Porous coated prosthesis
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United States of America Patent
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-
Apr 16, 1991
Grant Date -
N/A
app pub date -
May 4, 1990
filing date -
May 4, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An artificial implant includes an elongated stem member which is intended for cementless fixation in the medullary canal of a long bone. The stem member is provided with one or more longitudinally extending channels. A porous medium for enabling and encouraging bone ingrowth fixation is bonded to the bottom surface of each channel but is free of the sidewalls of the channel. It has a first outer surface lying in a plane generally parallel to that of the external surface of the stem member and second and third surfaces lying generally, respectively, in angularly spaced radial planes containing the longitudinal axis of the stem member. The resulting implant has a flexibility which can be tailored to that of the bone. Also, the porous medium enables an initial interference fit with the medullary canal of the long bone as well as bone ingrowth fixation over a substantially enlarged surface area than previously possible. Also, notching the high stress region on the external surface of the stem member as previously caused by application of the porous medium to the outermost, external, surface of the stem member is avoided.
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