Lower back pain represents as a common disorder, with between 60% and 80% of the general population being affected (Kirkaldy-Willis 1992:2). This, apart from just the health aspects, has serious financial implications which are an ongoing concern to industry (Frymoyer 1991: 137). This study was designed to determine the effectiveness of combined spinal manipulation and "Action Potential" therapy versus spinal manipulative therapy and placebo "Action Potential" therapy in the treatment of mechanical lower back pain. It is currently accepted that spinal manipulation is of great benefit in the treatment of lower back pain (Di Fabio 1992), and it appears that "Action Potential Simulation" therapy, a new low-frequency electrical current therapy, would fit the criteria necessary to address the dysfunctional phase of low back pain as set out by the authors such as Kirkaldy- Willis (1988).
