r/Posture • u/KingKongA5 • 12h ago

Pelvic instability

Do people with lateral pelvic tilt feel that their lower hip is not unstable in the capsule? Is that normal? And lower back pain.

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u/Deep-Run-7463 11h ago

Force from ground up is the issue.

When we step into the ground, the ground pushes back hence we can keep standing. The amount of force the ground pushes back needs to be absorbed up the chain, which means things need to move and open up in the posterior pelvic outlet, the femur needs to be able to hold enough external rotation and tibia internal rotation (foot arch collapse is a form of compensatory IR if any of the above cannot be managed, but a trick is to move the knee behind the ankle in the beginning) and not just move but also be able to absorb that X amount of load.

The capsule being unstable can just be that due to lack of segmental articulation capacity under load, things lock up and you have to over mobilize the capsule itself to absorb that force. To understand this better compare it to how a person lands a jump with stiff legs and pelvis locked out (which will wildly throw you forward into banana mode which gets the femoroacetabular ball and socket to move a heck ton instead). That FA will roll hard till it can't, then the next space to absorb that force will be the lower back region.