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What deformity results from an extensor tendon central slip injury at or near its insertion onto the middle phalanx, leading to proximal interphalangeal (PIP) joint flexion and distal interphalangeal (DIP) joint extension?

A) Boxer's knuckle
B) Mallet finger
C) Boutonnière deformity
D) Gamekeeper's thumb

Answer :

Final answer:

The deformity resulting from an extensor tendon central slip injury is the Boutonnière deformity, causing PIP joint flexion and DIP joint extension. Therefore, the correct option is C) Boutonnière deformity.

Explanation:

The deformity that results from an extensor tendon central slip injury at or near its insertion onto the middle phalanx, leading to proximal interphalangeal (PIP) joint flexion and distal interphalangeal (DIP) joint extension is called the Boutonnière deformity. In this deformity, the central slip of the extensor tendon is disrupted, causing the PIP joint to flex and the DIP joint to hyperextend.

This deformity can occur due to trauma or conditions such as rheumatoid arthritis. It is usually diagnosed based on clinical examination and imaging studies. Treatment options include splinting, therapy, or surgery depending on the severity and underlying cause.

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