I appreciate that at times anatomy and applying anatomy to yoga can be confusing and at times unnecessary. I have seen people with little to no knowledge of anatomy flourish in their asana practice. In fact the individuals who I feel have furthered their asana practice more than anyone else, progressed without any anatomy knowledge at all. They progressed with only a book (Light on Yoga - B.K.S Iyengar) and a steadfast willingness to improve. However, there are some of us who with our various injuries, need to apply some anatomical understanding to our poses. Because if we don't, we are likely to reinjure or just not progress. And progress is what we are constantly striving for in our asana practice. Without the goal of progress in our minds, we are not really practising yoga.
The understanding of our Vastus Medialis, as described below helps us understand what muscles help stabilise our knee when in standing poses. This is essential in keeping the knee safe. When we fail to u