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Answer :
Final answer:
Swan-neck deformity is the condition where weak capsular ligaments at the MCP joint cause a 'bowstring' effect in the extensor digitorum tendons, leading to a characteristic deformity of the finger seen in conditions such as rheumatoid arthritis.
Explanation:
The hand deformity that presents due to weak capsular ligaments at the metacarpophalangeal (MCP) joint, causing a "bowstring" effect of the extensor digitorum tendons, is known as the Swan-neck deformity. In this condition, hyperextension of the proximal interphalangeal (PIP) joint and flexion of the distal interphalangeal (DIP) joint occur, giving the finger a characteristic swan-like appearance. This issue is often seen in conditions like rheumatoid arthritis, where it is caused by the imbalance between the intrinsic and extrinsic muscles of the hand due to weakening of the ligaments.
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