Bone cement composition

A bone cement having a dry component and a liquid component, the dry component comprising:

• a polymer bead, the bead having a center and the bead having an exterior surface the polymer composition of the bead being uniform throughout the bead;
• an additive associated with the polymer bead, the additive comprising a plurality of particles contained within a stratum located relative to the center of the bead, the stratum of particles comprising a volume less than the entire bead volume, the stratum being located between the center of the bead and the exterior surface such that a first portion of the bead, which corresponds to the stratum, contains the additive particles and a second portion of the bead lacks the additive particles.

A bone cement having a dry component and a liquid component, the dry component comprising:

• a polymer bead;
• and
• an additive associated with the polymer bead, the additive being located in an inner stratum located relative to the center of the bead wherein the additive is a polymerization initiator and the bead further includes an outer layer which lacks the additive, the outer layer surrounding the inner stratum such that the polymerization initiator is released after the dissolution of the outer layer by the liquid component upon combining the dry component and liquid component.

A bone cement comprising a dry component and a liquid component, the dry component including relatively larger polymer beads and relatively smaller polymer beads, the composition of the relatively smaller polymer beads being different from the composition of the relatively larger polymer beads, the relatively smaller polymer beads dissolving in the liquid component before the relatively larger polymer beads dissolve in the liquid component when the dry and liquid components are mixed.