Which finding is MOST characteristic of acute compartment syndrome in the lower leg?

Which finding is MOST characteristic of acute compartment syndrome in the lower leg?

• A. Pulses are diminished with pain out of proportion
• B. Pain worsens with passive stretching
• C. Nerve function is always intact
• D. Imaging shows immediate bone edema

Answer: (B)

Acute compartment syndrome happens when pressure inside a leg muscle compartment rises after injury, cutting off blood flow. The telltale sign is severe pain that is out of proportion to exam, and especially pain that worsens with passive stretching of the muscles in the affected compartment. Passive stretching stretches the swollen, pressureed muscles, increasing ischemia and triggering more pain, so this finding is the strongest clue. Pulses can remain normal early on, so diminished pulses are not a reliable indicator on their own. Nerve symptoms can appear, but they are not guaranteed and may develop later. Imaging isn’t used to diagnose acute compartment syndrome because bone edema or other signs aren’t immediate or reliable indicators of the condition; it’s a clinical diagnosis supported by pressure measurements if uncertainty remains. Prompt recognition and relief of the pressure, typically with fasciotomy, are essential to prevent muscle and nerve damage.

Acute compartment syndrome happens when pressure inside a leg muscle compartment rises after injury, cutting off blood flow. The telltale sign is severe pain that is out of proportion to exam, and especially pain that worsens with passive stretching of the muscles in the affected compartment. Passive stretching stretches the swollen, pressureed muscles, increasing ischemia and triggering more pain, so this finding is the strongest clue.

Pulses can remain normal early on, so diminished pulses are not a reliable indicator on their own. Nerve symptoms can appear, but they are not guaranteed and may develop later. Imaging isn’t used to diagnose acute compartment syndrome because bone edema or other signs aren’t immediate or reliable indicators of the condition; it’s a clinical diagnosis supported by pressure measurements if uncertainty remains. Prompt recognition and relief of the pressure, typically with fasciotomy, are essential to prevent muscle and nerve damage.