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Partial Thenar Eminence Laceration: Immediate First Aid & Urgent Surgical Referral

A partial laceration of the thenar eminence (the muscular base of the thumb) is a hand surgery emergency. The thenar eminence contains the median nerve–innervated muscles (abductor pollicis brevis, flexor pollicis brevis, opponens pollicis) and the median nerve itself. Ulnar nerve supplies the deep head of FPB and adductor pollicis.

Immediate First Aid (Before EMS / ED Arrival)

  1. Control bleeding: Direct pressure with sterile gauze/clean cloth. Do not use a tourniquet on the forearm/arm for a hand wound—risks ischemic injury.
  2. Elevate hand above heart level to reduce bleeding and swelling.
  3. Immobilize: Splint wrist in 20–30° extension, MCP joints in 70–90° flexion, IP joints extended (intrinsic plus / "safe position"). Thumb abducted and slightly opposed.
  4. Do not: Explore wound, apply ointments, give oral fluids (may need anesthesia), remove embedded objects.
  5. Call 911 / proceed to ER with hand surgery coverage.

Why Urgent Specialist Care Is Critical

  • Median nerve injury: Even partial laceration causes thenar wasting, opposition loss, sensory deficit (radial 3.5 digits). Early repair (within 7–10 days) optimizes regeneration (1 mm/day).
  • Digital nerve injury: Radial digital nerves to thumb/index.
  • Tendon involvement: FPL, FPB, APB – loss of thumb flexion/abduction/opposition.
  • Vascular: Superficial palmar arch branches.
  • Compartment syndrome: Forearm/hand – monitor for pain out of proportion, paresthesia, pallor, pulselessness.

Emergency Department Workup

  • Neurovascular exam (document thoroughly: 2-point discrimination, Semmes-Weinstein, Tinel's at wrist/carpal tunnel)
  • X-ray (rule out fracture, foreign body)
  • Ultrasound / CT angiography if vascular injury suspected
  • Tetanus prophylaxis, IV antibiotics (cefazolin) if contaminated

Surgical Management

  • Exploration & repair under loupe/microscope: nerve (epineurial/grouped fascicular), tendon (core sutures), vessel.
  • Timing: Acute (within 24h) ideal; delayed (up to 2–3 weeks) possible for clean sharp lacerations.
  • Post-op: Immobilization 3–4 weeks → protected mobilization → sensory re-education, strengthening.

Functional Outcome Determinants

  • Age (<30 better), level (distal better), sharp vs. crush, time to repair, surgeon experience, rehab adherence.
  • Median nerve recovery: ~70–80% useful sensory/motor if repaired acutely.

Bottom line: Pressure, elevate, splint in safe position, urgent hand surgeon evaluation. This is not a "wait and see" injury.

This is first aid guidance, not a substitute for emergency medical care.

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