I don't see how it's possible after doctors have been doing autopsies, cutting open bodies and literally dissecting a human body for probably several hundred years, that this could just now be discovered. Very strange. They do knee replacement surgeries and complete knee reconstructions, how could they not have seen this, but a doctor from 1879 knew about it. Very strange indeed. Hope it helps with future surgeries, but hard to understand how this can be newly discovered.