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(English captions by Andrea Matsumoto from
the University of Michigan)

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Ulnar collateral ligament stability can be
tested at 0 and 30 degrees by applying a valgus

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force to the elbow.

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Radial collateral ligament stability can also
be tested at 0 and 30 degrees of flexion by

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applying a varus force to the elbow.

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Laxity indicates partial or complete ligamentous
tear.