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KMID : 0386719940060010051
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Journal of the Korean Hip Society
1994 Volume.6 No. 1 p.51 ~ p.60
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Loss of Hydroxyapatite Coating on Retrieved Femoral Components
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김영호
김선재/권재욱/나수균/최창욱
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Abstract
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Authors experienced 3 cases of retrieved HA coated implants, which were removed for vertical subsidence due to intraoperative proximal femoral fracture in 2 cases and postoperative proxmal femoral fracture with spiral oblique pattern after
slip
down of patient in 1 case. The removed femoral components revealed significant loss of HA around the surface of them. We investigated average amount of HA lost, average exten of bone contact in microscopy and average thickness of HA
present
to identify the role and fate of HA in vivo of human and find out ways for adequate use of HA. Our suggestons are as follwings;
1) Even if HA ccat was used for promoting bony apposition on implant surface, it didnot work in extremely unstable mechanical condition. Therefore, tight press-fit of femoral implant into the medullary canal is very important to get promoted
bony
apposition on implant even in the caes of HA coated implant.
2) As most of HA coationg had been resored eventually during the short period of implantatio, implants with porous surface or rough surface may be preferable to use for bony anchorage to the surgace of implants rather than use of
implants
with
smooth surface.
3) As HA coating was resorbed during resorbed during resorbed during relatively short period and replaced by bone, it may be resonable to use thinner coat such as 70um thickness or less rather than to use thicker coat.
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