Why are knee joints so vulnerable to breakdown with aging?

The meniscus - cartilage that's especially vulnerable to injury - works as a key shock absorber in the knee. Your knees each have two shock absorbers that form the shape of the C - called the medial and lateral menisci. They should be plump like grapes, not dried out like raisins.

Over the years, cartilage in the knee can break down and the joint may have too little synovial fluid to keep it properly lubricated. This can lead to bone-on-bone contact in the knee. Knee surgery is often needed to correct it.

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