Your question, involving how a young child develops problems such as protruding discs and a stress fracture of S2, is a very challenging question to answer quite frankly. At times, we as health care providers, are faced with such cases without any apparent reason for why they occurred unnoticed.
At such a young age, it is highly possible that the "trauma" to the area occurred without your knowing, and at times children can be completely oblivious to incidents without being able to recall them. It is important to note that most experts agree that visual diagnostics can at times produce results that are not congruent with the symptoms of the patient. For example, if 100 random individuals were given MRI's, over 90 percent would likely show a form of abnormal finding, however, these individuals may or may not have symptoms. Disc bulges and protrusions come and go, taken sometimes as little as a few months to reabsorb.
It seems the most important finding here is the stress fracture of S2. Your doctor may be able to provide more information based on the location of how it may have occurred.
Nevertheless, the primary factor that must be addressed is postural and muscle imbalances that can cause increased disc stress, particularly because you mentioned that she has pain only during running.
Sam Visnic NMT
www.endyourbackpainnow.com/blog
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