Answer :
Final answer:
A laceration of the extensor tendon that results in Boutonnière's deformity typically occurs in zone 3, which corresponds to the central slip of the extensor tendon over the proximal interphalangeal joint.
Explanation:
An extensor tendon laceration that leads to Boutonnière's deformity typically occurs at the Central Slip, which is the portion of the extensor tendon that inserts at the base of the middle phalanx. The Boutonnière deformity itself is characterized by a flexion of the proximal interphalangeal joint and an extension of the distal interphalangeal joint of the finger. This particular type of injury commonly occurs around the zone 3 area, which corresponds to the central slip of the extensor tendon over the proximal interphalangeal joint. Given the importance of the extensor mechanism, proper diagnosis and treatment are crucial for restoring hand function.
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