Shoe wear is an interesting investigate tool. The most easily observed wear, sole wear, is the result of friction due to foot motion relative to the ground, not

Shoe wear is an interesting investigate tool. The most easily observed wear, sole wear, is the result of friction due to foot motion relative to the ground, not force. Midsole compression and heel counter distortion better correspond to force pattern, but they are integrative and themselves affect gait. Seems like you'd want both for a good model.