In a patient status post open reduction internal fixation (ORIF) of the left distal radius three days ago after a work injury, who now has swelling above a tight surgical dressing at the elbow that improved after loosening the dressing and applying icing, should compartment pressure measurements be obtained?

Compartment Pressure Measurement Was Not Necessary in This Case

In your patient 3 days post-ORIF with swelling above the elbow that improved after loosening a tight dressing and icing, compartment pressure measurement was not indicated, and your clinical management was appropriate. The improvement with dressing adjustment and conservative measures effectively ruled out evolving compartment syndrome.

Clinical Reasoning

Why Compartment Pressures Were Not Needed

Your patient's presentation does not meet the criteria for compartment syndrome assessment. The key distinguishing features are:

• Timing: At 3 days post-op, you are outside the critical 24-hour window when compartment syndrome typically develops after trauma or surgery 1
• Response to intervention: The rapid improvement with dressing loosening and icing indicates the swelling was extrinsic compression from the tight dressing, not intrinsic compartment pressure
• Location: Swelling above the surgical site at the elbow, rather than in the forearm compartments themselves, suggests venous congestion from constriction rather than compartment syndrome

When Compartment Pressure Monitoring IS Indicated

According to guidelines for severe limb trauma, compartment pressure measurement (target: >30 mmHg absolute, or differential pressure <30 mmHg) should be considered when 1:

Risk factors present:

• Fracture (your patient has this)
• Crush injury
• Hemorrhagic injury or reperfusion
• Hypotension

AND clinical signs during first 24 hours:

• Pain (spontaneous or with passive stretch) - the most sensitive early sign
• Tension in compartments
• Paresthesia
• Paresis

Critical monitoring window: Every 30 minutes to 1 hour during the first 24 hours after injury/surgery 1

Important Caveats

The "5 P's" pitfall: Pulselessness and pallor are late signs that indicate irreversible compartment syndrome - their absence does NOT rule out the diagnosis 1. The meaningful early signs are the "4 P's": pain, pain with passive stretch, paresthesia, and paresis.

Clinical signs have limitations: Low sensitivity but high negative predictive value 1. This means clinical examination alone can miss compartment syndrome, especially in:

• Sedated patients
• Patients with altered consciousness
• Obtunded or intoxicated patients

Your Management Was Correct

You appropriately:

1. Recognized abnormal swelling
2. Identified the tight dressing as the likely culprit
3. Loosened the constricting dressing immediately
4. Applied conservative measures (icing)
5. Confirmed clinical improvement

This demonstrates proper recognition that iatrogenic compression from dressings can mimic compartment syndrome but responds to simple intervention. The patient's reported improvement confirms your clinical judgment was sound.

What Would Have Required Pressure Measurement

You should measure compartment pressures if:

• Pain worsens or fails to improve with dressing removal
• New onset of pain with passive finger/wrist extension
• Development of paresthesias in median, ulnar, or radial nerve distributions
• Weakness in finger or wrist extension/flexion
• Tense, firm forearm compartments on palpation
• Any concern within the first 24-48 hours post-injury/surgery

If pressures were measured and showed >30 mmHg or differential pressure <30 mmHg, emergency fasciotomy would be required 1.