Cool stuff on number 5. I would like to say that on a theoretical mathematical model, that the calves and hamstrings supporting the load would seem to creat even more tension in the cruciate and platellar ligaments in a lever effect. However one should note that the ligaments are strongest in tension. Applied with extremely heavy weight it would magnify. Perhaps the point of wrapping the joints could further prevent any shift of movement that could serve as a critical point of shear force, such as bending inward or outward.
