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Answer :
Final answer:
The central slip of the extensor tendon maintains active DIP extension after a distal extensor tendon tenotomy for boutonniere deformity.
Explanation:
After distal extensor tendon tenotomy for boutonniere deformity, the central slip of the extensor tendon maintains active DIP (distal interphalangeal) extension. The central slip is a part of the extensor mechanism of the finger that crosses over the PIP (proximal interphalangeal) joint and inserts into the base of the middle phalanx. When the distal extensor tendon is tenotomized, the central slip continues to provide extension of the DIP joint.
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Final answer:
The oblique retinacular ligament maintains active DIP extension following a distal extensor tendon tenotomy for boutonniere deformity. Despite the changes in biomechanical aspects after this surgery, this ligament is crucial for regaining finger function.
Explanation:
After a distal extensor tendon tenotomy for boutonniere deformity, the oblique retinacular ligament maintains active distal interphalangeal (DIP) extension. In the healthy finger, the oblique retinacular ligament and the central slip both contribute to the extension at the DIP joint. When a tenotomy is performed, the oblique retinacular ligament becomes the primary structure enabling extension at this joint. Despite the different biomechanical aspects after a tenotomy surgery, the ligament is essential for regaining finger functionality.
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