Female volunteers (age ≥ 21 years) that are not frequent user of high heeled shoes (i.e. not longer than 6 hours/month with heels > 3 cm) will be included. Exclusion criteria are osseous metastases, missing written informed consent, cognitive inability to consent on their own, and pregnancy. Based on own preliminary studies, a sample size of 19 (+3 to anticipate drop outs) patients is aimed for.