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The sacroiliac joint or SI joint (SIJ) is the joint between the sacrum and the ilium bones of the pelvis, which are connected by strong ligaments. In humans, the sacrum supports the spine and is supported in turn by an ilium on each side. The joint is strong, supporting the entire weight of the upper body.
Sacroiliac joint dysfunction is an outcome of either extra-articular dysfunction or from intraarticular dysfunction. SI joint dysfunction is sometimes referred to as "sacroiliac joint instability" or "sacroiliac joint insufficiency" due to the support the once strong and taut ligaments can no longer sustain.
The major function of the interosseous sacroiliac ligament is to keep the sacrum and ilium together. [2] This prevents abduction or distraction of the sacroiliac joint. [2] It also helps to bear the weight of the thorax, upper limbs, head, and neck. This is performed by the nearly horizontal direction of the fibers running perpendicular from ...
For example, lower back pain that stems from the lumbar spine, the sacroiliac (SI) joint, or a pinched nerve in the back, could be confused for hip pain, says Thomas. While rare, ...
The SI joint is a common source of pain for cyclists. Here’s exactly what to do, including SI joint exercises, to avoid the aches. The SI Joint Could Be Causing Your Lower Back Pain—and We ...
Anatomy figure: 13:03-04 at Human Anatomy Online, SUNY Downstate Medical Center – "Deep muscles of the gluteal region with gluteus medius and maximus muscles removed." Anatomy figure: 17:02-05 at Human Anatomy Online, SUNY Downstate Medical Center – "Posterior view of the bones and ligaments of the hip joint."
The posterior border of the ala, shorter than the anterior, also presents two projections separated by a notch, the posterior superior iliac spine and the posterior inferior iliac spine.
This article incorporates text in the public domain from page 309 of the 20th edition of Gray's Anatomy (1918) Morris, Craig E. (2005). Low Back Syndromes: Integrated Clinical Management. McGraw-Hill. ISBN 0-07-137472-8. Huijbregts, Peter A. (2001). "In: Current Concepts of Orthopaedic Physical Therapy". Lumbopelvic region: Anatomy and ...
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