ABPS Surgery Of The Hand Practice Questions - ABPS Hand Surgery Examination (HSE) - Subspecialty Certificate In Surgery Of The Hand Exam

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A patient presents with isolated weakness of intrinsic hand muscles supplied by the ulnar nerve but with NORMAL sensation in the small finger. The compression most likely localizes to which zone of Guyon canal?

Zone 1 (proximal — mixed motor and sensory) Zone 2 (deep motor branch only) Zone 3 (superficial sensory branch only) None — must be cubital tunnel

Correct Answer:

Zone 2 (deep motor branch only)

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