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(English captions by Jade Cheng from the Universtiy of Michigan)

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Ulnar collateral ligament testing of the thumb
is performed to evaluate for instability found

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on a gamekeeper's or skier's thumb.

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After stabilizing the first metacarpal, a
valgus stress is applied to the thumb at the

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metacarpophalangeal joint.

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Laxity indicates a partial or complete ulnar
collateral ligament tear.