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The triple tapered polished cemented stem, C-Stem, introduced in 1993 was based on the original Charnley concept of the "flat back" polished stem.
The Exeter stem is constructed as a loaded, double-tapered, collarless, polished stem, and is designed to subside, in contrast to the Charnley stem [15].
Finite element analysis showed that the stress is higher for the polished (assumed debonded) stem, and therefore we must conclude that either the magnitude of the stress increase is not enough to appreciably increase the damage accumulation rate or, alternatively, the polished stem does not debond immediately from the cement.
A polished stem will most likely cause less abrasion.
Initially, the polished stem lost less bone and subsided more then the other two.
We found that stress relaxation remains high over time in the polished stem.
Similar(29)
Levels of pre-load (shrinkage) damage were the same for both matt and polished stems; furthermore damage for matt vs. polished stems was not significantly different after two million cycles.
We report the results of primary THA performed with cemented polished stems in patients aged 40 years and younger for pathologies other than primary osteoarthritis.
After 1 and 2 years, the polished stems had lost significantly less bone mineral in Gruen zones 1, 2, 6, and 7 (P =.004 to.03); but this difference had disappeared after 5 years.
The polished stems had subsided 0.1 to 0.2 mm more at 6 months and 0.3 to 0.4 mm more at 5 years than the matte and precoated versions (P <.0001) and subsided mainly inside the cement mantle.
Methods Two sizes of double-taper polished stems and matt-processed polished stems (rough stems) were fixed into composite femurs.
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