![]() Not true! There's a well observed phenomenon that women in all walks of life, from hunter gatherers to NYC socialites, are capable of living well past our reproductive age. And typically, the first thing to start to go is the joint that was never really supposed to bear all our weight, but by the luck of the draw and some shoddy evolutionary adaptations that were only meant to last until we could pass our genes, it ended up doing so anyways - our knees.įrom an evolutionary perspective, the body serves no function once the prime reproductive age is over, and there's no evolutionary advantage to consume resources to maintain it if there's no way to pass on genes. So once you reach mid-20s to 30s, unless you work very hard to maintain your body, there will be a very natural decline in physical ability. Joints lose the cartilage or synovial cushioning, muscles begin to weaken, organ function slows, and many other events start to occur. Therefore, it naturally begins to break down in a lot of ways. From an evolutionary perspective, the body serves no function once the prime reproductive age is over, and there's no evolutionary advantage to consume resources to maintain it if there's no way to pass on genes. However, the biggest problem comes from, like /u/somethingclevereh said, we live much longer than we ever have, and the human body literally isn't evolved for that lifespan. Heavy friction from overexertion of joints can increase the wear and tear of the membrane or even directly damage it, which also causes problems. We have synovial fluid in a lot of joints, but only certain cells produce it, and as we age, like many processes, the production slows, or the synovial membrane, which holds the cells that produce the fluid, can be worn down and reduced. This fluid is necessary for the patella to move smoothly, which is a key part of its job. They are also coated in a lubricant called synovial fluid, which is more slippery and effective than just about any other lubricant that we know of. They're not directly attached to our skeleton instead, they're nestled into ligaments, and therefore are very easy to dislocate. Very few other animals have knee caps as well developed as humans do, and most don't have them at all. Here is a gif demonstrating how they help in our movement. Part of the problem is the knee cap, which is essential for smooth strides and shifting speeds, something that humans are remarkably good at. It's simply too much change to radically shift the overall structure to optimise the longevity of a joint that is constantly bearing so much weight, especially since humans haven't particularly 'evolved' much since we reached our current stage of evolution, tens of thousands of years ago. It's an unfortunate side effect of the randomness of evolution - in the process of becoming bipedal, a lot of changes occurred and our legs certainly became stronger, but the basic structure remains the same as when our distant ancestors were walking on all fours, or only occasionally rose to two legs. Knees are one of the most complex joints in the human body, which, combined with the fact that they are constantly bearing most of our weight, cause them to rapidly deteriorate. TL DR - Evolution caused our knees to suck, and we pay the price as we age.
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