Figure 5.25 Pelvic tilt and its association with spinal movement. As the pelvis tilts anteriorly, the spine extends (A1), decreasing the intervertebral foramen space and the area for the spinal nerve root (A2). A posterior pelvic tilt results in spinal flexion (B1), increasing the diameter of the intervertebral foramen (B2).
Superior Ilium sacral facets
Sacroiliac articulation
Sacrum A B
Figure 5.26 (A) Medial-lateral rotation at the sacroiliac joint. (B) Abduction-adduction at the sacroiliac joint. (From Houglum B, Bertoti, D. Brunnstrom’s Clinical Kinesiology, 6th ed. Philadelphia, PA: F. A. Davis Company, 2012: p. 332, with permission.)