Which listing uses medial PSIS contact?

• A. PIEX
• B. PIIN
• C. IN
• D. AS

Answer: (C)

In this style of chiropractic listing, the hand position and the direction of the thrust are tied to the specific subluxation pattern. Medial PSIS contact means placing the contact on the inner (medial) edge of the posterior superior iliac spine and directing the force toward the midline of the pelvis. The IN listing is the one that uses that medial PSIS contact because its adjustment vector is oriented toward the midline from a posterior approach. Other listings specify different contact points or directions (for example, contacting a different part of the PSIS or using a lateral or posterior-lateral approach), so they do not employ the medial PSIS contact.