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Answer :
B. Ulnar deviation, swan neck, and boutonnière deformities, is the characteristic joint deformity seen in Rheumatoid Arthritis (RA) affecting the fingers.
The deformities are:
- Ulnar Deviation occurs when the fingers bend towards the ulna, which is the bone on the outer side of the forearm. This deviation is due to chronic inflammation and joint damage.
- Swan Neck Deformity is characterized by hyperextension of the proximal interphalangeal (PIP) joint and flexion of the distal interphalangeal (DIP) joint. It gives the finger a swan-like appearance.
- Boutonnière Deformity involves flexion of the PIP joint and extension of the DIP joint. It is caused by damage to the extensor tendons over the PIP joint.
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