The modulus of elasticity and flexural strength were measured for three bone cements, CMW Bone Cement, Surgical Simplex, and Palacos R. with various additions and prepared as in actual use. A distinct afterpolymerization was demonstrated in all three brands. The addition of blood lowered the E-modulus wheras radio-opaque media seemed to render them somewhat stiffer. The rupture values demonstrated the inhomogeneity of the final product in all three brands. The possible clinical significance of the findings is discussed.
The stress pattern of the 0 s coxae was evaluated from the trabecular patterns and the theoretically predicted stresses based on the principles of Wolffs law. A good correlation between the expected stress situation and the trabecular pattern was observed.
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