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Difficulty: HardOrthopedic Surgery

A 24-year-old man is evaluated in the hospital 12 hours after sustaining a closed, comminuted midshaft fracture of the right tibia. The fracture was stabilized with a well-molded, long-leg fiberglass cast in the emergency department. He now reports severe, unrelenting right leg pain that is poorly localized and unresponsive to intravenous opioid analgesia. Physical examination reveals a tense, swollen right calf and severe pain exacerbated by passive dorsiflexion of the right toes. Dorsalis pedis and posterior tibial pulses are easily palpable. Arrange the following management steps in the most appropriate chronological order.

  1. 1Bivalve the cast and divide all underlying circumferential padding down to the skin.
  2. 2Reposition the affected extremity to rest at the level of the patient's heart.
  3. 3Measure intracompartmental pressures using a handheld needle manometer system.
  4. 4Perform an emergent four-compartment fasciotomy in the operating room.
  5. 5Leave the surgical wounds open and apply sterile dressings or negative-pressure wound therapy.

Answer

The correct sequence is: Bivalve the cast and divide padding, position the limb at heart level, measure compartment pressures, perform a four-compartment fasciotomy, and finally leave the wounds open with appropriate dressings.
The clinical presentation is highly suspicious for acute compartment syndrome (ACS). The management sequence progresses from immediate, non-invasive bedside interventions to definitive surgical treatment and postoperative care. First, all external constricting materials (cast and padding) must be completely divided, which can significantly relieve pressure. Second, the limb must be kept at heart level; elevation decreases arterial perfusion pressure and worsens ischemia. Third, intracompartmental pressures are measured to confirm the diagnosis (delta pressure less than 30 mmHg). Fourth, definitive treatment is achieved through an emergent four-compartment fasciotomy. Finally, the surgical wounds must be left open to accommodate ongoing muscle swelling, utilizing dressings or negative-pressure wound therapy until delayed closure.

Step-by-Step Solution

1
Recognize the clinical presentation of acute compartment syndrome (ACS).
Identified pain out of proportion, pain with passive stretch, and a tense compartment despite palpable pulses.
Early recognition is critical; pulselessness is a very late and unreliable sign that only occurs after irreversible tissue damage.
2
Remove any external constricting materials.
The cast is bivalved and the underlying padding is completely divided.
External compression is a major contributor to elevated compartment pressures; removal provides the fastest immediate relief.
3
Optimize the physical positioning of the affected limb.
The leg is placed exactly at the level of the heart.
Unlike standard fracture management where elevation reduces edema, elevating a limb with ACS decreases arterial perfusion pressure, worsening muscle ischemia.
4
Objectively confirm the diagnosis if the clinical picture remains equivocal or before proceeding to morbid surgery.
Intracompartmental pressures are measured.
A delta pressure (diastolic blood pressure minus compartment pressure) of less than 30 mmHg confirms the need for surgery.
5
Execute definitive surgical and postoperative management.
Emergent fasciotomies are performed, and the wounds are left open.
Fascial release decompresses the tissues. Closing the skin immediately would recreate the compartment syndrome as the reperfused muscle continues to swell.

Key Concept

Diagnosis and stepwise management sequence of Acute Compartment Syndrome (ACS)
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Topics

Orthopedic Surgery

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