I see it all the time that well-worn comfy pair of shoes that many of the patients come in with on a regular basis. I ask the patients how old are these shoes? They say years… but as I go into my explanation about comfort vs proper function and it doesn’t matter if you are talking about a running, dress or a casual everyday shoe. The research shows that about every 300 to 400 miles the shoes should be replaced, even though they may not seem to be worn out. Shoes will show small wear patterns in the heel and mid/outsoles that can cause pain, dysfunction and stress on your lower joints (Ankle, Knees and Hips) and spine.