On Monday, May 16th I was walking my dear dog Echo. We were on a perfectly flat sidewalk. The weather was perfect. Echo was not pulling. I was wearing new boots that I had never walked very far in before. These boots have rubber soles. I think what happened is the rubber caught on the cement of the sidewalk, and caused me to trip and wobble. So badly, I fell hard to my left. As I fell, I relaxed as I learned years ago from my cycling coach. Nonetheless, as I hit the ground I heard a very loud snap.