Which non-metallic material is commonly used in orthopedic implants?

Polyethylene is commonly used in orthopedic implants due to its excellent biocompatibility, durability, and wear resistance. As a non-metallic polymer, it plays a crucial role in load-bearing applications, particularly in joint replacements such as total hip and knee arthroplasties. Polyethylene can withstand the mechanical stresses applied during daily activities while minimizing the risk of wear debris that could lead to inflammatory responses in surrounding tissue.

The properties of polyethylene make it suitable for use in various types of implants, allowing for a favorable interaction with bone and soft tissue. It is also versatile in processing, allowing for different levels of cross-linking to improve its mechanical properties further. This characteristic is essential in ensuring that the implant performs effectively over a long duration within the body.

The other materials listed, while they can have specific uses in certain applications, do not have the same level of acceptance or suitability in orthopedic implants as polyethylene. For instance, PTFE is known for its chemical resistance but lacks the mechanical strength needed for load-bearing applications. Acrylics can be used for certain orthopedic applications, such as bone cements, but they do not offer the same performance as polyethylene in joint replacements. Glass-filled nylon is typically not used in load-bearing implants due to its lower mechanical strength