, metallic implants), bone scan with SPECT or SPECT/CT is an appropriate alternative for assessing fracture acuity 1.

DEXA Scan Before Vertebral Augmentation

Yes, obtain a DEXA scan as part of the pre-procedure evaluation. While not explicitly required by vertebroplasty/kyphoplasty guidelines, DEXA scanning serves multiple critical purposes:

Rationale for DEXA:

1. Identifies underlying osteoporosis that caused the fracture, which affects long-term management 4, 5
2. Guides post-procedure osteoporosis treatment to prevent future fractures 5, 6
3. Assesses fracture risk at adjacent levels - patients with severe osteoporosis have higher risk of subsequent vertebral fractures after augmentation 6, 7
4. Informs treatment intensity - severe osteoporosis may warrant more aggressive medical management 5

The 2017 EULAR/EFORT guidelines emphasize that "evaluation of the risk of subsequent fractures includes a review of clinical risk factors, DXA of spine and hip, imaging of the spine for vertebral fractures" 5.

Pre-Vertebroplasty/Kyphoplasty Workup Algorithm

Step 1: Confirm Fracture Acuity with MRI

• MRI thoracic spine without IV contrast to identify bone marrow edema
• Positive finding: High T2/STIR signal in vertebral body indicating acute fracture
• This determines candidacy for vertebral augmentation 4, 2

Step 2: Obtain DEXA Scan

• Measure BMD at lumbar spine and hip
• Identifies severity of osteoporosis
• Guides post-procedure medical management 5

Step 3: Additional Pre-Procedure Requirements per SNIS Guidelines 4:

• Point tenderness at spinous process of fractured vertebra on physical exam
• Baseline neurological examination documented
• Laboratory evaluation: Consider calcium, albumin, creatinine, TSH to exclude secondary causes
• Confirm pain duration: Minimum 6 weeks of conservative management failure (though earlier intervention may be appropriate for severe pain)

Step 4: Rule Out Contraindications 4:

• Absolute: Active infection, uncorrectable coagulopathy, allergy to cement
• Relative: Significant canal stenosis, radiculopathy exceeding local pain

Critical Pitfalls to Avoid

Do not rely on CT alone - A 2019 study demonstrated that 40.2% of appropriate workups used only MRI or bone scan after radiographs, avoiding unnecessary CT 3. CT should be reserved for pre-surgical planning if needed, not for chronicity assessment.

Do not assume all fractures without bone marrow edema are chronic - A rare 2026 case report documented acute vertebral compression fractures in a multiple myeloma patient lacking BME on MRI 8. In patients with malignancy or atypical presentations, correlate imaging with clinical timeline and consider comparison with prior studies.

Do not proceed with augmentation without confirming acuity - The 2014 SNIS guidelines emphasize that "if there is a clear disparity between the physical examination findings and imaging or a clear alternative source of back pain, vertebral augmentation should not be performed" 4.

Timeline Considerations

MRI should be obtained promptly - The 2024 ACR guidelines note that 95% of patients in their cohort underwent MRI within 7 days of initial radiographic assessment 9. Fracture risk is highest immediately after the initial fracture and decreases over time 5, making timely diagnosis and intervention important for preventing subsequent fractures.