I'd always been told (by medical professionals) that
knee pain of this variety is typically caused by
tracking issues, weak quads, tight hamstrings or some combination of the aforementioned factors.
In fact, anatomically, if you
track through the deepest core body, recruiting feet down, bent
knees, inner thighs up and back to deepen and widen the sitting bones, then articulating the psoas action of moving front sacrum and spine in and up as we gently roll to stack the pelvis and then add in more QL or deep lumbar support from the back is easeful, effective — and actually can mitigate SI
issues and back body line tension that can come from overuse of the erectors and hamstrings in yoga — or from coming to a standing position from the back body, which is made more for movement than support anyway.