Our knees do not get enough credit. They keep us upright, move us in rhythm to music, and help us carry heavy loads. Knees allow us to reach greater heights, giving us the ability to leap upward and over objects, launch into cannonballs, or dive off cliffs. Knees are essential also for absorbing the impact of a jump or a fall. They perform so many tasks for us that we don’t even give it a second thought most of the time, but they need special ...