knee replacement knee replacement

Arthritis is a joint disease that can cause cartilage destruction and erosion of the bone, as well as tendon inflammation and rupture. Affected areas are highlighted in red in this enhanced X-ray. Philippe Sellem/Paul Demri/ Voisin/Science Source hide caption

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Philippe Sellem/Paul Demri/ Voisin/Science Source

6,000-Year-Old Knee Joints Suggest Osteoarthritis Isn't Just Wear And Tear

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Employees at all Lowe's home improvement stores, including this one in South San Francisco, Calif., are eligible to have certain surgeries paid for by the company at selected hospitals. Justin Sullivan/Getty Images hide caption

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Justin Sullivan/Getty Images

Some Firms Save Money By Offering Employees Free Surgery

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An anatomical drawing shows the ligaments on the outside surface of the knee. The anterolateral ligament connects the thigh bone to the shinbone. Courtesy of University Hospitals Leuven hide caption

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Courtesy of University Hospitals Leuven