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

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Ulnar collateral ligament stability can be
tested at zero and thirty degrees of flexion

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by applying a valgus force to the finger.

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Radial collateral ligament stability can also
be tested at zero and thirty degrees of flexion

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by applying a varus force to the finger.

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Laxity indicates a partial or complete ligament
tear.