SPEAKER_04 10:46–12:16
Yes. Let's talk about this briefly because I think it'll be helpful for you. When you think about the anterior orientation, let's look at the pelvis for a moment. You've got five segments in the lumbar spine, correct? They don't all orient to the same degree at the same time; it's sequential. So if we're in wide ISA with anti-orientation, the sequence goes pelvis, L5, L4, L3, L2, L1. The greater the degree of compression, the greater the degree of anti-orientation, and the sequential loss of spinal motion will occur as well. So when you have somebody with a magnified measure, like 45 degrees of hip internal rotation, that's a lot—right? That indicates someone who still has a spine that can move in some segments. When there's reduction of both external and internal rotation, which indicates significant anterior-posterior compression and anti-orientation, all spinal motion starts to disappear. This is where you get people who come in and measure at things like 20 degrees of external rotation and 10 degrees of internal rotation. Do you understand?
spinal motionpelvic orientationhip range of motionsegmental motionspinal compression