|Classification and external resources|
|ICD-10||L62.8 (ILDS L62.810)|
In racquet nails (also known as "brachyonychia," "nail en raquette", and "racquet thumb") the nail plate is flattened, the end of the thumb is widened and flattened, and the distal phalanx is abnormally short.:786 In racquet nails, the width of the nail bed and nail plate is greater than their length.:657 The condition is painless and asymptomatic.
Racquet nails usually occur on one or both thumbs, but may appear on all fingers and toes. It may be genetic, inherited as an autosomal-dominant trait,:786 or it may be acquired. Genetic disorders associated with racquet nail include Larsen syndrome, Brooke-Spiegler syndrome, Rubinstein-Taybi syndrome, Hajdu–Cheney syndrome, cartilage-hair hypoplasia, pycnodysostosis, acrodysostosis and brachydactylia.
Racquet nail often presents with other nail conditions such as onycholysis, koilonychia, pachyonychia, Muehrcke's lines, leuconychia and half-and-half nails. Cosmetic surgery can be used to improve the appearance of the nails. 
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- James, William; Berger, Timothy; Elston, Dirk (2005). Andrews' Diseases of the Skin: Clinical Dermatology. (10th ed.). Saunders. ISBN 0-7216-2921-0.
- Freedberg, et al. (2003). Fitzpatrick's Dermatology in General Medicine. (6th ed.). McGraw-Hill. ISBN 0-07-138076-0.
- Baran,, Robert; de Berker, David; Holzberg, Mark; Thomas, Luc (July 23, 2012). Baran and Dawber's Diseases of the Nails and their Management (4th edition ed.). Wiley-Blackwell. ISBN 978-0470657355. Retrieved 27 June 2014.
- Baran, R.; Turkmani, M.G.; Mubki, T. "Acquired Racquet Nails: a Useful Sign of Hyperparathyroidism". Wiley Online Library. Journal of the European Academy of Dermatology and Venereology. Retrieved 27 June 2014.
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