The Biomechanics of Back Pain by ischinca August 24, 2020 The vertebral bodies, the discs and the facet joints are critical elements of the spine. The weight of your body acts as a compressive and shear force on these elements. In younger people, the intervertebral discs bear most of this load. After the discs degenerate, more pressure is transferred to the facet joints in the back, causing arthritis in these synovial joints. Share FacebookTwitterPinterestEmail