Abstract
Polymethylmethacrylate (PMMA) bone cement has been used to fix implants into bones in humans for more than 30 years. It is, perhaps, the least well understood of the implant components — it has been blamed for early failure, it has been called the “weak link” in the replacement joint system, etc. In order for bone cement to be used successfully in long-term fixation of a total replacement hip joint, the femoral and acetabular components must be designed to take account of the properties of the bone cement and the surgeon must use a surgical (cementing) technique that ensures good quality cement and good quality interfaces between cement and stem or cup, and cement and bone. This chapter will consider the properties of PMMA bone cement and discuss how these properties interact with the shape and surface finish of a total hip femoral stem to alter the way in which load is transmitted across the cement-stem and cement-bone interfaces.
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