Cryotherapy-Induced Full-Thickness Digital Frostbite Injury Reconstructed With Reverse Cross-Finger Flap

Area of Science:

• Dermatology
• Plastic Surgery
• Hand Surgery

Background:

• Cryotherapy, commonly using liquid nitrogen, is a frequent treatment for viral digital warts.
• Complications from cryotherapy are rare, typically involving minor skin issues like dyspigmentation or temporary sensory disturbances.

Observation:

• A 37-year-old woman developed a full-thickness frostbite injury on her left ring finger after cryotherapy for a viral wart.
• The injury exposed and partially damaged the terminal extensor tendon.

Findings:

• The wound required debridement and reconstruction using a reverse cross-finger flap from the adjacent long finger.
• Post-operative assessment revealed excellent functional and cosmetic results.

Implications:

• This case highlights a rare but severe complication of cryotherapy for digital warts.
• Successful surgical reconstruction can restore function and appearance after extensive frostbite injuries involving tendons.