A knee prosthesis is a medical device designed to replace a damaged or diseased knee joint. It is commonly used for patients suffering from conditions like arthritis or after severe injuries. The prosthesis can help restore mobility and reduce pain, allowing individuals to return to daily activities. Knee prostheses come in various types, including total knee replacements and partial knee replacements. They are typically made from materials like metal, plastic, and ceramic. The procedure to implant a knee prosthesis is usually performed by an orthopedic surgeon and involves careful planning to ensure proper fit and function.