| The SI or Sacroiliac joint is between the tailbone
(sacrum) and the hip bone (ilium). Unlike other joints, it doesn't move
around allot. Instead, it's a viscoelastic joint that gets it's movement
by giving or stretching. The amount of movement in this joint has been
controversial, with some studies saying it moves allot, while others
saying it doesn't move that much. Either way, since it's most important
function seems to be acting as a shock absorber for the spine by
stretching in different directions, the actual amount of movement is
probably not that important. |
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This 1804 illustration shows the
location of the SI Joint. |
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This more recent image shows how
the forces from the legs and the spine meet at the SI joints. |
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