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Microfracture are tiny fractures in a bone caused when the force applied to a bone exceeds the strength of that bone. This can be achieved through strenuous activities such as running, dance, military training or gymnastics. The result is weakening of the bone which can result in a normal, complete bone breakage or macrofracture. When microfractures occur, the rate of bone formation by osteoblasts is outpaced by the normal osteoclastic bone destruction, as the osteoblasts are now having to form bone to fill cracks as well as their normal bone formation. Hence the bone is weakened and more susceptible to fracture under strain. However if the bone is given rest, osteoblastic activity can catch up and completely repair the bone.
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http://www.chm.bris.ac.uk/webproject...icrocracks.htm
Take a break for a few months and make sure you get 100% of your daily allowance of calcium every day.