How should a 45-year-old man, two weeks after minor trauma with a superficial posterior leg hematoma, localized tenderness, a firm gastrocnemius, and full distal pulses be managed?

Management of Superficial Leg Hematoma with Gastrocnemius Firmness

Conservative management with close monitoring for compartment syndrome is the appropriate approach for this patient, with serial clinical examinations every 4-6 hours during the first 24-48 hours to detect any progression to compartment syndrome.

Initial Assessment Priority

The presence of full distal pulses is reassuring and argues against acute compartment syndrome, but the combination of a firm gastrocnemius and localized tenderness two weeks post-trauma requires vigilant monitoring. The firmness likely represents organizing hematoma rather than acute compartment syndrome, given the timeline and preserved pulses 1.

Key Clinical Monitoring Parameters

You must serially assess for the "four P's" of compartment syndrome:

• Pain (spontaneous or with passive ankle dorsiflexion/plantarflexion)
• Pain with passive stretch (most sensitive early sign)
• Paresthesias (in superficial peroneal or tibial nerve distributions)
• Paresis (weakness of ankle/toe dorsiflexion or plantarflexion)

Critical pitfall: Pulselessness and pallor are late findings that indicate irreversible damage—their absence does NOT rule out compartment syndrome 1.

Specific Management Algorithm

Week 2-4 Post-Injury (Current Phase):

1. Clinical examination every 4-6 hours for first 24-48 hours, then daily if stable

2. Measure compartment pressures if any concerning signs develop:

   • Absolute pressure >30 mmHg, OR
   • Differential pressure (diastolic BP minus compartment pressure) <30 mmHg indicates need for fasciotomy 1

3. Check CPK levels: Elevation >1000 IU/L indicates rhabdomyolysis and warrants aggressive hydration 1

4. Conservative measures:

   • Rest and leg elevation
   • Avoid NSAIDs initially (may mask pain progression)
   • No compression wrapping (can increase compartment pressure)

Imaging Considerations:

Do NOT routinely image unless clinical deterioration occurs. If symptoms worsen or diagnosis is uncertain:

• Ultrasound can confirm hematoma location and size 2, 3
• MRI shows characteristic evolution: hyperintense on T1 in subacute phase (2+ weeks), heterogeneous on T2 3

VTE Prophylaxis Decision

Initiate pharmacological thromboprophylaxis with LMWH within 6 hours of presentation, given this is an isolated lower limb injury without active bleeding at 2 weeks post-trauma 1. The hematoma is superficial and organizing, making bleeding risk minimal while VTE risk remains elevated.

Red Flags Requiring Urgent Intervention:

• Development of any of the "four P's"
• Increasing firmness or tightness of the calf
• Progressive pain despite analgesia
• New neurological deficits
• CPK >5000 IU/L (suggests significant muscle injury) 1

Expected Timeline:

Most gastrocnemius hematomas resolve over 4-8 weeks with conservative management 3, 4. The firmness should gradually soften as the hematoma organizes and resorbs. Surgical evacuation is rarely needed unless compartment syndrome develops or the hematoma becomes infected.

Important distinction: This presentation differs from acute "tennis leg" (medial gastrocnemius strain), which occurs immediately after injury. At 2 weeks, you're managing an organizing hematoma, not acute muscle tear 2.