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Knee arthritis? Exercise can help manage the pain

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Knee osteoarthritis, which develops in four stages as cartilage in the joint wears down, is a long-term condition that cannot be reversed.

Knee osteoarthritis, which develops in four stages as cartilage in the joint wears down, is a long-term condition that cannot be reversed.

PHOTO: PATRICIA VOULGARIS/NYTIMES

Jen Murphy

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NEW YORK – Nearly 20 per cent of Americans aged 45 and older have knee osteoarthritis. Worldwide, the number is predicted to increase nearly 75 per cent by 2050, because of ageing, population growth and obesity.

Knee osteoarthritis is a long-term, degenerative condition that cannot be reversed. It develops in four stages as cartilage in the joint wears down, eventually leaving the bones to grind against each other and causing symptoms such as stiffness, swelling and a persistent ache around the joint.

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