Most of us have experienced a painful bout of low back pain brought on by a seemingly innocuous movement such as bending over to pick up a pencil or a dropped set of keys. These painful episodes may last a couple of days or be more severe and last more than a week. We're left wondering, "What exactly

"There I am," a very fit patient is saying, "out on my five-mile run, motoring my way up a steep incline. Suddenly, I feel a throbbing pain in the middle of my right shin. Oh, no, I think, not again." As things turned out, the patient recovered from the shin splints1 quickly, but he knew he'd dodged