In imbalance, the SPL participates in creating, compensating for and maintaining twists, rotations, and lateral shifts in the body
Dysfunction in SPL will easily affect function in other lines such as SBL, SFL, LL, and deep back arm line due to sharing muscles with those lines
The overall function is to create and mediate spirals and rotations in the body, and to steady the trunk and leg to keep it from folding into rotational collapse
