Answer :
Final answer:
A boutonniere deformity, which affects the fingers and makes them bent in a distinctive shape, is most likely caused by rheumatoid arthritis or hand injuries.
Explanation:
A boutonniere deformity refers to an abnormality that generally affects the fingers, in which the middle joint of a finger bends inwards while the other joints bend outwards, resembling the shape of a boutonniere, or a buttonhole in French. This deformity is most likely caused by rheumatoid arthritis, a chronic inflammatory disorder affecting the joints, as well as injuries to the hand or fingers. Rheumatoid arthritis leads to imbalance in the tendons of the fingers causing this deformity.
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