"From our data it seems clear that discs are not a significant cause of low back pain and that SIJ dysfunctions are a very common cause of low back pain."
Shaw 1992
"The sacroiliac joint is 20 times more vulnerable to axial compression and twice as susceptible to axial overloading as lumbar segment… these are the forces created by bending, lifting and twisting.
"The study seems to support the contention that SIJ syndrome has a high incidence in the failed back syndrome."
"SIJ dysfunction has been demonstrated to be the major biomechanical cause of lumbar disc degeneration."
"In our study of 1,000 consecutive patients with low back pain, 98% had a mechanical dysfunction of the sacroiliac joints as a major cause of their LBP."
"The presence of unilateral low back pain alerts the clinician that a patient may have a sacroiliac problem."
"Of 88 patients with low back pain, 71 (88%) had evidence of SIJ dysfunction... 73% of the 71 had unilateral low back pain."
"If a dysfunction of the SIJ’s were to compromise the movement of the sacrum, this would cause a considerable increase in the shear forces on the disc."
"SIJ dysfunction has been demonstrated to be the major biomechanical cause of lumbar disc degeneration."
"In sports requiring repetitive, unidirectional movement, pelvic shear and/or torsional force is understandable." (torsion as in golfing or bowling; shear as in skating or braking during an accident).
"The sacroiliac joint is reported as a common source of low back pain in school children."
"A large belt force is not recommended because it can cause irritation and edema and it may be detrimental. The proper tension would approximate that used to tie ones shoe."
"If the SIJ is incompetent, and the nervous system is intact, the muscle strength to control pelvic position will be inhibited due to the reflex activity (ligamental-muscular reflex). We can measure muscle strength. SIJ incompetence can be implied by diminished motor performance of muscles which control pelvic position."
"Leg length differences may be the prime cause of SIJ complaints."
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