I stepped on a nail through my shoe; how should I clean the wound, manage tetanus prophylaxis, and treat possible infection?

Nail Puncture Wound Management

For a nail puncture through a shoe, you need tetanus prophylaxis with Tdap (if ≥5 years since last dose or unknown history), thorough wound irrigation, and close monitoring for infection—consider early surgical evaluation if symptoms develop, as these wounds carry high risk for deep infection and foreign body retention. 1, 2

Immediate Wound Care

• Irrigate thoroughly with sterile saline or tap water to remove debris and potential Clostridium tetani spores—there is no evidence that antiseptic irrigation is superior to these options 3
• Remove the shoe and inspect for retained foreign material, as 25% of patients requiring surgery for nail punctures through rubber-soled shoes have foreign bodies extracted during operation 2
• Do not probe the wound blindly; if deep infection or foreign body is suspected, consider ultrasonography for detection 2
• Debride any devitalized tissue to create aerobic conditions unfavorable for anaerobic bacterial growth 1

Tetanus Prophylaxis Decision

This is a tetanus-prone wound (puncture wound with potential soil/dirt contamination), so apply the ≥5 year rule, not the ≥10 year rule for clean minor wounds 1, 4

If vaccination history is known and complete (≥3 doses):

• Give Tdap if ≥5 years have elapsed since last tetanus-containing vaccine 1, 4
• Tdap is strongly preferred over Td if you've never received Tdap or Tdap history is unknown 1
• No tetanus immune globulin (TIG) needed if you have completed primary vaccination series (≥3 documented doses) 1

If vaccination history is unknown or incomplete (<3 doses):

• Give BOTH Tdap AND TIG 250 units IM at separate anatomical sites using separate syringes 1
• Treat unknown vaccination history as zero previous doses 1
• Start or complete the primary series: Tdap now, then Td or Tdap ≥4 weeks later, then Td or Tdap 6-12 months after the second dose 1

Antibiotic Considerations

• Consider prophylactic antibiotics for nail punctures through shoes, particularly rubber-soled shoes, due to risk of deep infection with Pseudomonas aeruginosa and other organisms 2, 5
• First-line option: amoxicillin-clavulanate for broad polymicrobial coverage 4
• Alternative: fluoroquinolone with anaerobic coverage for deep puncture wounds 5
• Early presentation (within 2-3 days) is associated with better outcomes; delayed presentation (median 10 days) correlates with treatment failure 2

Red Flags Requiring Urgent Surgical Evaluation

• Seek immediate care if you develop:
  • Increasing pain, redness, warmth, or swelling after 24-48 hours 2, 5
  • Fever or systemic symptoms 2
  • Inability to bear weight 2
  • Purulent drainage 5
• The operated group in one study had longer duration from injury to admission (5.0 days vs 2.7 days), suggesting delayed presentation increases likelihood of requiring surgery 2
• Diabetic patients warrant special attention as they are at higher risk for complications and tetanus from foot wounds—25% of tetanus cases in diabetic patients result from foot ulcers or gangrene 6

Common Pitfalls to Avoid

• Do not delay tetanus prophylaxis when >5 years have elapsed for tetanus-prone wounds 1, 4
• Do not assume the wound is superficial—nail punctures through shoes frequently cause deep infection requiring surgical debridement 2
• Do not give TIG to patients with documented complete primary vaccination series unless severely immunocompromised 1
• Do not wait for signs of infection to seek care if the wound was deep or you're diabetic—early evaluation prevents limb-threatening complications 2, 6
• Wounds can be safely wetted within 24-48 hours after initial treatment without increasing infection risk 3