Probabilistic assessment of fatigue initiation data on highly crosslinked ultrahigh molecular weight polyethylenes

Pascual, Francisco Javier; Przybilla, Constanze; Gracia, Luis; Puértolas, J.A.; Fernández‐Canteli, Alfonso

doi:10.1016/j.jmbbm.2012.06.004

Cited by 8 publications

(4 citation statements)

References 16 publications

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“…In fact, Sobeiraj and coworkers have presented the only known analysis of notch effects on the fatigue resistance of several modern UHMWPE material formulations using a stress-total life (S-N) approach [24]. However, significant scatter in their results severely limits the statistical interpretation of the data, suggesting that such an S-N approach may not be the best methodology for the notch fatigue evaluation of UHMPWE [24,25].…”

Section: Introductionmentioning

confidence: 99%

Notch fatigue of ultrahigh molecular weight polyethylene (UHMWPE) used in total joint replacements

Ansari

Gludovatz

Kozak

et al. 2016

Journal of the Mechanical Behavior of Biomedical Materials

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Ultrahigh molecular weight polyethylene (UHMWPE) has remained the primary polymer used in hip, knee and shoulder replacements for over 50 years. Recent case studies have demonstrated that catastrophic fatigue fracture of the polymer can severely limit device lifetime and are often associated with stress concentration (notches) integrated into the design. This study evaluates the influence of notch geometry on the fatigue of three formulations of UHMWPE that are in use today. A linear-elastic fracture mechanics approach is adopted to evaluate crack propagation as a function of notch root radius, heat treatment and Vitamin E additions. Specifically, a modified stress-intensity factor that accounts for notch geometry was utilized to model the crack driving force. The degree of notch plasticity for each material/notch combination was further evaluated using finite element methods. Experimental evaluation of crack speed as a function of stress intensity was conducted under cyclic tensile loading, taking crack length and notch plasticity into consideration. Results demonstrated that crack propagation in UHMWPE emanating from a notch was primarily affected by microstructural influences (cross-linking) rather than differences in notch geometry.

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Section: Introductionmentioning

confidence: 99%

Notch fatigue of ultrahigh molecular weight polyethylene (UHMWPE) used in total joint replacements

Ansari

Gludovatz

Kozak

et al. 2016

Journal of the Mechanical Behavior of Biomedical Materials

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“…Whether the impingement started from flexion, extension, or neutral posture inward, the stress generated on the liner exceeded 100 MPa, far beyond the yield stress of the UHMWPE (Pascual et al, 2012). There was no obvious difference in the magnitude of impingement stress generated by different impingement postures.…”

Section: Discussionmentioning

confidence: 87%

“…The fixation claws with high MPS varied when the impingement postures varied (Figure 6A). It is worth mentioning that the stress on the fixation claws did not reach the yield stress (Pascual et al, 2012), so the fixation claws did not enter the plastic deformation stage. The deformation might be the creep deformation caused by long-term stress (Glyn-Jones et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

Cause analysis of the liner dissociation of a customized reverse shoulder prosthesis based on finite element analysis

Wan

Zhang

Bai

et al. 2022

Front. Bioeng. Biotechnol.

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Background: Dissociation of the polyethylene liner after reverse shoulder arthroplasty could cause shoulder dislocation that could not achieve closed reduction. The cause of liner dissociation is currently unclear.Method: Non-homogeneous model of the bone was constructed and dynamic finite element analysis was utilized to simulate the impingement of the polyethylene liner and scapula during humeral adduction. The stress distribution of the fixation claws, their degree of deformation (DOD), and the stress of the impingement sites in three initial humeral postures (neutral, 30° flexion, and 30° extension) were measured and analyzed. The influence of the liner material stiffness was also investigated.Result: The impingement stress on the liner and scapula was 100–200 MPa, and different humeral postures caused different locations of impingement points. The fixation claws’ maximum principal stress (MPS) results were below 5 MPa. In the connection area between some fixation claws and the liner, compressive stresses on the inside and tensile stresses on the outside were observed, which showed that the fixation claws were prone to deform toward the center direction. The maximum DOD results of three initial humeral postures (neutral, 30° flexion, and 30° extension) were 3.6%, 2.8%, and 3.5%, respectively. The maximum DOD results of neutral initial humeral posture were 0.51% and 11.4% when the elastic modulus of the liner was increased and decreased by a factor of 10, respectively.Conclusion: The humeral adduction impingement could lead to the deformation of the claw-shaped liner fixation structure, which might be one of the reasons for the liner dissociation. The increased stiffness of the liner material helped to reduce the deformation of the fixation structure.

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“…ProFatigue is based on the Weibull's regression model proposed by Castillo-Canteli [41] in order to satisfy the physical and statistical conditions required by any valid fatigue model. It has been validated through its successful application to a wide range of materials and practical cases since its launch in 2014, including the fatigue assessment of bio-mechanical materials [42]. Its application in fatigue testing research in the field of dentistry would constitute a significantly improved alternative to those currently proposed in the ISO 14,801 standard (the simplified S-N curve definition and the staircase method), not only because of its accuracy in the fatigue limit estimation itself, but also its ability to provide the probabilistic definition of the whole S-N field of the studied implant or prosthetic component, which would result in much more precise predictions of the lifetime of these components [40].…”

Section: Profatigue Softwarementioning

confidence: 99%

Optimized Planning and Evaluation of Dental Implant Fatigue Testing: A Specific Software Application

García-González

Blasón-González

García

et al. 2020

Biology

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Mechanical complications in implant-supported fixed dental prostheses are often related to implant and prosthetic design. Although the current ISO 14801 provides a framework for the evaluation of dental implant mechanical reliability, strict adherence to it may be difficult to achieve due to the large number of test specimens which it requires as well as the fact that it does not offer any probabilistic reference for determining the endurance limit. In order to address these issues, a new software program called ProFatigue is presented as a potentially powerful tool to optimize fatigue testing of implant-supported prostheses. The present work provides a brief description of some concepts such as load, fatigue and stress-number of cycles to failure curves (S-N curves), before subsequently describing the current regulatory situation. After analyzing the two most recent versions of the ISO recommendation (from 2008 and 2016), some limitations inherent to the experimental methods which they propose are highlighted. Finally, the main advantages and instructions for the correct implementation of the ProFatigue free software are given. This software will contribute to improving the performance of fatigue testing in a more accurate and optimized way, helping researchers to gain a better understanding of the behavior of dental implants in this type of mechanical test.

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Probabilistic assessment of fatigue initiation data on highly crosslinked ultrahigh molecular weight polyethylenes

Cited by 8 publications

References 16 publications

Notch fatigue of ultrahigh molecular weight polyethylene (UHMWPE) used in total joint replacements

Notch fatigue of ultrahigh molecular weight polyethylene (UHMWPE) used in total joint replacements

Cause analysis of the liner dissociation of a customized reverse shoulder prosthesis based on finite element analysis

Optimized Planning and Evaluation of Dental Implant Fatigue Testing: A Specific Software Application

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