A 25-year-old male presents to the emergency department following a motorbike accident. He has sustained a closed midshaft tibial fracture. Six hours later, he complains of severe pain disproportionate to the injury, which worsens with passive dorsiflexion. The pain is not relieved by analgesics. Distal pulses are palpable, but there is loss of sensation in the first web space. What is the most appropriate next step in management?

Explanation

## Correct Answer: B. Immediate fasciotomy This case presents the classic triad of **compartment syndrome**: severe pain disproportionate to the injury, pain with passive stretch (dorsiflexion), and neurological deficit (loss of sensation in first web space—deep peroneal nerve distribution). The 6-hour timeline is critical: compartment syndrome is a surgical emergency that develops within hours of trauma. The intact distal pulses are a key discriminator—compartment syndrome is a *pressure* problem within a fascial compartment, not a vascular occlusion problem. Elevated intracompartmental pressure compromises microvascular perfusion and nerve function long before major arteries are affected. The loss of sensation in the first web space indicates deep peroneal nerve compression in the anterior compartment. Immediate fasciotomy is the only intervention that relieves intracompartmental pressure and prevents irreversible muscle necrosis, rhabdomyolysis, and permanent disability. Delay beyond 6–8 hours results in Volkmann's contracture and permanent loss of function. Per Bailey & Love and Indian orthopedic guidelines, fasciotomy must be performed emergently without waiting for imaging confirmation when clinical suspicion is high. This is a "treat the diagnosis, not the test" scenario. ## Why the other options are wrong **A. Administer opioid analgesics** — This is wrong because opioids mask the cardinal warning sign of compartment syndrome—pain out of proportion—and delay diagnosis. Analgesics do not address the underlying pathophysiology (elevated intracompartmental pressure). Compartment syndrome is a surgical emergency; pharmacological pain relief alone allows irreversible tissue damage to progress. NBE may trap students who think 'pain control first,' but in compartment syndrome, the pain is the diagnostic signal. **C. Apply a cast and schedule follow-up** — This is wrong because casting immobilizes the limb but does not decompress the compartment. Compartment syndrome progresses rapidly; waiting for follow-up allows muscle necrosis, rhabdomyolysis, and permanent contracture. The 6-hour window is critical—tissue damage becomes irreversible after 8 hours. This option represents delayed management, which is contraindicated in compartment syndrome per all Indian orthopedic protocols. **D. Elevate the limb and observe** — This is wrong because elevation may worsen compartment syndrome by reducing perfusion pressure across the compartment. Observation without intervention allows continued pressure buildup and tissue ischemia. The clinical signs (pain with passive stretch, neurological deficit) are diagnostic; observation is inappropriate. NBE may trap students who think 'conservative first,' but compartment syndrome demands immediate surgical decompression. ## High-Yield Facts - **Compartment syndrome** is a surgical emergency diagnosed clinically; pain with passive stretch + pain out of proportion + neurological deficit = fasciotomy without delay. - **Intact distal pulses** do NOT exclude compartment syndrome—pressure compromises microvascular flow and nerves before major arteries occlude. - **Deep peroneal nerve** (anterior compartment) loss causes sensory loss in first web space; this is a red flag for anterior compartment syndrome in tibial fractures. - **6–8 hour window**: Irreversible muscle necrosis begins after 6–8 hours; fasciotomy after this window may not prevent Volkmann's contracture. - **Fasciotomy indications**: Pain disproportionate to injury, pain with passive stretch, paresthesias, or paralysis—do NOT wait for compartment pressure measurement in Indian emergency settings. ## Mnemonics ****5 P's of Compartment Syndrome** (Late signs—don't wait for these)** Pain (disproportionate), Pressure (tense compartment), Paresthesias, Pallor, Pulselessness. Remember: Pain + passive stretch is the EARLY sign; pulselessness is LATE. Fasciotomy before the 5th P. ****STOP Compartment Syndrome** (Memory hook for action)** Surgical emergency, Time-critical (6–8 hrs), Operate immediately, Pulses may be normal. Use this to remember: compartment syndrome = immediate OR, not observation. ## NBE Trap NBE pairs "intact distal pulses" with "reassurance" to trap students into thinking vascular compromise is ruled out. In compartment syndrome, pulses remain intact until late stages—the trap is confusing compartment syndrome with arterial injury. The key discriminator is pain with passive stretch + neurological deficit, not pulse status. ## Clinical Pearl In Indian trauma centers, compartment syndrome is often missed because junior residents focus on fracture reduction and forget to assess compartment pressures clinically. The rule is simple: if a patient with a tibial fracture has pain out of proportion and pain with passive stretch, call the orthopedic surgeon for fasciotomy *now*—don't wait for imaging or pressure measurement. Volkmann's contracture is a devastating complication that ruins a young patient's hand/forearm function for life. _Reference: Bailey & Love's Short Practice of Surgery, Ch. 36 (Orthopedic Surgery); Harrison's Principles of Internal Medicine, Ch. 330 (Musculoskeletal Disorders)_