Traumatic boutonnière deformity as a cause of acute hammer toe: a case report.

Traumatic boutonnière deformity, well-described when occurring in the fingers, can occur in a lesser toe. The deformity mimics that of a hammer toe, but the onset is acute, and develops immediately after trauma. Open repair of the central slip rupture and recentralization of the displaced lateral bands of the extensor mechanism with temporary pinning of the toe can give an excellent result.