Highly Crosslinked Polyethylene: A Comparative Study Between Two Uhmwpes With Distinct Molecular Weight

Ferroni, Daniela; Quaglini, Virginio; Dubini, Paolo

doi:10.1142/s0219519410003253

Cited by 1 publication

(2 citation statements)

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“…These changes may fundamentally alter the quality and material properties of the components. In clinical practice this means that one cannot deduce the quality and lifespan of the articular liner based only on its initial mechanical properties [ 12 ]. An orthopaedic surgeon should take into account also the long-term oxidation stability (inversely proportional to FRC).…”

Section: Resultsmentioning

confidence: 99%

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Quantification of structural changes of UHMWPE components in total joint replacements

Fulín

Pokorný

Šlouf

et al. 2014

BMC Musculoskelet Disord

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BackgroundAt present time the number of implantations of joint replacements as well as their revisions increases. Higher demands are required on the quality and longevity of implants. The aim of this work was to determine the degree of oxidative degradation and the amount of free/residual radicals in selected ultra-high molecular weight polyethylene (UHMWPE) components of the joint replacements and demonstrate that the measured values are closely connected with quality and lifetime of the polymer components.MethodsWe tested both new (4 samples) and explanted (4 samples) UHMWPE polymers for total joint replacements. The samples were characterized by infrared spectroscopy (IR), electron spin resonance (ESR) and microhardness (MH) test. The IR measurements yielded the values of oxidation index and trans-vinylene index. The ESR measurements gave the free radicals concentration.ResultsIn the group of new polyethylene components, we found oxidation index values ranging from 0.00-0.03 to 0.24. The trans-vinylene index values ranged from 0.044 to 0.080. The value of free radical concentration was zero in virgin and also in sample of Beznoska Company and non-zero in the other samples. In the group of explanted components, the measured values were associated with their history, micromechanical properties and performance in vivo.ConclusionsWe demonstrated that measuring of oxidative damage may help the orthopaedic surgeon in estimating the quality of UHMWPE replacement component and thus radically to avoid early joint replacement failure due to worse polyethylene quality.

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Section: Resultsmentioning

confidence: 99%

“…The process of polyethylene wear has been explained comprehensibly and in detail in literature [ 12 - 14 ]. In contrast, only a minimum of information is available in orthopaedic literature regarding the principles and mechanisms of oxidative damage .…”

Section: Introductionmentioning

confidence: 99%