Here are three scenarios:
This video above shows hip flexion greater than ninety degrees with the leg unloaded.
This picture video is hip flexion of greater than ninety degrees with the leg loaded through the knee and hip. Obviously the forces are different but why?
What occurs in video 2 that creates a precaution not needed in video 1 above?
Lastly, lets look at another video of hip flexion to ninety degrees.
Why is ninety degrees of hip flexion with the leg straight okay but not with a bent knee.
One thing we know is that squatting causes FAI type pain but, that standing hip flexion and the hip flexion of the SLDL don't. Is what we are trying to avoid joint loading vs joint angles? Another thing we know is that bilateral squatting is often more painful than unilateral versions?
Hoping for some really good forum responses.