DIAG 2730 The Sacroiliac Joint

DIAG 2730 The Sacroiliac Joint - Chapter27...

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    Chapter 27 The Sacroiliac Joint
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Overview The sacroiliac joint (SIJ),  the point of intersection  between the spinal and  the lower extremity joints  is the least understood  and, one of the most  controversial and  interesting areas of the  spine
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Anatomy The ilium, ischium, and  pubic bone fuse at the  acetabulum to form each  innominate Each of the two  innominates articulate  with the sacrum, forming  the sacroiliac joint, and  with each other at the  symphysis pubis 
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Anatomy The sacrum is a  strong and triangular  bone located  between the two  innominates Provides stability to  this area and  transmits the weight  of the body from the  mobile vertebral  column to the pelvic  region 
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Anatomy The articulating surfaces of the sacroiliac joint  differ The iliac joint surfaces are formed from fibrocartilage The sacral surfaces are formed from hyaline  cartilage.  The hyaline cartilage is 3-5x thicker than the  fibrocartilage  S/I joint = a synovial articulation, or diarthrosis 
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Anatomy The configuration of  the S/I joints is  extremely variable  from person to  person, and between  genders in terms of  morphology and  mobility These differences are  not pathological, but  are normal  adaptations 
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Anatomy Like other synovial  joints, the S/I joint is  reinforced by  ligaments, but the  ligaments of the S/I  joint are some of the  strongest and  toughest ligaments of  the body 
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Anatomy The anterior sacral ligament (ASL) is an  anterior-inferior thickening of the fibrous  capsule Relatively weak and thin compared to the rest  of the S/I ligaments Extends between the anterior and inferior  borders of the iliac auricular surface, and the  anterior border of the sacral auricular surface 
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Anatomy The interosseous ligament is a short  ligament located deep to the dorsal S/I  ligament Forms the major connection between the  sacrum and the innominate, filling the  irregular space posterior-superior to the  joint between the lateral sacral crest, and  the iliac tuberosity 
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Anatomy The dorsal S/I ligament  (long ligament)  connects the PSIS (and  a small part of the iliac  crest) with the lateral  crest of the S3 + S4 
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This note was uploaded on 11/23/2011 for the course DIAG 2730 taught by Professor Ronaldg.mayne during the Winter '11 term at Life Chiropractic College West.

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DIAG 2730 The Sacroiliac Joint - Chapter27...

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