Could be a host of mechanical problems resulting from the sound of a "pop". It's hard to say without evaluating the child what is wrong. It might be a simple sprain (ligamentous) or a strain (muscular), a rib could have slipped. I would see a chiropractor to determine what is causing this. Children respond nicely to chiropractic care.
Posted By doc4bax on February 14, 2008 at 15:09:14:
In Reply to: low back pain
posted by clg on February 07, 2008 at 17:14:08: