Influence of pubic symphysis stiffness on pelvic load distribution during single leg stance

This study focuses on the influence of the softening and stiffening of pubic
symphysis on the load distribution within the bones of the pelvic ring under
the physiological loadings of the single leg stance. Muscle forces and joint reaction
forces were first determined by inverse dynamics and applied to a linear
finite element model of the pelvis. With normal pubic symphysis stiffness, high
Von Mises stresses are located on the anterior surface to the sacrum around
the sacroiliac joint and on the superior ramus, both on the side of the weightbearing
leg. Softening of the pubic symphysis redirects the load backward,
decreases the stresses at the anterior pelvis, and increases them at the posterior
pelvis. A stiffening of the pubic symphysis redirects the load forward, increases
the load on the posterior pelvis, and decreases them at the anterior pelvis. This
investigation highlights the significance of the pubic symphysis on the load
distribution of the pelvis and in maintaining the integrity of the structures. Its
role should not be neglected when analyzing the pelvis.