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KMID : 0386719960080020179
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Journal of the Korean Hip Society
1996 Volume.8 No. 2 p.179 ~ p.185
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Seating of Hemispherical vs Dual-radius Components in press-fit cementless Acetabular
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김용식
우영균/권순용/김기원/이화성/이성재/박수안
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Abstract
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Thirty-eight paired, size-matched, fresh-frozen cadaver acetabular were used to study reamed surface topography and the seating of on-line versus oversized noncemented components. Four commonly used constructs were considered: on-line reamed and
20mm
oversized hemispherical cups, and on-line reamed and 1-mm oversized dual-radius cups. Reamed surface topography was indexed by three-dimensional surfaces mathematically fitted to digitized catings. component seating was indexed by the
distribution
of
bone-cup contact and the thickness of the gap between the componnent backing and the bone. The reamed surfaces were better approximately by slightly blunt ellipsoids than by spheres, especially for the smaller acetabulae. Seating of the on-line
hemispherical cups was best near the pole and poorest near the equator, whereas the converse was true for the 1-mm oversized dual-radius cups. The on-line dual-radius cups offered better overall compromise between polar and equatorial contact
than
did
the 2-mm oversized hemispherical components.
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KEYWORD
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