Boutonnière Deformity
Pronunciation: boo-ton-YAIR dih-FOR-mih-tee
A finger deformity characterized by flexion at the PIP joint and hyperextension at the DIP joint.
Full Definition
Boutonnière deformity is a specific pattern of finger deformity resulting from disruption of the central slip of the extensor tendon at the proximal interphalangeal (PIP) joint. The term "boutonnière" means "buttonhole" in French, referring to the appearance of the lateral bands herniating through the defect in the central slip. This creates the characteristic posture of PIP joint flexion and distal interphalangeal (DIP) joint hyperextension. The deformity can result from trauma, rheumatoid arthritis, or other conditions affecting the extensor mechanism.
Usage
Usage note: French term meaning "buttonhole"; may include diacritic (boutonnière). Distinguish from swan neck deformity.
In Context
- "The patient developed a boutonnière deformity following central slip rupture." — Hand surgery consultation
- "Chronic boutonnière deformity required tendon reconstruction and joint mobilization." — Operative report