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pubmed-article:12149805pubmed:issue6lld:pubmed
pubmed-article:12149805pubmed:dateCreated2002-8-1lld:pubmed
pubmed-article:12149805pubmed:abstractTextThe fixation principle of threaded cups ensures high primary stability. Inadequate results with first-generation threaded cups led to modifications of surface machining. 10 threaded cups of the first generation, and 27 of the second and third generations were systematically analysed and their shapes measured using a no-touch light section technique. In addition, measurements of surface roughness were performed. Implants of the first generation made of polyethylene, ceramic or cobalt-chrome have an average surface roughness (Ra) of 1.5 microns. Approximately one-half of these implants have a conical shape, and one-third a height that is greater than the radius. Threaded cups of the second generation are made either of CP-titanium or titanium alloy. The average corundum-blasted surface roughness is 4.5 microns. Hydroxyapatite-coated (HA) implants have a surface roughness of 5.0 microns. Approximately 45% of the implants have a conical, biconical or flattened-conical shape, while one-third are of hemispherical shape. Approximately 90% of the cups have a height that is up to 23% smaller than the radius. A few cups have a height that approximates the radius. Implants of the third generation with identical surface structure can be supplied with crosslinked-polyethylene inlays or, optionally, with metal/metal or ceramic/ceramic contact surfaces. Primary stability, biocompatible materials and a structured surface are essential for ensuring osseointegration over the long-term. Corundum-blasted pure titanium or titanium alloys with corundum-blasted or HA-coated implants can be considered standard for these cups.lld:pubmed
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pubmed-article:12149805pubmed:statusMEDLINElld:pubmed
pubmed-article:12149805pubmed:monthJunlld:pubmed
pubmed-article:12149805pubmed:issn0013-5585lld:pubmed
pubmed-article:12149805pubmed:authorpubmed-author:RiegerWWlld:pubmed
pubmed-article:12149805pubmed:authorpubmed-author:ImhofMMlld:pubmed
pubmed-article:12149805pubmed:authorpubmed-author:WitzelUUlld:pubmed
pubmed-article:12149805pubmed:authorpubmed-author:KaelinPPlld:pubmed
pubmed-article:12149805pubmed:authorpubmed-author:EffenbergerHHlld:pubmed
pubmed-article:12149805pubmed:issnTypePrintlld:pubmed
pubmed-article:12149805pubmed:volume47lld:pubmed
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pubmed-article:12149805pubmed:authorsCompleteYlld:pubmed
pubmed-article:12149805pubmed:pagination169-75lld:pubmed
pubmed-article:12149805pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:12149805pubmed:year2002lld:pubmed
pubmed-article:12149805pubmed:articleTitle[Modification of form, material and modularity of threaded acetabulum cups].lld:pubmed
pubmed-article:12149805pubmed:affiliationOrthopädische Universitätsklinik, Stiftung Friedrichsheim, Frankfurt a. M. H.Effenberger@telering.atlld:pubmed
pubmed-article:12149805pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:12149805pubmed:publicationTypeComparative Studylld:pubmed
pubmed-article:12149805pubmed:publicationTypeEnglish Abstractlld:pubmed
pubmed-article:12149805pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
pubmed-article:12149805pubmed:publicationTypeEvaluation Studieslld:pubmed