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Raman tensor analysis of ultra-high molecular weight polyethylene and its application to study retrieved hip joint components

Paper ID Volume ID Publish Year Pages File Format Full-Text
2153 101 2010 12 PDF Available
Title
Raman tensor analysis of ultra-high molecular weight polyethylene and its application to study retrieved hip joint components
Abstract

The angular dependences of the polarized Raman intensity of Ag, B1g, B2g, and B3g modes have been preliminary investigated on a model fiber sample of ultra-high molecular weight polyethylene (UHMWPE) in order to retrieve the Raman tensor elements, i.e. the intrinsic parameters governing the vibrational behavior of the orthorhombic structure of polyethylene. Based on this Raman analysis, a method is proposed for determining unknown crystallographic orientation patterns in UHMWPE biomedical components concurrently with the orientation distribution functions for orthorhombic lamellae. An application of the method is shown, in which we quantitatively examined the molecular orientation patterns developed on the surface of four in vivo exposed UHMWPE acetabular cups vs. an unused cup. Interesting findings were: (i) a clear bimodal distribution of orientation angles was observed on worn surfaces; and (ii) a definite and systematic increase in both molecular orientation and crystallinity in main wear zones vs. non-wear zones was found in all retrieved acetabular cups. The present crystallographic analysis is an extension of our previous Raman studies of UHMWPE acetabular cups related to assessments of oxidation and residual strain and suggests a viable path to track back wear-history information from the surface of UHMWPE, thus unfolding the in vivo kinematics of the bearing surfaces in hip joints on the microscopic scale.

Keywords
Raman tensor elements; Polarized Raman analysis; UHMWPE; Molecular orientation; Acetabular cups
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Raman tensor analysis of ultra-high molecular weight polyethylene and its application to study retrieved hip joint components
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Publisher
Database: Elsevier - ScienceDirect
Journal: Acta Biomaterialia - Volume 6, Issue 9, September 2010, Pages 3583–3594
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us