FROM MY PT SCHOOL NOTES · FABIO · CHAPTER 17
What Does the Sacroiliac Joint Contribute to Load Transfer?
The pelvic ring connects the trunk and legs; sacroiliac mobility is relatively small, while load transfer is substantial.
Understand pelvic ring anatomy
The source describes the sacrum as a wedge between the ilia, with auricular articular surfaces and strong ligamentous support.
Surrounding muscles, ligaments and joint geometry contribute to stability and transmission of forces between the vertebral column and lower limbs.
Keep motion claims in proportion
The class introduces nutation and counternutation and notes limited SIJ rotational and translational movement.
These models should not be used to claim precise SIJ position can be reliably diagnosed from a simple visual or palpatory observation. The source itself notes diagnostic difficulty.
Reason through daily tasks
Walking and standing on one leg involve coordination of hips, lumbar spine and pelvic ring. The task changes external forces and balance demands.
Describe function and relevant findings instead of claiming a single ‘out-of-place pelvis’ explains a patient’s symptoms.
Check your reasoning: Can one posture photograph reliably establish tiny SIJ positional differences?
No. Motion is limited, measurement is challenging, and symptoms require a broader assessment.
Try the mechanics on a real task
Example: A student observes asymmetrical pelvic landmarks and concludes that the sacrum is ‘rotated out of place,’ explaining a patient’s pain.
Work through the reasoning
Answer: The sacroiliac joints have very small motions and are difficult to assess precisely by surface observation. The claim exceeds what this finding can establish; investigate history, function and other clinical evidence.
Common trap: Turning uncertain SIJ positional models into a specific diagnosis. Remember: Pelvic load transfer is useful to understand; tiny positional claims need evidence.
Source: my original FABIO Sacrum.pdf material, summarized as a free conceptual lesson. No third-party diagrams reproduced; this is not a patient-specific clinical protocol.
