Assessing Spinal Extension

[@mattpenman2284]

I often don't follow your terms. How does a pelvis flex? The hips flex. The lumbar spine can flex. At around 7:20 you say that 'the rib cage flexes, with flexion of the pelvis'. I don't get it, I have been in the anatomy/rehab/biomechanics world for over a decade and never head of the pelvis being flexed - unless referring to the pelvis being flexed on the hips (hip flexion), of on the lumbar spine (lumbar flexion). But in this example both hips and lumbars are extended - so in what sense can the pelvis be flexed?

[@integratedkineticneurology8525]

Pelvic flexion = anterior tilt & pelvic extension = posterior tilt. These are described like this in certain biomechanical papers to describe the interaction between pelvis & femoral segments (pelvic flexion/extension angles etc). Because when you say “hip flexion,” do you mean the pelvis is moving or femur? It can be confusing when describing relationships. Hip = interaction between the pelvis & femur. That is a “joint” based analysis & we use a “segment” based analysis. The pelvis will anterior tilt /flex relative to the thoracic spine/ribcage to allow the lumbar spine to extend, and this will allow the thoracic spine/rib cage to extend together. If you posterior tilt/extend the pelvis, it will flex the lumbar spine, making it difficult to distribute that extension across the spine In the last video, the pelvis shifts forward & flexes/APT, but you can see that the rib cage/thoracic spine doesn’t extend..this limits the extension across the lumbar spine (potentially concentrating it at the lower lumbar spine)