Boutonniere deformity describes flexion at which joint?

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Multiple Choice

Boutonniere deformity describes flexion at which joint?

Explanation:
Boutonniere deformity happens when the central slip of the finger’s extensor mechanism at the proximal interphalangeal joint is damaged. This injury prevents the PIP from being extended, so the PIP remains flexed. At the same time, the lateral bands shift and can pull the DIP into hyperextension, which is why the DIP often appears extended rather than flexed. Among the joints listed, the flexed position characterizes the proximal interphalangeal joint, not the distal interphalangeal joint (which is involved in mallet finger), nor the metacarpophalangeal or carpometacarpal joints.

Boutonniere deformity happens when the central slip of the finger’s extensor mechanism at the proximal interphalangeal joint is damaged. This injury prevents the PIP from being extended, so the PIP remains flexed. At the same time, the lateral bands shift and can pull the DIP into hyperextension, which is why the DIP often appears extended rather than flexed. Among the joints listed, the flexed position characterizes the proximal interphalangeal joint, not the distal interphalangeal joint (which is involved in mallet finger), nor the metacarpophalangeal or carpometacarpal joints.

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