Low back pain afflicts roughly two thirds of all adults at some time, making it second only to upper respiratory problems as the leading health care complaint in America [1]. Often low back pain goes undiagnosed. Association of symptoms with imaging results is weak [2]. Thus, “If...an anatomical diagnosis for low back conditions is impossible 80%–90% of the time, being able to differentiate normal spinal function from what is abnormal may be fundamental in creating a diagnosis based on spinal function rather than aberrant anatomy” (page 57) [3].

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