Boutonniere Deformity: Difference between revisions
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== Definition == | == Definition == | ||
It is a deformity of the fingers or toes in which the proximal interphalangeal joint is flexed and the distal interphalangeal joint is hyperextended. | It is a deformity of the fingers or toes in which the proximal interphalangeal joint is flexed and the distal interphalangeal joint is hyperextended. | ||
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== Mechanism == | == Mechanism == | ||
If the central slip of the digital expansion is ruptured, minimal deformity results as long as the transverse fibers of the expansion remain in tact. If they are also torn, a deformity is produced at the PIP joint, which the English-speaking orthopaediccommunity calls the boutonniere deformity whereas the French call it the buttonhole.In this case, all extensor force will be transmitted to the distal phalanx by intact lateral bands, producing hyperextension of the DIP joint. The PIP joint buckles into flexion and protrudes through the breech in the extensor hood. The two lateral bands will now run on the palmar aspect of the PIP joint and will exaggerate flexion.<ref>Darlene Hertling and Randolph M. Kessler,Management of common musculoskeletal disorders.4th ed,1983.</ref> | If the central slip of the digital expansion is ruptured, minimal deformity results as long as the transverse fibers of the expansion remain in tact. If they are also torn, a deformity is produced at the PIP joint, which the English-speaking orthopaediccommunity calls the boutonniere deformity whereas the French call it the buttonhole.In this case, all extensor force will be transmitted to the distal phalanx by intact lateral bands, producing hyperextension of the DIP joint. The PIP joint buckles into flexion and protrudes through the breech in the extensor hood. The two lateral bands will now run on the palmar aspect of the PIP joint and will exaggerate flexion.<ref>Darlene Hertling and Randolph M. Kessler,Management of common musculoskeletal disorders.4th ed,1983.</ref> | ||
Revision as of 18:43, 27 March 2018
Original Editor - Esraa Mohamed Abdullzaher
Top Contributors - Shreya Pavaskar, Wanda van Niekerk, Adu Omotoyosi Johnson, Esraa Mohamed Abdullzaher, Uchechukwu Chukwuemeka and Kim Jackson
Definition[edit | edit source]
It is a deformity of the fingers or toes in which the proximal interphalangeal joint is flexed and the distal interphalangeal joint is hyperextended.
Mechanism[edit | edit source]
If the central slip of the digital expansion is ruptured, minimal deformity results as long as the transverse fibers of the expansion remain in tact. If they are also torn, a deformity is produced at the PIP joint, which the English-speaking orthopaediccommunity calls the boutonniere deformity whereas the French call it the buttonhole.In this case, all extensor force will be transmitted to the distal phalanx by intact lateral bands, producing hyperextension of the DIP joint. The PIP joint buckles into flexion and protrudes through the breech in the extensor hood. The two lateral bands will now run on the palmar aspect of the PIP joint and will exaggerate flexion.[1]
The deformity is the result of a rupture of the central tendinous slip of the extensor hood and is most common after trauma or in rheumatoid arthritis.[2]
