Tonight's healthcast looks into a running injury that is especially common for those pushing the pace of training.
Crutches were never a part of Christy Bertrand's race plan for a 5K last month.
Christy Bertrand says, "It was a less than two week time period we were going to try to do this and it would be the first time I ever competed in a 5K."
She has always been active, but running was something she hadn't done for several years.
Bertrand: "We had muscle strains and things like that, but expected to have sore muscles."
Race day started out great, but then came the pain.
Bertrand: "I was about two miles in and I started to get a pain in my left knee."
That pain only increased and eventually landed her in the care of a Surgeon.
Dr. Geoffrey Collins says, "It can go from nothing to running a couple of miles or running a couple of miles to training for an event where they really have to increase their distance. Bones are alive and they'll respond to stress if they're given an opportunity to do that. If you exceed that, then they fail."
They fail when they're pushed too hard, too fast.
Collins: "The way we run into trouble with stress fractures are patients who are sharply increasing their level of activity or beginning a new workout program."
Bertrand has gone from running, to walking with crutches and will have to rest for several weeks before her bones are ready again for the impact.
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