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  • Diagram showing hamstring muscle and knee pivot.
    Rights: The University of Waikato Te Whare Wānanga o Waikato Published 21 June 2007 Size: 120 KB Referencing Hub media

    The load and weight of the lower leg produce a clockwise torque about the knee. The lower leg will rotate in a clockwise direction.

    If the hamstring muscle at the back of the upper leg contracts with a strong force, it produces an anticlockwise torque that holds the leg up.

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