our senior medical correspondent, elizabeth cohen explains. >>> hi. >> reporter: nicole loves shoes. from paris to payless, she has picked up more than 50 pairs, mostly stilettos and high heels. >> the style not the comfort. >> reporter: mi coal has been wearing heels since sixth grade and over the years her choice of footwear caused her a number of problems. >> i have bad knees broken my ankles a couple times and foot pain 24/7. i still wear them. >> reporter: bad news lead to plenty of foot injuries especially for women. yet many never associate their shoes with their podiatric pain. >> heel pain. bunion formation, and flare-ups. >> at temple university, school of podiatric medicine, they're testing shoe styles on feet. equipped with a runway, pressure plates and computer analysis. doctors use the data to better understand how different types of shoes put pressure on various points of the foot including the