By Steven M. Kurtz, Ray A. Gsell, and John Martell, editors
Seventeen peer-reviewed papers characteristic the newest examine on ultra-high molecular weight polyethylene (UHMWPE) as used for joint replacements. issues disguise: Quantifying scientific reaction; momentary Retrievals; security of Crosslinked PE in Knees; Mechanical homes; and In-Vitro trying out.
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Extra resources for Crosslinked and Thermally Treated Ultra-High Molecular Weight Polyethylene for Joint Replacements (ASTM Special Technical Publication, 1445)
170-180. , "Impact of Sterilization on Clinical Performance of Polyethylene in the Hip," Clinical Orthopaedics, Vol. 319, 1995, pp. 28-40. Steven M. Kurtz, 1,2Joseph Turner, 2 Michael Herr, l Avram A. Edidin, 2 and Clare M. Rimnac 3 Assessment of Surface Roughness and Waviness Using White Light Interferometry for Short-Term Implanted, Highly Crosslinked Acetabular Components REFERENCE: Kurtz, S. , Edidin, A. , and Rimnac, C. , "Assessment of Surface Roughness and Waviness using White Light Interferometry for Short-Term Implanted, Highly Crosslinked Aeetabular Components," Crosslinked and Thermally Treated Ultra-High Molecular Weight Polyethylene for Joint Replacements, ASTM STP 1445, S.
This phenomenon appears primarily in the worn regions of the cup. The oxidation levels of the bearings were low (Table 1 ), most an order of magnitude less than the ketone oxidation measured in a never-implanted, gamma radiation in air sterilized bearing with a shelf life o f 2 months. The five bearings that were melt annealed after radiation cross-linking and sterilized by non-gamma techniques showed minimal oxidation with a maximum at the surface. The one bearing that was annealed below the melt point and gamma radiation sterilized demonstrated a subsurface oxidation peak similar to other gamma radiation in air sterilized, retrieved bearings.
Wear measurement studies based on radiographic techniques provide quantification of femoral head penetration into the acetabular liner. Radiographic wear assessments are also useful to quantify the time course during which femoral head penetration (assumed to be the wear rate) takes place during implantation; thus, hypotheses related to an accelerating (or decelerating) wear rate can be investigated. However, radiographic wear methods provide little information regarding the m e c h a n i s m s of in vivo wear of orthopedic bearing materials.
Crosslinked and Thermally Treated Ultra-High Molecular Weight Polyethylene for Joint Replacements (ASTM Special Technical Publication, 1445) by Steven M. Kurtz, Ray A. Gsell, and John Martell, editors