Psis Anatomy

Sacroiliac joint syndrome is a significant source of pain in 15 to 30 of mechanical low back pain sufferers. Pain commonly presents in the lower back above one or both of the posterior superior iliac spine also known as the psis.

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Psis anatomy. The posterior border of the ala shorter than the anterior also presents two projections separated by a notch the posterior superior iliac spine that serves for the attachment of the oblique portion of the posterior sacroiliac ligaments and the multifidus. And the posterior inferior iliac spinethat corresponds with the posterior extremity of the auricular surface. The sacrum is a larger triangle shaped bone that is positioned below the lumbar spine and between the two si joints.

The posterior superior iliac spine serves for the attachment of the oblique portion of the posterior sacroiliac ligaments and the multifidus. The posterior sacral ramus of the spinal nerve is the main nerve that innervates the sacroiliac joint. The anatomical landmarks that are commonly located and contacted to perform these tests include the anterior superior iliac spine asis the posterior superior iliac spine psis the iliac crest the sacral sulcus the sacral apex and the inferior lateral angle of the sacrum sila.

Below the posterior inferior spine is a deep notch the greater sciatic notch. Often these landmarks are tender to touch and swollen. Easy to feel just beneath the abdomen on the front of the hip the asis is the forward most point of the iliac crest the topmost lateral curve of the hipbone.

Mechanical dysfunction of the sacroiliac joint results in more pain and decreased mobility. The anterior superior iliac spine asis is a section of the ilium bone the large wing shaped bone of the pelvis. It refers to the anterior extremity of the iliac crest of the pelvis which provides attachment for the inguinal ligament and the sartorius muscle.

This article incorporates text in the public domain from page 234 of the 20th edition of grays anatomy 1918 external links. Those bony landmarks are called the posterior superior iliac spines psis and the sacroiliac joints are located just inside of the psis. California regulations require these documents to be part of pesticide handler and field worker training.

In addition to the lower back pain symptoms may present in the buttocks. Asis is a bony projection of the iliac bone and an important landmark of surface anatomy. Following imaging the mid line spinal levels identified by these palpated lines were recorded and the level of agreement kappa coefficient with the intercristal line formed by imaging of the iliac crests was assessed.

Prior to fluoroscopic imaging each patients surface anatomy was palpated by two examiners and lines created to form the palpated intercristal line and the posterior superior iliac spine line. The anterior superior iliac spine abbreviated.

Surface Anatomy Of Back