Discomfort, aching or stiffness concentrated in the lower back, resulting in the impairment of physical activity.

At least once in their lives, about 80 percent of all Americans will experience low back pain that can range from a dull, annoying ache to absolute agony. On any given day, over 6.5 million Americans are under some sort of treatment for low back pain.

Low back pain is one of the most common ailments in the U.S., and it is preceded only by colds and the flu for time lost from work. Low...