Boutonniere deformity is a deformed position of the finger, in which the joint nearest the knuckle (PIP) is permanently bent toward the palm while the furthest joint (DIP) is bent back away (PIP hyperflexion with DIP hyperextension). It is commonly caused by injury or by an inflammatory conditions like rheumatoid arthritis.
Adapted from the Wikipedia article Boutonniere deformity, under the G. N. U. Free Documentation License. Please also see http://en.wikipedia.org/wiki
Boutonniere deformity – Introduction
Boutonniere deformity is a deformed position of the finger, in which the joint nearest the knuckle (PIP) is permanently bent toward the palm while the furthest joint (DIP) is bent back away (PIP hyperflexion with DIP hyperextension).
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