Cartilage acts as a cushion between joints to allow for smooth movement and helps to prevent bones rubbing together (ouch). It contracts and expands like a foam sponge each time weight is applied to a joint. It compresses a little when a step is taken and then expands to return to its resting state. The cartilage in our knees (which we will refer to as a foam sponge) is saturated with synovial fluid, a clear viscous liquid. The sponge soaks up this fluid and squeezes it out with each step we take during the day and lubricates the cartilage, allowing us to move freely. This repetitive action of filling and wringing stimulates cartilage growth and repair.

Since cartilage does not have blood vessels that can supply nutrients for growth and repair, it must rely on condrocytes (cartilage making cells) within the synovial fluid to provide nourishment. And, it is through the repetitive stressors from weight bearing exercises that chondrocytes are formed. These condrocytes receive the nutrients from the synovial fluid and produce more cartilage. So it is actually through regular and consistent range of movement and weight bearing exercise, such as jogging or walking, that we maintain good cartilage health and help to prevent osteoarthritis from occurring as we age. “Move it or lose it” is more than just an adage when it comes to healthy knees.

The Better Life Experts | November 16, 2009

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