In thepresentstudy,numericalandexperimentalwearinvestigationsonreversetotal shoulder arthroplasties(RTSAs)werecombinedinordertoestimatespecific wear coefficients, currentlynotavailableintheliterature.Awearmodelpreviouslydeveloped by theauthorsformetal-on-plastichipimplantswasadaptedtoRTSAsandappliedina double direction: firstly, toevaluatespecific wearcoefficients forRTSAsfromexperimental results andsecondly,topredictweardistribution.Inbothcases,theArchardwearlaw(AR) and thewearlawofUHMWPE(PE)wereconsidered,assumingfourdifferent k functions. The resultsindicatedthatboththewearlawspredicthigherwearcoefficients forRTSA with respecttohipimplants,particularlytheARlaw,with k values higherthantwofoldthe hip ones.Suchdifferencescansignificantly affectpredictivewearmodelresultsforRTSA, when non-specific wearcoefficients areused.Moreover,thewearmapssimulatedwiththe two lawsaremarkedlydifferent,althoughprovidingthesamewearvolume.Ahigherwear depth (þ51%) isobtainedwiththeARlaw,locatedatthedomeofthecup,whilewiththePE law themostwornregionisclosetotheedge.Takingadvantageofthelineartrendof experimental volumelosses,thewearcoefficientsobtainedwiththeARlawshouldbe valid despitehavingneglectedthegeometryupdateinthemodel.

Numerical and experimental investigations for the evaluation of the wear coefficient of reverse total shoulder prostheses

MATTEI, LORENZA;DI PUCCIO, FRANCESCA;CIULLI, ENRICO
2016

Abstract

In thepresentstudy,numericalandexperimentalwearinvestigationsonreversetotal shoulder arthroplasties(RTSAs)werecombinedinordertoestimatespecific wear coefficients, currentlynotavailableintheliterature.Awearmodelpreviouslydeveloped by theauthorsformetal-on-plastichipimplantswasadaptedtoRTSAsandappliedina double direction: firstly, toevaluatespecific wearcoefficients forRTSAsfromexperimental results andsecondly,topredictweardistribution.Inbothcases,theArchardwearlaw(AR) and thewearlawofUHMWPE(PE)wereconsidered,assumingfourdifferent k functions. The resultsindicatedthatboththewearlawspredicthigherwearcoefficients forRTSA with respecttohipimplants,particularlytheARlaw,with k values higherthantwofoldthe hip ones.Suchdifferencescansignificantly affectpredictivewearmodelresultsforRTSA, when non-specific wearcoefficients areused.Moreover,thewearmapssimulatedwiththe two lawsaremarkedlydifferent,althoughprovidingthesamewearvolume.Ahigherwear depth (þ51%) isobtainedwiththeARlaw,locatedatthedomeofthecup,whilewiththePE law themostwornregionisclosetotheedge.Takingadvantageofthelineartrendof experimental volumelosses,thewearcoefficientsobtainedwiththeARlawshouldbe valid despitehavingneglectedthegeometryupdateinthemodel.
Mattei, Lorenza; DI PUCCIO, Francesca; Joyce, Thomas J.; Ciulli, Enrico
File in questo prodotto:
File Dimensione Formato  
Accepted manuscript - Online.pdf

accesso aperto

Tipologia: Documento in Post-print
Licenza: Creative commons
Dimensione 2.34 MB
Formato Adobe PDF
2.34 MB Adobe PDF Visualizza/Apri
accepted manuscript.pdf

accesso aperto

Tipologia: Documento in Post-print
Licenza: Creative commons
Dimensione 2.91 MB
Formato Adobe PDF
2.91 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/765224
Citazioni
  • ???jsp.display-item.citation.pmc??? 0
  • Scopus 12
  • ???jsp.display-item.citation.isi??? 8
social impact