Answer :
Final answer:
The Boutonniere deformity is a hand deformity caused by a rupture in the central tendinous slip of the extensor hood, resulting in characteristic flexion of the PIP joint and hyperextension of the DIP joint. The correct answer is A. Boutonniere deformity.
Explanation:
The hand deformity that is due to a rupture within the central tendinous slip of the extensor hood is known as Boutonniere deformity. Boutonniere deformity describes a medical condition in which the finger is flexed at the proximal interphalangeal joint (PIP) and hyperextended at the distal interphalangeal joint (DIP). This is usually a result of trauma in the acute setting and is caused by a rupture of the PIP central slip.
This condition occurs when the central slip of the extensor tendon is damaged, typically from a forceful flexion injury to the finger or direct trauma to the dorsum of the finger. The deformity is characterized by flexion of the proximal interphalangeal (PIP) joint and hyperextension of the distal interphalangeal (DIP) joint, resembling a buttonhole (or "boutonniere") appearance.
