Figure 4From: Spinal lordosis optimizes the requirements for a stable erect postureNorm of the local joint torques || CT|| necessary for an equilibrium at each of the five lumbar spinal segments, as a function of the geometrical arrangement of the spine, according Equation 1. The contours enclose the spinal arrangements where the local joint torques do not exceeding ±30 Nm at any spinal segment. Position A - D: see Figure 3.Back to article page