Bone prosthesis with porous coating
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United States of America Patent
Stats
-
Aug 15, 1995
Issued Date -
N/A
app pub date -
Dec 4, 1992
filing date -
Feb 18, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved metallic bone prosthesis having a porous coating for bone ingrowth or interlocking with bone cement is disclosed. The porous coating comprises two layers of generally ball-shaped metallic particles bonded together at their points of contact, e.g. by sintering, and defining between them a plurality of connected interstitial pores having an average pore size of from about 350 microns to about 500 microns. A high resistance to failure at the coating-substrate and bone-coating (or cement-coating) interfaces is achieved with the use of the improved prosthesis. Also disclosed are a novel method for affixing the porous coating to a metal substrate, and a knee joint prosthesis having bearing portions designed so that the function of said prosthesis closely approximates that of the natural knee.
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