About the Sacroiliac (SI) Joint
The sacroiliac joint serves as a shock absorber and distributes vertical loads from the lumbar spine to the lower extremities during bending movements. The SI joint may be the main source of pain, or dysfunction at the joint or surrounding structures may affect the joint’s load transfer function and produce a painful stimulus.
Causes of Sacroiliac Joint Pain
Sacroiliac joint pain can be associated with osteoarthritis or inflammatory conditions such as post-traumatic arthritis, ankylosing spondylitis and other spondyloarthropathies. Similarly, mechanical faults at the pubic symphysis or SI joint can result in pelvic asymmetry or joint instability.