Which specific contact point (SCP) is used while palpating a posterior glide on the ilium?

The correct contact point when palpating for a posterior glide on the ilium is the anterior superior iliac spine (ASIS). This specific point is anatomically significant as it allows the clinician to effectively assess the movement capabilities of the pelvis and its interaction with the spine. During a posterior glide, palpating at the ASIS provides insight into the ilium's orientation and mobility, as the ASIS is well-defined and serves as a clear landmark for assessing pelvic motion and alignment.

While the posterior superior iliac spine (PSIS) is another palpation point, it is primarily used for assessing posterior movements rather than a glide. The midline sacral apex, located at the base of the sacrum, serves a different purpose and is used more in examinations related to sacral motion. The bilateral mammillary processes are more relevant for spinal anatomy and do not directly correspond to the iliac movements in the same way that the ASIS does. Therefore, the choice of the ASIS is critical for proper assessment in this context.