WAVE PROPAGATION IN PMMA-CANCELLOUS BONE COMPOSITES.

Abstract

Twenty-four composite specimens were manufactured by coring out cylindrical pieces of cancellous bone using a diamond coring drill bit and a drill press. Specimens were obtained from bovine femoral and tibial bone kept frozen until ready for use. Special attention was paid to the orientation of the trabeculae so that the length of the cylindrical specimens coincided with the major direction of trabecular orientation. PMMA-cancellous bone composites were made by injecting low viscosity bone cement into the cylindrical samples of bone. Each specimen was placed inside plastic tubing to constrain the lateral flow of cement. Ultrasonic velocity measurements were done using a pulse-transit time technique. By measuring the time delay between the start of the transmitted pulse and the received signal and dividing this time delay by the length of the specimen the sonic velocity was obtained. This velocity corresponds to the bulk velocity rather than the bar velocity as was ascertained after similar tests were conducted on commercial plexiglass samples of various diameters. Study materials, methods and results are discussed.

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