“Applied Teaching 2: The SI Joint in Janu Sirsasana
Have your student practice the seated forward bend, Janu Sirsasana (Figure 7.11). Ask her permission to touch her. Then kneel behind her and feel her ilia and her sacroiliac joint. This pose is an asymmetrical one and therefore can cause torque at the sacroiliac joint. Make sure that she rolls forward into the forward bend, especially from the ilia of the bent knee side. In other words, have her create the forward bend not by bending over her straight leg but rather by reaching and bending forward from the bent knee side ilium, thus reducing the torque over her SI joint.
Many students stretch forward from the spine of the bent knee side, but this tends to separate the vertebral column/sacrum from the pelvis, which is left behind by this focus. Instead, make sure your student bends forward from the pelvis itself around the concavity of the femoral head to move the ilium, sacrum, and column together. To add some extra help, wedge the edge of a folded towel under the upper, outer area of the back thigh of the bent leg.”引自 第7章 骶骨 解剖学练习