| Term | Definition |
|---|
| Sacroiliac Joint (SI Joint) | Between the auricular surface of the sacrum and the aurcular surface of the ilium; Synovial Joint; Considered a plane joint, but with very irregular surfaces for stability; Allows very little movement, except durinf childbirth; Transmits weight from the spine to the LE's; Designed to be very stable, with several thick ligaments |
| Nutation | Superior sacrum tilts anteriorally |
| Counternutation | Inferior sacrum tilts anteriorally |
| Anterior & Posterior Sacroiliac Ligaments | Reinforce joint capsule |
| Interosseous Sacroiliac Ligament | Directly between sacrum and illium on posterior half of joint. Half Synovial and half fibrous |
| Iliolumbar Ligament | Connects illium to vertebrae L4 & L5 |
| Sacrotuberous Ligament | Sacrum to ischium tuberosity |
| Sacrospinous Ligament | Sacrum to ischial spine |
| Pubic Symhysis | The 2 pubic bones are joined together by fibrocartilge, and the joint is supported by the superior, inferior, and posterior pubic ligaments; There is normally very little movement at this joint, except during childbirth |
| Anterior Pelvic Tilt | ASIS moves anteriorally, increased lumbar lordosis, hip flexion (good sitting posture) |
| Posterior Pelvic Tilt | ASIS moves posteriorally, decreased lumbar lordosis, hip extension (slouched sitting posture) |
| Hip Hiking | Lateral tilt of pelvis, naturally occurs with walking, open chain, hip abduction |
| Pelvic Rotation | Occurs naturally during walking and when turning the body |
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