Sacral stress fracture in a runner.

A female 10,000 metre runner, aged 28, presented with a 10 day history of pain of insidious onset in the right buttock. She had, 2 weeks before presenting, competed in a track race for selection to an international representative team, which she achieved. Five days after the race she had a 400 metre interval training session, following which she was conscious of the pain in the right buttock. She continued with her road training, but was aware that her stride was shortened due to the pain which worsened over the subsequent week. She was due to compete internationally some 6 weeks later.