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Distal Femur loads in quadrupeds

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  • Distal Femur loads in quadrupeds

    I am doing some research trying to relate variations in bone growth
    to variations in mechanical stresses/strains in the rabbit distal femur.
    To identify the variations in mechanical parameters, 3-D finite element
    models have been developed, and estimations of typical loading patterns
    have been made. These estimations are largely based on a planar analysis
    of the rabbit gait, and dye-staining studies to identify joint contact
    areas. One of the difficulties associated with this is how to identify the
    medial/lateral variations in loading on the distal femur. I've done
    literature searches, but most studies consider the human knee joint, and
    I'm not sure how safe it is to translate the findings to the rabbit. I
    would be somewhat more comfortable with studies on other quadrupeds. So
    here are some questions:

    1.) Would you expect the tibio-femoral contact to be evenly distributed
    between lateral and medial condyles? If not - would the variation be as
    pronounced in the rabbit (or other quadrupeds) as in the human? (perhaps
    those of you using the canine for knee implant studies would have some

    2.) My dye-staining experiments indicate patello-femoral contact to be
    slightly toward the medial side of the groove. Can anyone help verify

    3.) Can anyone suggest literature which explores forces or joint
    contact in the knee (stifle) joint of a quadruped? (Rabbit would be great,
    but I'll take what I can get!)

    Please reply directly to me, and I will try to summarize the replies. At
    that time, I'll also share some of the results of my literature searches if
    anyone is interested.


    Amy Lerner
    Orthopaedic Research Labs
    400 N. Ingalls G-0161
    University of Michigan
    Ann Arbor MI 48109-0486