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We have tested the porosity and fatigue life of five commonly used bone cements: Simplex P, LVC, Zimmer regular, CMW and Palacos R. Tests were conducted with and without centrifugation and with the monomer at room temperature and, except for LVC, at 0#{176}C. We found that the fatigue life ofdifferent specimens varied by a factor ofnearly 100. It did not depend on porosity alone, but was more influenced by the basic composition of the cement. Simplex P when mixed with monomer at 0#{176}C and centrifuged for 60 seconds had the highest fatigue life and was still sufficiently liquid to J. P. Davies, MS. Research and Design Engineer M. Jasty, MD,

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