Life Estimation of Knee Joint Prosthesis by Combined Effect of Fatigue and Wear

Rawal, B.R.; Yadav, Amit; Pare, Vinod

doi:10.1016/j.protcy.2016.03.072

Cited by 41 publications

(23 citation statements)

References 25 publications

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“…[11,25] An average of about 0.9 million cycles per year was calculated for each joint in the lower extremity; this number is close to the average of 1.0 million cycles per year for elderly individuals who do not have a joint prosthesis [11,25,30] However, for younger and more active patients, this number goes up to 3.2 million cycles per year. [11,25] An average of about 0.9 million cycles per year was calculated for each joint in the lower extremity; this number is close to the average of 1.0 million cycles per year for elderly individuals who do not have a joint prosthesis [11,25,30] However, for younger and more active patients, this number goes up to 3.2 million cycles per year.…”

Section: Tribological Studymentioning

confidence: 74%

“…UHMWPE-MWCNT samples exhibited a granular surface with carbon nanotubes-rich zone grains, consistent with a network seen after the solution blending of the material (Figure 4b). [22,23,25,26] However, most of the scratches found on the sample surfaces were located near the edge. Surface roughness has been shown to influence the wear behavior of polymeric components used in orthopedic implants, specifically in artificial knees.…”

Section: Surface Analysismentioning

confidence: 99%

“…Elastohydrodynamic lubrication as well as friction and surface deformation severity will depend on the conditions and properties of the material when wear is occurring at a bearing surface. [22,23,25,26] However, most of the scratches found on the sample surfaces were located near the edge.…”

Section: Surface Analysismentioning

confidence: 99%

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Wear performance of multiwalled carbon nanotube‐reinforced ultra‐high molecular weight polyethylene composite

2017

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Ultra-high molecular weight polyethylene (UHMWPE) has proven to be a good counterpart articulating surface against Cr-Co-Mo femoral components in artificial joints. Nevertheless, UHMWPE wear damage and subsequent aseptic loosening continues to be the main reason for revision of knee replacements. There is an ongoing research effort to improve the metal-on-UHMWPE couple. This study compares the wear resistance of multiwalled carbon nanotube-reinforced UHMWPE composite with conventional orthopedic grade UHMWPE currently used in total knee replacements. Defined by previous studies, 1.25 wt.% multiwall carbon nanotubes (MWCNT) were incorporated into UHMWPE to fabricate UHMWPE-MWCNT composites by solution blending, achieving an even distribution in the polymeric matrix. UHMWPE-MWCNT samples were manufactured by compression molding and sterilized with γ-rays. Scanning electron microscopy confirmed a uniform distribution of the MWCNTs. The volumetric wear was reduced by 86.9%, and the indentation depth in creep testing decreased 68%. The composite displayed superior wear behavior producing less wear debris than conventional materials. K E Y W O R D Scomposites, mechanical properties, multiwall carbon nanotubes, ultra-high molecular weight polyethylene, wear debris

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Section: Tribological Studymentioning

confidence: 74%

Section: Surface Analysismentioning

confidence: 99%

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Wear performance of multiwalled carbon nanotube‐reinforced ultra‐high molecular weight polyethylene composite

2017

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“…Ennek a ténye-zőnek a nagyságát általában 0 és 40% között alkalmazzák pin-on-disc, ball-on-disc vagy térdszimulátoron végzett tribológiai tesztek során. [7][8][9][10] Ciklikus tesztek alatt ennek a té-nyezőnek a nagyságát mindig állandónak tekintik McGloughlin és Kavanagh, 11 valamint Hollman és m.társai 12 tanulmányai alapján. McGloughlin és Kavanagh 11 kutatásai alapján az állandó csúszva-gördülési tényező használata abban az esetben ajánlott, ha egyszerű geometriájú felületek közötti kapcsolatot tekintünk, mint például a pin-on-disc és ballon-disc típusú tesztek.…”

Section: Bevezetésunclassified

Mechanical model for estimating wear in tibio-femoral connection in total knee replacements

Fekete¹,

Bíró²,

Csizmadia³

2017

biomech hung

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AbsztraktA kopás olyan mechanikai faktor, amely az térdízületi implantátumok élettartamát legjelentő-sebben befolyásolja. Implantátumok esetében a kopás vizsgálatához különböző berendezésekkel (pin-on-disc, térd szimulátor) kísérleteket végeznek, amely kísérletekben több paraméter mellett, állandó csúszva-gördülési tényezőt alkalmaznak. Az utóbbi években megjelent cikkek alapján, több szerző cáfolja azt az állítást, hogy az állandó csúszva-gördülési tényező megfelelő lenne a modellezésnél. Ez a térdízület kapcsolódó geometriájának bonyolultságával indokolható, ami miatt a lokális kinematika is túl komplexé válik az ilyen egyszerű feltétel alkalmazhatóságához. Ebben a tanulmányban, a csúszva-gördülés változásának hatását kívánjuk bemutatni egy jól ismert mechanikai kopás modellen, az ún. Archard modellen. A modell által kimutathatóvá válik, hogy a kopás a korábbi eredményekkel ellentétben, 10% túlbecsült a 0 és 60 behajlítási fok közé eső tartományban, járás során, míg 65% alulbecsült a 0-120 behajlítási fok közé eső tartományban, guggolás során. Kulcsszavak: kopás, térd, járás, guggolás, Archard modell, csúszva-gördülés Mechanical model for estimating wear in tibio-femoral connection in total knee replacements AbstractWear is considered the main mechanical factor that limits the lifetime duration of total knee replacements (TKRs). Among several parameters during wear experiments, constant slide-roll ratio (S/R ratio) is frequently applied during pin-on-disc tests and knee simulators. However, several papers showed that the idea of constant S/R ratio is not a proper approach if TKR wear is modelled due to the complex geometry. In this study, the significant effect of S/R on wear is demonstrated by involving a flexion angle dependent S/R ratio into Archard's law during gait and squat motion. By including this new parameter, it is demonstrated that the earlier models with constant S/R ratio overestimated wear by approximately 10% from 0 to 60 degree of flexion angle during gait, while underestimated it by approximately 65% from 0 to 120 degree of flexion angle during squat.

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“…It is also highly influenced by the kinematics of the knee joint6. Besides the two most important parameters in wear studies, the load and the length of sliding, slide-roll ratio is also frequently taken into account when tribological tests are carried out on pin-on-disc test rigs or knee simulators 7,8 . During wear tests, in most cases, a constant load is applied together with a constant slide-roll ratio based on the study of McGloughlin and Kavanagh 9 and Hollman et al 10 .…”

Section: Introductionmentioning

confidence: 99%

Tibiofemoral wear in standard and non-standard squat: implication for total knee arthroplasty

Fekete

Sun

et al. 2019

Muscle Ligaments and Tendons J

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Introduction: Due to the more resilient biomaterials, problems related to wear in total knee replacements (TKRs) have decreased but not disappeared. In the design-related factors, wear is still the second most important mechanical factor that limits the lifetime of TKRs and it is also highly influenced by the local kinematics of the knee. During wear experiments, constant load and slide-roll ratio is frequently applied in tribo-tests beside other important parameters. Nevertheless, numerous studies demonstrated that constant slide-roll ratio is not accurate approach if TKR wear is modelled, while instead of a constant load, a flexion-angle dependent tibiofemoral force should be involved into the wear model to obtain realistic results. Methods: A new analytical wear model, based upon Archard's law, is introduced, which can determine the effect of the tibiofemoral force and the varying slide-roll on wear between the tibiofe-moral connection under standard and non-standard squat movement. Results: The calculated total wear with constant slide-roll during standard squat was 5.5 times higher compared to the reference value, while if total wear includes varying slide-roll during standard squat, the calculated wear was approximately 6.25 times higher. With regard to non-standard squat, total wear with constant slide-roll during standard squat was 4.16 times higher than the reference value. If total wear included varying slide-roll, the calculated wear was approximately 4.75 times higher. Conclusions: It was demonstrated that the augmented force parameter solely caused 65% higher wear volume while the slide-roll ratio itself increased wear volume by 15% higher compared to the reference value. These results state that the force component has the major effect on wear propagation while non-standard squat should be proposed for TKR patients as rehabilitation exercise.

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Life Estimation of Knee Joint Prosthesis by Combined Effect of Fatigue and Wear

Cited by 41 publications

References 25 publications

Wear performance of multiwalled carbon nanotube‐reinforced ultra‐high molecular weight polyethylene composite

Wear performance of multiwalled carbon nanotube‐reinforced ultra‐high molecular weight polyethylene composite

Mechanical model for estimating wear in tibio-femoral connection in total knee replacements

Tibiofemoral wear in standard and non-standard squat: implication for total knee arthroplasty

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