ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Medial placement of a cementless acetabular component into or beyond the medial wall ofa shallow, dysplastic acetabulum is a technique to enhance its coverage during difficult total hiparthroplasty (THA). Dysplastic hips almost always need small size of acetabular component, so anaccelerated polyethylene wear can occur when a conventional bearing surface is used. Modernalumina-on-alumina couplings can be an alternative for these patients. We evaluated the clinicalresults of 43 medially placed cementless acetabular components (PLASMACUP®SC) incorporating amodern alumina bearing surface (BIOLOX® forte). Acetabular components were inserted mediallybeyond the ilioischial line and, therefore, beyond the level of the cortical bone of the cotyloid notch,and followed up for more than 5 years (range, 60 – 93 months). In 14 hips, the medial acetabular wallwas perforated purposefully and the medial aspect of the cup was placed beyond both the ilioischialand the iliopubic line on radiographs. The mean Harris hip score improved from 55.3 pointspreoperatively to 94.5 points postoperatively. Postoperatively, the hip center migrated 12.1 mmmedially and 1.5 mm inferiorly. The average amount of cup protrusion beyond the ilioischial and theiliopubic line was 3.1 mm and 1.9 mm, respectively. The average superolateral coverage of the cupwas 98.5 percent. During follow-up, no osteolysis or loosening of acetabular components wasobserved and no revision was required. Medial placement of a cementless acetabular component intoor beyond the medial acetabular wall offers predictable clinical results and durable fixation in modernalumina-on-alumina THA
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.1243.pdf
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