23rd Jun

2016

Sacroiliac Joint

The Sacroiliac joints
The sacroiliac joints (SIJs) are often referred to as being out and twisted which is a little slimmed down on information. Some details to remember
The sacrum is made of a number of vertebrae that are fused together.
The sacrum wedges between the two pelvic bones such that there are two SIJs – one left, one right immediately next to your buttock muscles.
The sacrum acts like a foundation stone wedging between the pelvic bones transferring forces from ground impact or from back movements.
Stability comes from FORM CLOSURE (the shape of the joint being similar to the number 7 in shape, a roughened joint surface surface, many ligaments around the joint) and FORCE CLOSURE (appropriate muscle tone and firing pattern around the joint).
When walking the SIJ on the standing leg is stabilised with muscle contractions and sacral motion in the joint whilst the other SIJ requires looseness to allow smooth swing of the other leg forward.
When assessing the SIJ Physiotherapists assess for slips, inflares, outflares, left/right squish, compression/distraction provocation tests for pain, biomechanical function on Stork, shunt and active SLR tests along with observing the sacral motion through lumbar movement.
it sounds complicated….

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