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Difficulty: Very hardOrthopedic Surgery

A 6-year-old girl is evaluated in the emergency department after falling from a trampoline onto her outstretched left arm. She is in significant distress and refuses to move her upper extremity. Vital signs are stable. Physical examination reveals a gross S-shaped deformity and severe swelling of the left elbow. The skin over the antecubital fossa is intact without puckering. Capillary refill in the left fingers is 1.5 seconds, and the hand is warm and pink. However, the left radial pulse is completely absent to palpation and cannot be detected with a hand-held Doppler device. Neurologic examination reveals an inability to actively flex the interphalangeal joint of the left thumb, but she is able to extend her wrist and fingers against resistance. Radiographs demonstrate a completely displaced, extension-type supracondylar fracture of the distal humerus. The patient is emergently taken to the operating room, where an anatomic closed reduction and percutaneous pinning are performed. Intraoperative fluoroscopy confirms perfect alignment and stable fixation. Immediate post-procedural evaluation reveals that the left hand remains warm and pink with a capillary refill of 1.5 seconds. However, the radial pulse remains undetectable by Doppler. Which of the following is the most appropriate next step in the management of this patient?

  1. Admit the patient for continuous clinical observation and neurovascular monitoringAnswer
  2. B
    Perform immediate surgical exploration of the antecubital fossa
  3. C
    Obtain computed tomography angiography of the left upper extremity
  4. D
    Remove the percutaneous pins and convert to an open reduction
  5. E
    Perform an immediate prophylactic volar forearm fasciotomy

Answer

The correct answer is to admit the patient for continuous clinical observation and neurovascular monitoring.
The correct answer is to admit the patient for continuous clinical observation. This patient presents with a 'pink, pulseless' hand after anatomic closed reduction and percutaneous pinning of a displaced supracondylar humerus fracture. The brachial artery is highly susceptible to spasm, kinking, or entrapment in these fractures. Following reduction, if the radial pulse remains absent but the hand is well-perfused (warm, pink, capillary refill under 2 seconds), it indicates that the rich collateral circulation around the elbow is providing sufficient blood flow to maintain limb viability. Current orthopedic guidelines recommend close clinical observation for a pink, pulseless hand post-reduction, as pulses often return within 24 to 48 hours as vasospasm resolves. Immediate vascular exploration is only indicated for an ischemic ('pale, pulseless') hand that does not improve after fracture reduction.

Step-by-Step Solution

1
Evaluate the post-reduction vascular status.
The left hand is warm and pink with brisk capillary refill, but the radial pulse remains absent (a 'pink, pulseless' hand).
To determine the adequacy of distal limb perfusion following the surgical intervention.
2
Determine the indication for vascular intervention.
Immediate vascular exploration is not indicated.
The presence of a warm, pink hand with capillary refill under 2 seconds indicates that collateral circulation around the elbow is providing sufficient blood flow for limb viability, despite the absent radial pulse.
3
Formulate the next best step in management.
Select close clinical observation.
In a well-perfused but pulseless extremity following anatomic reduction of a supracondylar fracture, conservative management with continuous monitoring is the standard of care as pulses typically return gradually as arterial spasm resolves.

Key Concept

Management of a pink, pulseless hand following reduction of a pediatric supracondylar humerus fracture.
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Orthopedic Surgery

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