Tags: Disease.
Boutonniere deformity is a deformed position of the fingers or toes in which the joint nearest the knuckle (PIP) is permanently bent toward the palm while the farthest joint (DIP) is bent back away (PIP flexion with DIP hyperextension). It is commonly caused by injury or by an inflammatory condition like rheumatoid arthritis or genetic conditions like Ehlers Danlos Syndrome.
