Pincer Nail

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Involuted Nail (pincer nail; omega nail)

Excessive transverse curvature of nail – can affect both sides or one side of nail.
Predisposes to onychophosis and onychocryptosis

3 types:
1) Tile shaped – bulk of surface of nail is relatively flat, but both edges are curved/involuted, but do not go past perpendicular (least painful type)
2) Plicatured – bulk of surface of nail is relatively flat, but one or both edges are curved/involuted beyond vertical and embedded in nail sulcus
3) Pincer – entire nail plate is involuted – nail plate is drawn up between edges; in severe cases, lateral edges almost meet, pinching soft tissues giving the appearance of a ‘cylinder’ (most painful type)

Aetiology:
May be familial. Could be due to subungual exostosis.
Acquired case may be due to pressure from shoes.
May occur with other conditions (eg yellow nail syndrome)

Treatment:
Minor cases  usually asymptomatic, so correct nail cutting advice is often all that is needed.
Severe cases  usually symptomatic  nail cutting and clear sulcus of debbis; wire nail braces to flatten nail; total or partial nail avulsion

http://www.podiatry-arena.com/podiatry-forum/showthread.php?t=101720

https://onlinelibrary.wiley.com/doi/pdf/10.1002/cia2.12036

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