Why cant the knees stand up to the demands?
Any mechanical device can and will fail if placed under undo strain. Sometimes knee pain is the result of an accident, such as a fall down stairs or the knee being banged into a dashboard during a car accident. But this is in a relatively small percentage of cases. The vast majority of knee problems develop not from a single accident or fall, but rather over a period of years. In these cases, the knee becomes like a creaky or unstable hinge that doesnt get better, either because components in the knee are weak or unstable, or the lubricating pads and bone surface have been damaged over time. Thats the bad news. The good news is that of all the bum knees that come limping into doctors offices every year, only 20 percent will need surgery. Of those that dont need surgery, most will get better with time.
