A 52-year-old man with chronic low back pain due to lumbar spondylosis presents to the pain clinic. He has been on oral paracetamol 1 g thrice daily and ibuprofen 400 mg twice daily for 6 months without adequate relief. Physical examination reveals tenderness over L4–L5 with restricted lumbar flexion. He denies radiculopathy or neurological deficit. What is the most appropriate next step in management?

Explanation

## Management of Chronic Low Back Pain — Stepwise Approach **Key Point:** The WHO analgesic ladder and multimodal analgesia principles guide chronic pain management. When simple analgesics and NSAIDs fail over an adequate trial (≥6 weeks), the next step is interventional pain management (epidural steroid injection) rather than escalating oral medications. ### Rationale for Epidural Steroid Injection **High-Yield:** Lumbar epidural steroid injection is indicated when: - Mechanical low back pain with facet or discogenic component persists despite 6+ weeks of conservative therapy - No radiculopathy or neurological deficit (as in this case) - Imaging (MRI or CT) confirms structural pathology (spondylosis, disc bulge) - Patient is a candidate for intervention This approach avoids premature escalation to opioids and provides targeted anti-inflammatory relief. ### Why This Step Precedes Opioids **Clinical Pearl:** Tramadol and other weak opioids carry risks of dependence, tolerance, and adverse effects (constipation, dizziness, falls in older adults). They are reserved for: - Failed interventional procedures - Malignancy-related pain - Palliative care - After non-opioid and interventional options are exhausted **Warning:** Starting opioids prematurely in chronic non-cancer pain is associated with worse long-term outcomes and is discouraged by international guidelines (WHO, ASIPP). ### Imaging Requirement Epidural injection should be performed under fluoroscopic or ultrasound guidance after imaging confirms the anatomical target (L4–L5 pathology in this case). ### Why Gabapentin Is Not First-Line Here Gabapentin is indicated for neuropathic pain (radiculopathy, post-herpetic neuralgia). This patient has mechanical low back pain without radiculopathy, making gabapentin inappropriate as a primary escalation. ## Management Algorithm ```mermaid flowchart TD A[Chronic low back pain]:::outcome --> B{Adequate trial of NSAIDs<br/>+ simple analgesics?}:::decision B -->|No, <6 weeks| C[Continue conservative therapy<br/>+ physiotherapy]:::action B -->|Yes, ≥6 weeks| D{Radiculopathy or<br/>neurological deficit?}:::decision D -->|Yes| E[MRI + consider nerve root block<br/>or epidural steroid injection]:::action D -->|No| F[Imaging confirms<br/>mechanical pathology?]:::decision F -->|Yes| G[Epidural steroid injection<br/>under guidance]:::action F -->|No| H[Consider psychological<br/>assessment + pain rehab]:::action G --> I{Relief achieved?}:::decision I -->|Yes| J[Maintain with physiotherapy<br/>+ lifestyle modification]:::outcome I -->|No| K[Repeat injection or<br/>consider opioids + specialist review]:::action ``` [cite:Harrison 21e Ch 385; ASIPP Guidelines on Epidural Steroid Injections]