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Cements, whose main component is polymethyl methacrylate (PMMA), designed to produce a mechanical interlocking effect upon hardening. These cements usually consist of a powder (PMMA, prepolymerized PMMA, or methyl methacrylate co-polymer), a liquid (methylmethacrylate monomer), an initiator, an inhibitor, and a stabilizer that are mixed together. Orthopedic cements are typically applied as runny liquids that set up into a solid hardened material in a time period that can be tailored to the surgeon\'s needs. They are used in orthopedic procedures to anchor metal or plastic prosthetic devices to bone or used alone in the spine to treat osteoporotic compression fractures.
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