Which signs indicate compartment syndrome requiring urgent fasciotomy?

• A. Severe pain out of proportion to exam
• B. Paresthesias
• C. Pallor
• D. Pulselessness

Answer: (A)

Severe pain out of proportion to the exam is the earliest and most telling sign that compartment pressure is compromising tissue perfusion and that fasciotomy may be urgently needed. This pain is out of proportion because the ischemia from rising pressure hurts more than would be expected from the visible swelling or exam findings, and it often worsens with passive stretching of the affected muscles.

Paresthesias can occur as nerves become ischemic, but they aren’t as reliable early indicators and may appear later. Pallor and pulselessness are late signs; a limb can still have a strong pulse even with dangerous pressure, and relying on these alone can delay treatment.

Because time is critical to prevent muscle necrosis and nerve damage, a high index of suspicion based on severe disproportionate pain drives urgent management, with pressure measurements used to confirm only when the diagnosis is uncertain.