BASIC SCIENCE OF ARTHRITIS PAINJoints can handle some heavy pressure. For example, knees handle a force of three to four times a person’s total body weight on average just talking a walk. The force of a deep knee bend during a squat can increase to nine times the body weight. So just imagine multiplying weight of more than 150 pounds times a minimum of three or four, and then even more. That can sure add up to a lot of heavy work on knee joints over time.
Now for the science of this scenario. Where two bones meet, called the joint, the bone ends are covered with cartilage, also known as gristle. This cartilage is sturdy, elastic and spongy or compressible, and keeps the bones from moving against each other at the joint. The cells of this cartilage, called chondrocytes, are thought to be the longest living cells of the body. Surrounding the bones and cartilage is strong, fibrous capsule lined with synovium, a thin membrane that lubricates the joint area with fluid. The end result is less friction or smoother rubbing together of the bones. This fluid also feds the cartilage cells, keeping them healthy, and is “pumpedâ€
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