Orthopedics
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Review Comparative Study
Surface replacement solutions for the arthritic hip.
Surface replacement is a conservative treatment for young, active patients with hip osteoarthritis. It provides an increased range of motion as the result of a larger diameter head and improved wear characteristics because of the metal-on-metal articulation as well as an extremely low dislocation rate and increased patient function. While early results are encouraging, long-term outcomes are necessary to define and delineate the role of surface replacement arthroplasty in the treatment of significant hip arthritis.
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Many factors affect the rate of polymerization of polymethylmethacrylate (PMMA) and, therefore, the working time of bone cement. Surgeons may control some factors, but not all. ⋯ However, a surgeon has no control over the industrial mixture of the components of the bone cement, which can vary considerably from batch to batch. This article reviews the effect of temperature of cement mixtures on the working time of the cement, the interfacial strength of the cement-metal interface as well as the cement-bone interface, and tissue viability and cellular change at the bone-cement interface.