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.
Also, Know
Z-deformity i.e. the radial deviation of the wrist with ulnar deviation of the digits, often with palmar subluxation of proximal phalanges.
‘Swan neck deformity’ i.e. hyperextension of PIP joints with compensatory flexion of the distal interphalangeal joints.
Wind sweep deformities of toes i.e. valgus deformities of toes in one foot and varus in other, (as Wind sweeps all the structure in one direction).
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