Knochenzements

Knochenzement, also known as bone cement, is a biocompatible material used in orthopedic surgery. Its primary function is to fix implants, such as joint replacements, to bone. It is typically a polymethylmethacrylate (PMMA) based substance, which is a type of acrylic plastic. The cement is supplied in two components: a powder and a liquid. These are mixed together by the surgeon at the time of use, initiating a chemical reaction that causes the cement to harden. This hardening process generates heat, which is a characteristic feature of bone cement. The setting time can be controlled by the manufacturer and adjusted by the surgeon through mixing techniques.

Once mixed, the cement is malleable and can be injected or molded into place around the implant and bone. As it cures, it creates a strong bond, effectively anchoring the prosthesis. This method of fixation is known as cemented arthroplasty. While effective, the presence of bone cement can sometimes lead to long-term issues such as aseptic loosening, where the cement-bone interface deteriorates, or cement fragmentation. Uncemented (press-fit) implants are an alternative that rely on the natural bone ingrowth for fixation. Knochenzement is an indispensable tool in many joint replacement procedures, offering a reliable method for implant fixation.