A boutonniere (buttonhole) deformity is an injury to a tendon in one of the fingers, resulting in a deformed shape. This usually occurs after an impact to a bent finger.

A boutonniere deformity usually occurs after a direct impact to the middle finger bone. the middle finger joint may be forcefully flexed, causing a rupture of the extensor tendon. Less frequently, a cut to the upper surface of the finger tip may sever the attachment point of the tendon to the bone.

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Mr. Elliot Sorene MBBS FRCS (Tr & Orth) EDHS
is Consultant Orthopaedic, Hand & Upper Limb Surgeon at the following establishments:

The Hospital of St John & St Elizabeth 60 Grove End Road London NW8 9NH
The London Clinic 5 Devonshire Place London W1G 6HL
Spire Bushey Hospital Heathbourne Road Watford, Hertfordshire WD23 1RD