STP1182

    Prediction of the Loading Along the Leg During Snow Skiing

    Published: Jan 1993


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    Abstract

    The complete force and moment on each cross section of the leg between the ski boot top and the knee during normal skiing were predicted from measurements of the force and moment under the toe and heel of the boot and the flexion of the ankle. The force and moment components predicted at the base of the boot were significantly different from those predicted at sites of potential injury at the boot top and the knee. The extreme torsional and extreme varus-valgus moments predicted at the knee over all subjects tested were 70 Nm and 149 Nm, which are within the estimated range of the ultimate strength of the knee without support from contracted muscles crossing the knee.

    Regression analyses were used to find the force components at the base of the boot that best predict the bending and torsional moments at the boot top and knee. The torsional moments at the boot top and knee are better predicted by the medial-lateral force at the toe than by the medial-lateral force at the heel. The varus-valgus moment at the boot top and knee are better predicted by the resultant medial-lateral force component at the base of the boot than by the medial-lateral force at the toe or by the medial-lateral force at the heel. The set of forces that includes the force normal to the ski at the toe, the force normal to the ski at the heel and the component of the total force normal to the ski directed perpendicular to the leg was better at predicting the anterior-posterior bending moments at the boot top and knee than the force normal to the ski at the heel or the force normal to the ski at the toe or a linear combination of those two forces.

    Keywords:

    ski injury, extreme force and moment, lower leg, ski binding, regression analysis, ankle flexion


    Author Information:

    Quinn, TP
    Graduate Student, Professor, and Vice Chancellor, University of California, Berkeley, CA

    Mote, CD
    Graduate Student, Professor, and Vice Chancellor, University of California, Berkeley, CA


    Paper ID: STP25565S

    Committee/Subcommittee: F27.10

    DOI: 10.1520/STP25565S


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