Where to begin....
SI joints: It's a girl thing. Seriously. In 10 years I've only had 2 men with SI problems. They were big traumas (a fall for one, and I think a rugby tackle for the other). Because it's a girl thing, it got neglected for a long time. Treatments are starting to pick up and it's being recognized as an issue.
What causes the problem: Heck if I know. If you figure it out, tell me. No, really, it's largely because women have wider pelvises and sharper angles at the thighbone so force gets directed in wonky ways. SI joints are kind of like those expansion joints you see in the floor in big buildings. They aren't hinges, they aren't ball-and-socket. They're more like what you'd get if you tried to glue a broken dinner plate back together with a thick pad of rubber cement; something that can move in all kinds of ways, but not very far.
How does it move: in-flare, out-flare, upslip, downslip, anterior rotation, posterior rotation... and that's just ONE bone of the joint (the ilium). The other bone has it's own motions it can do relative to the ilium. These babies shift slightly all the time, even when you breathe. The problem comes up when they shift and get stuck, and it gets worse when the muscles in the neighborhood panic and try to hold everything still by getting very tense. The body doesn't know what is wrong, it only knows that joint HURTS and so tries to lock it down and not use it.
How do I tell which way mine got stuck: Ask your PT or orthopod. The pelvis is a big ring with only 3 "expansion joints" and movement at one effects the other two. It's very funky.
Does it matter: No. Well, I take that back. It matters if someone is measuring at a bony landmark of your pelvis trying to see if you have a leg length difference. If the pelvic bones are shifted the measurement will be off. It helps to know which way they went so you can decide if a leg length based on them is valid.
to be continued...



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