Good Morning,
Fair point Eric, I'm sure we couldn't (yet, hopefully it may change in the future!) provide a 'perfect' model for FEA and a compromise that is clinically useful is needed, it just depends on the amount of error we're willing to accept. Kevin M, I also agree with your point on FEA models treating the midfoot as a rigid body, and with reference to Kevin K and Jeff's discussion on FEA, the models developed will only be as useful as the the variables we enter into the FEA software. In engineering, a certain grade of steel (e.g.) is tested in a number of ways in order to develop an FEA model, so in an FEA model of the foot (static or dynamic) it is necessary to input variables from cadavers and feet for example.
Lee Murphy
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