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Internal-external stability test wrench with a 12.0 in. (30.48 cm) lever arm. Rotation between the wrench and the boot peg is constrained by a 4 mm (5/32 in.) wide rectangular channel running along the anterior surface of the boot peg and a rectangular key. During testing, the handle of the wrench is located directly anterior to the fork to prevent the application of unwanted varus-valgus moments during tests of internal-external stability.
