Back in the 1980's I sustained repetitive traumas to my feet (12 to 15 occurrences of leaping off of a rapel tower). Over the following year, my feet, ankles, and heels continued to hurt without improvement. Also during that year, my boot size went from 10.5 to 12. It eventually stopped at size 13. I have since been diagnosed with bilateral flat foot, PTTD, bone spurs, and arthritis in my ankles.