Which of the following statements is correct?
A) An avulsion of the flexor digitorum profundus is known as mallet finger.
B) A mallet finger presents with an inability to actively flex the distal interphalangeal joint (DIP).
C) Pseudoboutonnière deformities show with limited active and passive extension.
D) A rupture of the volar plate is known as a boutonnière deformity.

Question

Quizplus · Accepted Answer

Pseudoboutonnière deformities are characterized by limited active and passive extension, while a true boutonnière deformity is caused by a rupture of the central slip of the extensor tendon, resulting in an inability to actively extend the proximal interphalangeal joint (PIP) and a flexion deformity of the DIP. Options A and B are both related to mallet finger, but only option B is correct as it describes the characteristic inability to actively flex the DIP joint. Option D is incorrect as a rupture of the volar plate can lead to a volar plate avulsion fracture, not a boutonnière deformity.

Which of the Following Statements Is Correct