Artificial joints are medical devices used to replace damaged or worn-out joints in the body, such as the knee or hip. They are designed to restore mobility and reduce pain for individuals suffering from conditions like arthritis or injury. These joints are typically made from materials like metal, plastic, and ceramic, which are durable and biocompatible. The procedure to install an artificial joint is called joint replacement surgery. During this surgery, the damaged joint is removed and replaced with the artificial joint. Rehabilitation and physical therapy are often necessary afterward to help patients regain strength and movement in the affected area.