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Answer :
Final answer:
Boutonnière deformity involves the flexion of the proximal interphalangeal joint while the distal interphalangeal joint remains in extension. Recognizing this specific joint position is crucial for diagnosis. Treatment may involve splinting or surgery depending on severity.
Explanation:
Understanding Boutonnière Deformity
Boutonnière deformity is a condition characterized by a specific type of finger deformity where the middle joint (proximal interphalangeal joint) of the finger flexes while the outer joint (distal interphalangeal joint) extends. This results from an injury or rupture of the tendons that straighten the finger, most commonly seen in conditions such as rheumatoid arthritis or a traumatic injury.
Flexion Indication
The flexion of the proximal interphalangeal joint is what indicates a boutonnière deformity. Unlike the distal interphalangeal joint, which will be extended, and the other joints (such as the metacarpophalangeal and radiocarpal joints) that are not primarily involved in this deformity, the proximal interphalangeal joint is crucial in identifying the characteristic position of the finger.
Conclusion
In cases of boutonnière deformity, a clinical examination is important in assessing joint positions and understanding the underlying issues causing the deformity, which often necessitates treatments such as splinting or surgical intervention.
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