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Structural weakening of layered acrylic bone cement.

Occasionally during arthroplasty procedures, additional cement is required to supplement an initial polymerizing mass. In vitro studies demonstrate that this practice significantly weakens the integrity of the added cement, as determined in mechanical shear. This is accompanied by a marked increase in cement porosity, with the voids acting as sites of stress concentration. This caveat has important consequences in clinical use of acrylic bone cement.