Patients with knee arthritis who took medications for at least three years at reduced risk of needing surgeryTaking weight-loss drugs for at least three years could prevent thousands of knee replacements a year, research suggests.Globally, more than 500 million people have osteoarthritis. Knee arthritis is the most common form, affecting about 14 million people in the US and more than 5 million in the UK.

Many will require knee surgery. In the UK more than 120,000 knee replacements are carried out every year.

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