Joint implants are medical devices used to replace damaged or worn-out joints, often due to conditions like arthritis or injury. These implants are typically made from materials such as metal, plastic, or ceramic and are designed to mimic the natural movement of joints, providing pain relief and improved function. The most common types of joint implants include those for the knee, hip, and shoulder. The surgical procedure to insert these implants is called joint replacement surgery, which can significantly enhance a patient's quality of life by restoring mobility and reducing discomfort.