I am confused of the pelvic position when  a person has a kypholordosis or sway back. Is the pelvis in anterior pelvic tilt or posterior pelvic tilt or it can be either. Sahrmann looks at this pelvis  as  posterior pelvic tilt position. I looked at the PRI pelvic manual and PEC/Patho PEC are both anterior inlets in flexed position which I think is anterior pelvic tilt. Is the PEC/Patho PEC equivalent to the same pelvis in a swayback posture/kypholordosis posture?

You are correct that both the PEC and Patho PEC are in the same position in the anterior inlet of flexion/abduction/ER.  The Patho PEC, however maximizes more of an end-range in this position.  These individuals will stabilize themselves with ligaments and/or joints in addition to musculature because of this end-range position.  They hang out on their Y ligaments and to counteract this they can stabilize themselves through their thoracic spine and develop kyphosis overtime.  They look "sway" back, however they are still in an anterior pelvic tilt with + Bilateral Adduction Drop Tests to verify this position.

-Lori Thomsen, MPT, PRC