# Ulnar deviation

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Hand deformity

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Hand affected by Ulnar deviation

**Ulnar deviation**, also known as **ulnar drift**, is a hand [deformity](/source/Deformity) in which the swelling of the [metacarpophalangeal](/source/Metacarpus) joints (the big knuckles at the base of the fingers) causes the fingers to become displaced, tending towards the little finger.[1] Its name comes from the displacement toward the [ulna](/source/Ulna) (as opposed to [radial deviation](/source/Anatomical_terms_of_motion#Abduction_and_adduction), in which fingers are displaced toward the [radius](/source/Radius_(bone))). Ulnar deviation is likely to be a characteristic of [rheumatoid arthritis](/source/Rheumatoid_arthritis),[2] more than of [osteoarthritis](/source/Osteoarthritis). Consideration should also be given to [pigmented villonodular synovitis](/source/Pigmented_villonodular_synovitis), in the setting of ulnar deviation and metacarpophalangeal synovitis. [*[citation needed](https://en.wikipedia.org/wiki/Wikipedia:Citation_needed)*]

Ulnar deviation is also a physiological [movement of the wrist](/source/Anatomical_terms_of_motion#Abduction_and_adduction), where the hand including the fingers move towards the ulna. Ulnar deviation is a disorder in which flexion by ulnar nerve innervated muscles is intact while flexion on the median nerve side is not.[*[citation needed](https://en.wikipedia.org/wiki/Wikipedia:Citation_needed)*]

## References

1. **[^](#cite_ref-1)** Strike, Sophia A.; LaPorte, Dawn M. (2017-01-01), Frank, Rachel M.; Forsythe, Brian; Provencher, Matthew T. (eds.), ["Chapter 14 - Closed Reduction Forearm and Wrist (Adult)"](https://www.sciencedirect.com/science/article/pii/B9780323390385000147), *Case Competencies in Orthopaedic Surgery*, Elsevier, pp. 131–137, [doi](/source/Doi_(identifier)):[10.1016/b978-0-323-39038-5.00014-7](https://doi.org/10.1016%2Fb978-0-323-39038-5.00014-7), [ISBN](/source/ISBN_(identifier)) [978-0-323-39038-5](https://en.wikipedia.org/wiki/Special:BookSources/978-0-323-39038-5), retrieved 2024-02-02{{[citation](https://en.wikipedia.org/wiki/Template:Citation)}}: CS1 maint: work parameter with ISBN ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_work_parameter_with_ISBN))

1. **[^](#cite_ref-2)** Biese, JEANINE (2007-01-01), Cooper, Cynthia (ed.), ["Chapter 17 - Arthritis"](https://www.sciencedirect.com/science/article/pii/B0323033865500205), *Fundamentals of Hand Therapy*, Saint Louis: Mosby, pp. 348–375, [doi](/source/Doi_(identifier)):[10.1016/b0-32-303386-5/50020-5](https://doi.org/10.1016%2Fb0-32-303386-5%2F50020-5), [ISBN](/source/ISBN_(identifier)) [978-0-323-03386-2](https://en.wikipedia.org/wiki/Special:BookSources/978-0-323-03386-2), retrieved 2024-02-02{{[citation](https://en.wikipedia.org/wiki/Template:Citation)}}: CS1 maint: work parameter with ISBN ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_work_parameter_with_ISBN))

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