Method for cementing an implant into bone
AssigneeAO-Forschungsinstitut Davos
InventorSlobodan Tepic
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Abstract
In this method for cementing an implant into bone by means of an autopolymerising two-component bone cement the implant, in particular the stem of a hip prosthesis is preheated above room-temperature prior to its cementing into bone, preferably to at least 43.degree. C. By this method the stem-cement interface is warmer than the bone-cement interface and consequently a stiff cement shell will form first around the stem and the cement will shrink towards the stem and away from the bone. The resulting reduction of porosity at the stem-cement interface improves significantly the fatigue life of the system.
Claims17
A method for cementing an implant into bone by placing an autopolymerising cement on or in the bone to be treated and placing the implant in contact with said cement so that a layer of said cement remains between the implant surface and the bone, said cement comprising at least a monomer and a polymerization initiator, wherein polymerization of said cement is caused to start first at the implant/cement interface and wherein the surface of said implant is caused to be hotter that the surface of said bone at the onset of polymerization.
A method for cementing an implant into bone by placing an autopolymerising cement on or in the bone to be treated and placing the implant in contact with said cement so that a layer of said cement remains between the implant surface and the bone, said cement comprising at least a monomer and a polymerization initiator, wherein polymerization of said cement is caused to start first at the implant/cement interface and wherein a layer of said initiator is applied to the surface of the implant prior to polymerization.
Dependencies are inferred from the claim text.