What is my joint replacement prothesis made of?

The joint replacement prosthesis is designed to mimic the function of a healthy joint, allowing patients to regain their mobility and reduce pain. In this blog post, we will discuss the materials used to make joint replacement prostheses and how they contribute to the functionality and longevity of the device.

• Metal: The most common material used in joint replacement prostheses is metal. Metal components, such as the femoral and tibial components of a knee replacement prosthesis, are typically made of cobalt-chromium alloy or titanium. These metals are strong, durable and biocompatible, meaning they do not cause an adverse reaction in the body. Titanium, for example, is lightweight, corrosion-resistant, and has excellent biocompatibility. Cobalt-chromium is stronger and more durable than titanium, making it ideal for heavy use joints like hips. Stainless steel is an affordable and robust option, often used in some knee prostheses.
• Polyethylene: Polyethylene is a type of plastic that is commonly used in total hip and knee prostheses. It is often used to create the bearing surface of the implant, which is the part of the implant that moves against another surface. Polyethylene is used in the knee replacement prostheses as the articulating surface that glides against the metal components; it is often used as the liner component of total hip prostheses. It is a durable material that can withstand the wear and tear of daily use. It is also easy to mold into various shapes, making it ideal for creating complex joint replacement components.
• Ceramics: Ceramics including zirconia and alumina, are also commonly used in total hip prostheses. Ceramics are known for their biocompatibility, high wear resistance and low friction properties. They are also able to withstand high loads without deforming and can withstand high temperatures without breaking down, making them a suitable choice for this type of application. They also have a low friction coefficient, making them resistant to wear and tear. However, ceramic materials are more brittle than metal, which can increase the risk of fracture.

You can find a labeled diagram of the various components of a hip replacement prosthesis here: https://boneandjointsurgery.org/specialties/hip-replacement/

You can find a labeled diagram of the various components of a knee replacement prosthesis here: https://boneandjointsurgery.org/specialties/knee-replacement/