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Related to Boutonniere deformity: mallet finger, swan neck deformity
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Our results showed that ROM limitations associated with wrist flexion and extension along with the total number of PIPJs as well as the presence of piano key sign and boutonniere deformity were more commonly observed in the right hand.
5) If the rupture of the central extensor tendon is undetected or simply not treated, a Boutonniere deformity, in which the PIP joint is flexed and the DIP joint is hyperextended, is the likely result?
A Boutonniere deformity is a more severe presentation of this condition, and is essentially a hooding deformity with a fixed distal inter-phalangeal joint extension contracture.