"Crisscrossing ligaments, articulating bones and cartilage, synovial membranes secreting lubricating fluid, tendons of muscles and friction-erasing bursa all converge at this minimalized ball-and-socket joint--to do what? To create the miracle of movement--to make fluid human locomotion. Bearing the weight of its owners body multiplied by the force of that body in movement, the knee is a divine phenomenon that when working well is taken for granted. but when the knee is injured or malfunctionin, its loss can escalate annoyance to grief and evoke a pain and discomfort beyond that attributed solely to the injury."
Jack E. Jensen