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A member asked:
Which extensor muscle is assosciated with hammer thumb deformity.
A doctor has provided 1 answer
Extensor pollicis : Longus. But if your thumb is "hammering" it might actually be triggering and that has to do with the flexor tendon getting hung up in the a1 pulley at the base if your thumb on the palmar aspect of your hand.
Answered 2/26/2013
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