Last reviewed: March 2026
Contents
MDM Templates
Benign / MSK / Disc Herniation
Patient presents with low back pain without red-flag features. They deny saddle anesthesia, bowel or bladder dysfunction, progressive lower extremity weakness, and fever. They are well appearing with a normal neurological exam including intact strength, sensation, and rectal tone.
History and exam lower suspicion for cauda equina syndrome, spinal cord compression, vertebral fracture, spinal epidural abscess, vertebral osteomyelitis, and malignancy. Presentation most consistent with musculoskeletal back pain.
Plan: Analgesics and muscle relaxant. Imaging deferred — not indicated in the absence of red-flag features.
Disposition: Discharge with return precautions for new weakness, numbness, or bowel/bladder changes. Follow up with PCP within 1 week.
Sciatica
Patient presents with low back pain radiating to the lower extremity in a dermatomal distribution consistent with radiculopathy. They deny saddle anesthesia, bowel or bladder dysfunction, and bilateral symptoms. Neurological exam demonstrates intact strength and sensation without upper motor neuron signs.
History and exam lower suspicion for cauda equina syndrome, spinal cord compression, spinal epidural abscess, and malignancy. Presentation most consistent with lumbar radiculopathy from disc herniation.
Plan: Analgesics. Oral corticosteroid taper considered for symptom relief. Imaging deferred for outpatient follow-up — MRI is the study of choice if symptoms persist beyond 6 weeks or worsen.
Disposition: Discharge with return precautions for new weakness, saddle anesthesia, or bowel/bladder changes. Follow up with PCP within 1–2 weeks.
Cauda Equina / Cord Compression
Patient presents with back pain and neurological deficits concerning for cauda equina syndrome — including saddle anesthesia, bowel or bladder dysfunction, and/or bilateral lower extremity weakness. This is a time-sensitive surgical emergency.
Given history and exam, concern is high for cauda equina syndrome from disc herniation, epidural abscess, or epidural hematoma. Emergent MRI obtained.
Neurosurgery consulted: Regarding patient’s neurological deficits, imaging findings, and need for emergent surgical decompression.
Plan: Foley catheter for bladder decompression. Analgesia.
Disposition: Admit for emergent surgical intervention. Speed of decompression directly correlates with neurological outcome.
Clinical Education
Red Flags
These features should prompt further workup — imaging, labs, or both. The mnemonic is less important than the clinical gestalt, but the major categories are: saddle anesthesia or bowel/bladder dysfunction (cauda equina), fever or IVDU (epidural abscess), cancer history or unexplained weight loss (malignancy), significant trauma or osteoporosis (fracture), and progressive motor deficit (cord compression).[1]
| Red Flag | Concern |
| Saddle anesthesia, urinary retention, fecal incontinence | Cauda equina syndrome |
| Fever, IVDU, recent spinal procedure | Epidural abscess / osteomyelitis |
| History of cancer, unexplained weight loss, age >50 with new pain | Malignancy / metastatic disease |
| Significant trauma, osteoporosis, chronic steroid use | Vertebral fracture |
| Progressive bilateral weakness, upper motor neuron signs | Cord compression |
Cauda Equina Pearls
Post-void residual >100–200 mL is the most sensitive early finding. Bladder dysfunction often precedes saddle anesthesia and bilateral weakness. If a patient with LBP reports any urinary symptoms — hesitancy, retention, incontinence — check a PVR by ultrasound or catheterization. A PVR >100 mL should trigger emergent MRI.[2]
Speed of surgical decompression directly correlates with outcome. More than 85% of patients with cauda equina develop symptoms over just hours. Delay beyond 48 hours from symptom onset significantly worsens outcomes for bladder function, sexual function, and motor recovery. This is one of the few true surgical emergencies in spine — treat the MRI like you would a cath lab activation.[3]
Steroids are not proven to help. There is no significant primary evidence supporting steroid use in cauda equina syndrome. Defer to the neurosurgeon’s preference — the treatment is decompression, not medical management.[2]
When to Image
Most patients with LBP do not need imaging in the ED. Plain films are indicated when you need to rule out fracture, malignancy, or infection — specifically in patients with trauma, fever, cancer history, immunosuppression, prolonged steroid use, osteoporosis, or age >70. The purpose of LS radiographs is to exclude fracture or bony pathology, not to diagnose disc disease.[1]
MRI is the study of choice for suspected cauda equina, epidural abscess, or malignancy. Don’t get a CT as a substitute when MRI is what you need — CT misses soft tissue pathology. If MRI isn’t available, this patient may need transfer. For radiculopathy without red flags, MRI is an outpatient study — most disc herniations resolve within 6–12 weeks.[4]
ED Treatment
NSAIDs are first-line and outperform opioids for acute mechanical LBP. Ibuprofen 600 mg or naproxen 500 mg. Add a muscle relaxant (cyclobenzaprine 10 mg TID or methocarbamol 750 mg QID) for patients with significant spasm — there’s modest evidence these help in the first 1–2 weeks.[5]
Oral steroids for radiculopathy are a reasonable option. A short course of prednisone (60 mg daily for 5 days or a Medrol dose pack) may improve pain and function in acute radiculopathy, though the evidence is mixed. The NNT is roughly 5–7 for meaningful short-term pain relief. Not indicated for mechanical LBP without radicular symptoms.[6]
Avoid benzodiazepines. They are not superior to muscle relaxants for LBP and carry significantly more risk. Avoid opioids if possible — they are not first-line and provide marginal benefit over NSAIDs for acute LBP.[5]
Spinal Epidural Abscess
The classic triad of fever, back pain, and neurological deficit is present in only ~10–15% of cases at diagnosis. Most patients present with just back pain and fever — the neuro deficits come later, and by then outcomes are worse. Have a low threshold for MRI in IVDU patients, diabetics, immunocompromised patients, or anyone with recent spinal procedure and fever.[7]
Labs help but don’t rule it out. ESR >20 and CRP elevation are sensitive (~90%) but not specific. A normal ESR makes epidural abscess very unlikely. Blood cultures are positive in ~60% of cases. The organism is Staph aureus in >60%.[7]
Disposition
Discharge instructions matter more than the ED visit for most LBP patients. The key return precautions are new or worsening weakness, saddle anesthesia, and bowel or bladder dysfunction. Approximately 2.5–6% of patients with disc herniations ultimately develop cauda equina syndrome — making discharge instructions for this population genuinely important.[2]
Admit for: cauda equina syndrome (emergent surgery), epidural abscess (antibiotics + likely surgery), unstable vertebral fracture, or inability to ambulate safely.
References
- Casazza BA. Diagnosis and treatment of acute low back pain. Am Fam Physician. 2012;85(4):343-350. PubMed
- Long B, Koyfman A, Gottlieb M. Evaluation and management of cauda equina syndrome in the emergency department. Am J Emerg Med. 2020;38(1):143-148. PubMed
- Ahn UM et al. Cauda equina syndrome secondary to lumbar disc herniation: a meta-analysis of surgical outcomes. Spine. 2000;25(12):1515-1522. PubMed
- Chou R et al. Diagnostic imaging for low back pain: advice for high-value health care from the ACP. Ann Intern Med. 2011;154(3):181-189. PubMed
- Friedman BW et al. Naproxen with cyclobenzaprine, oxycodone/acetaminophen, or placebo for treating acute low back pain: a randomized clinical trial. JAMA. 2015;314(15):1572-1580. PubMed
- Goldberg H et al. Oral steroids for acute radiculopathy due to a herniated lumbar disk: a randomized clinical trial. JAMA. 2015;313(19):1915-1923. PubMed
- Davis DP et al. The clinical presentation and impact of diagnostic delays on emergency department patients with spinal epidural abscess. J Emerg Med. 2004;26(3):285-291. PubMed
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