In a 68-year-old man with known degenerative disc disease whose last MRI was five years ago and who has no new concerning findings, should I repeat the MRI and forward it to orthopedics?

Do Not Repeat the MRI

In a 68-year-old man with known degenerative disc disease whose last MRI was 5 years ago and who has no new concerning findings, you should NOT repeat the MRI before referring to orthopedics. The evidence clearly demonstrates that repeat imaging in patients with degenerative disc disease rarely changes management and that clinical assessment should drive decision-making, not routine reimaging.

Key Evidence Against Routine Repeat Imaging

The 2021 ACR Appropriateness Criteria explicitly states that repeat imaging in patients with new episodes of low back pain and previous MRI scans are unlikely to detect differences in disc protrusion, annular fissures, high-intensity zones, or end-plate signal changes 1. This is critical because degenerative changes progress slowly and predictably with age—even in asymptomatic patients, disc protrusion prevalence increases from 29% at age 20 to 43% at age 80 1.

Recent research strongly supports this guideline-based approach:

• A 2024 study of 481 patients who underwent repeat MRI within 12 months found that 81% showed no radiological change, and only 0.62% required urgent intervention 2
• A 2019 analysis of 28,676 surgical cases found that timing of preoperative MRI was not associated with revision surgery rates, suggesting that older imaging remains clinically valid 3
• A 2023 Norwegian study of patients with repeat MRI within one year before surgery concluded that repeat MRI showed few significant changes and provided limited benefit to surgeons 4

When Imaging IS Indicated

You should only obtain new imaging if there are:

• Red flag symptoms: New or progressive neurologic deficits (weakness, numbness, bowel/bladder dysfunction suggesting cauda equina syndrome)
• Suspected serious pathology: Fever, unexplained weight loss, history of cancer, or severe night pain suggesting infection or malignancy
• Failed conservative management: 6+ weeks of appropriate medical management and physical therapy with persistent symptoms severe enough to consider surgical intervention 1, 5
• New clinical findings on examination: Documented change in neurologic status, new radiculopathy pattern, or progressive motor weakness

Clinical Decision Algorithm

For your 68-year-old patient with known degenerative disc disease:

1. Perform focused clinical assessment: Document current pain level, functional limitations, neurologic examination (strength, sensation, reflexes, straight leg raise)

2. If examination is stable/unchanged: Refer to orthopedics with the existing 5-year-old MRI and current clinical findings. The orthopedic surgeon can determine if updated imaging is needed based on surgical candidacy

3. If new red flags present: Obtain urgent MRI before referral (preferred over CT for better soft tissue visualization) 5

4. If considering surgery: The orthopedic surgeon will determine if updated imaging is necessary based on correlation between current symptoms and old radiographic findings

Important Caveats

Avoid the common pitfall of reflexive reimaging. The ACR guidelines note that non-adherence to imaging recommendations leads to increased healthcare utilization, higher rates of unnecessary injections and surgeries, and increased disability compensation—without improving patient outcomes 1. A prospective study showed that patients who received early MRI (within 6 weeks) had significantly higher rates of interventions but no better clinical outcomes 1.

Age-related degenerative changes are expected and often asymptomatic. In your 68-year-old patient, new degenerative findings on repeat MRI would be anticipated but may not correlate with symptoms. The Carragee study found that 84% of patients with pre-existing lumbar imaging abnormalities had unchanged or improved findings after symptoms developed 1.

Bottom Line for Orthopedic Referral

Send the patient to orthopedics with:

• The 5-year-old MRI report and images (if accessible)
• Detailed current clinical examination findings
• Documentation of conservative treatments attempted and their response
• Clear description of current functional limitations

Let the orthopedic surgeon decide if updated imaging is needed based on whether the patient is a surgical candidate and whether the old imaging adequately correlates with current symptoms. This approach avoids unnecessary radiation exposure (if CT is used), patient anxiety from additional testing, healthcare costs, and potential delays in appropriate management 2, 3, 4.