Towards the understanding of lubrication mechanisms in total knee replacements – Part II: Numerical modeling

Marian, Max; Orgeldinger, Christian; Rothammer, Benedict; Nečas, David; Vrbka, Martin; Křupka, Ivan; Hartl, Martin; Wimmer, Markus A.; Tremmel, Stephan; Wartzack, Sandro

doi:10.1016/j.triboint.2020.106809

Cited by 30 publications

(42 citation statements)

References 54 publications

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“…The contact and lubrication conditions in the studied pin-on-disk model tests generally featured similarities to those observed in some steps of a transient load collective from the ISO 14243 [ 47 , 49 ] gait cycle, see Marian et al [ 67 , 68 ]. In particular, the contact dimensions and deformations of the rubbing surfaces observed here matched well instants with low fluid film heights near the reversal points of motion/velocities.…”

Section: Discussionmentioning

confidence: 52%

“…Here, a numerical 3D EHL model based upon the full-system FEM approach [ 82 , 83 ] was employed and adapted to fit for the initial conditions of the present experimental configuration. Numerical modeling was already presented in great detail and validated for TKAs in [ 67 , 68 ]. Therefore, only the most important features and differences to the previously published work are described in the following.…”

Section: Methodsmentioning

confidence: 99%

“…The studies from Su et al [ 64 , 65 ] based upon a coupled solution of the hydrodynamics and the elastic deformation by a multigrid finite difference and constraint column model or Gao et al [ 66 ] using a multigrid and spherical fast Fourier transformation-based approach may be mentioned as examples. Lately, Marian et al [ 67 ] introduced an approach based upon full-system FEM combined with comparisons with experimental measurements from a knee simulator using optical fluorescence microscopy [ 68 ]. Thus, in principle, some numerical approaches are available.…”

Section: Introductionmentioning

confidence: 99%

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Amorphous Carbon Coatings for Total Knee Replacements—Part II: Tribological Behavior

et al. 2021

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Diamond-like carbon coatings may decrease implant wear, therefore, they are helping to reduce aseptic loosening and increase service life of total knee arthroplasties (TKAs). This two-part study addresses the development of such coatings for ultrahigh molecular weight polyethylene (UHMWPE) tibial inlays as well as cobalt-chromium-molybdenum (CoCr) and titanium (Ti64) alloy femoral components. While the deposition of a pure (a-C:H) and tungsten-doped hydrogen-containing amorphous carbon coating (a-C:H:W) as well as the detailed characterization of mechanical and adhesion properties were the subject of Part I, the tribological behavior is studied in Part II. Pin-on-disk tests are performed under artificial synovial fluid lubrication. Numerical elastohydrodynamic lubrication modeling is used to show the representability of contact conditions for TKAs and to assess the influence of coatings on lubrication conditions. The wear behavior is characterized by means of light and laser scanning microscopy, Raman spectroscopy, scanning electron microscopy and particle analyses. Although the coating leads to an increase in friction due to the considerably higher roughness, especially the UHMWPE wear is significantly reduced up to a factor of 49% (CoCr) and 77% (Ti64). Thereby, the coating shows continuous wear and no sudden failure or spallation of larger wear particles. This demonstrated the great potential of amorphous carbon coatings for knee replacements.

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Section: Discussionmentioning

confidence: 52%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Amorphous Carbon Coatings for Total Knee Replacements—Part II: Tribological Behavior

et al. 2021

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“…When comparing the Hertzian pressures for the pairings between Ti64, CoCr as well as UHMWPE and the Rockwell diamond (p H,Ti64,Lc1 = 6715 MPa, p H,CoCr,Lc1 = 9553 MPa and p H,UHMWPE,Lc1 = 213 MPa), it becomes evident that this fairly exceeded the tensile strength of cortical bone as well as the tensile strength of the substrates [131]. Likewise, this clearly surpasses the pressures to be expected in TKAs [81,132]. Overall, the adhesion of the investigated coatings to all substrates can therefore be considered as sufficient for the biotribological requirements in knee endoprostheses.…”

Section: Adhesionmentioning

confidence: 94%

Amorphous Carbon Coatings for Total Knee Replacements—Part I: Deposition, Cytocompatibility, Chemical and Mechanical Properties

et al. 2021

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Diamond-like carbon (DLC) coatings have the potential to reduce implant wear and thus to contribute to avoiding premature failure and increase service life of total knee replacements (TKAs). This two-part study addresses the development of such coatings for ultrahigh molecular weight polyethylene (UHMWPE) tibial inlays as well as cobalt–chromium–molybdenum (CoCr) and titanium (Ti64) alloy femoral components. While a detailed characterization of the tribological behavior is the subject of part II, part I focusses on the deposition of pure (a‑C:H) and tungsten-doped hydrogen-containing amorphous carbon coatings (a‑C:H:W) and the detailed characterization of their chemical, cytological, mechanical and adhesion behavior. The coatings are fabricated by physical vapor deposition (PVD) and display typical DLC morphology and composition, as verified by focused ion beam scanning electron microscopy and Raman spectroscopy. Their roughness is higher than that of the plain substrates. Initial screening with contact angle and surface tension as well as in vitro testing by indirect and direct application indicate favorable cytocompatibility. The DLC coatings feature excellent mechanical properties with a substantial enhancement of indentation hardness and elastic modulus ratios. The adhesion of the coatings as determined in modified scratch tests can be considered as sufficient for the use in TKAs.

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“…As future research directions, the proposed model can be extended to account for the dynamics of the patella-femoral joint in addition to the tibiofemoral joint as well as to take fluid lubrication into account while handling fluid-structure interaction [105][106][107]. Moreover, the suggested approach can be utilized to optimize the design and material properties of TKAs to improve their lifetime and tribology performance, using optimization approaches such as genetic algorithm (GA) and particle swarm optimization (PSO) algorithms [108].…”

Section: Conclusion and Future Research Directionsmentioning

confidence: 99%

On the Effect of Friction on Tibiofemoral Joint Kinematics

Askari

Andersen

2021

Applied Sciences

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The effect of friction on nonlinear dynamics and vibration of total knee arthroplasties is yet to be investigated and understood. This research work aims at studying the influence of friction on nonlinear dynamics, friction-induced vibration, and damage of tibiofemoral joints. For this purpose, a spatial dynamic knee model is developed using an asymmetric nonlinear elastic model accounting for knee joint ligaments and a penalty contact model to compute normal contact stresses in the joint while contact detection is treated such that the associated computational time is reduced. Several friction models are considered and embedded in the dynamic model to estimate tangential friction forces in the knee joint. External loads and moments, due to the presence of all soft tissues, e.g., muscles and hip-joint reaction forces, applied to the femoral bone are determined using a musculoskeletal approach. In the post-processing stage, damage, i.e., wear and creep, are estimated using three wear models and an empirical creep formulation, respectively. In addition, a FFT analysis is performed to evaluate likely friction-induced vibration of tibiofemoral joints. Mesh density analysis is performed and the methodology is assessed against outcomes available in the literature. It can be concluded that friction influences not only the tribology, but also dynamics of the knee joint, and friction-induced vibration is likely to take place when the friction coefficient increases.

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Towards the understanding of lubrication mechanisms in total knee replacements – Part II: Numerical modeling

Cited by 30 publications

References 54 publications

Amorphous Carbon Coatings for Total Knee Replacements—Part II: Tribological Behavior

Amorphous Carbon Coatings for Total Knee Replacements—Part II: Tribological Behavior

Amorphous Carbon Coatings for Total Knee Replacements—Part I: Deposition, Cytocompatibility, Chemical and Mechanical Properties

On the Effect of Friction on Tibiofemoral Joint Kinematics

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