Ilium sacral motion

The three principal kinds of motions that occur in the pelvis are sacral motions on the ilium, ilial motions on the sacrum, and pubic motions. 

The sacral motions on the ilium and the axes on which they occur are as follows ... 

The axes of sacral motion on the ilium are shown in Figure 57-4. 

There are no muscles that directly insert into both the sacrum and the ilium exclusively. Therefore, the usual facilitated positional release techniques do not apply. What will be described is a method for diagnosing sacral motion restriction on the ilium and a biomechanical technique to normalize the joint motion, if needed. 

Dysfunctions of motion created by the sacrum moving on the ilium are commonly unilateral anterior or posterior sacral dysfunctions, a unilateral shear of the sacrum along the articulation or oblique rotational sacral dysfunctions. If the fifth lumbar vertebra is not involved in the oblique rotation, the dysfunction is described as a sacral rotation dysfunction. if the fifth lumbar vertebra rotates in a direction opposite that of the sacrum, it is described as a sacral torsion. 

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