A new collection of infographics illustrate in shocking visual detail, what a negative effect vertiginous shoes have on our body. The diagram shows how wearing high heels places excess force on the inside of the knee - a common site of osteoarthritis among women. One study found that knee joint pressure increased by as much as 26 per cent when a woman wears heels. Heels also cause calf muscles to contract and adjust to the angle of the high heels and the muscles may shorten and tighten.