This was very helpful and immediately usable for a new client that I have with an S curve.  I'm checking my understanding of Ticktock/corkscrew here.

 Are you cuing differently to keep the alignment of the pelvis due to the scoliosis?  Or as you say it's more about hip joint movement so in order to facilitate the femoral head moving in the joint, she shortens and lengthens?    Thank you!