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  • (PDF) Wear versus Thickness and Other Features of 5-Mrad

    Wear versus Thickness and Other Features of 5-Mrad Crosslinked UHMWPE Acetabular Liners. Clinical Orthopaedics and Related Research® 2011. Harry McKellop. Assessment of acetabular cup wear with computed tomography and influence of surface roughness on wear of materials for hip prostheses.

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  • Wear resistance of UHMWPE-based carbon

    In this paper wear resistance of UHMWPE composites was studied using block-on-ring test under dry sliding friction. The effects of adding carbon nano-fiber (CNF) 0.5wt and treatment by aluminum boron (AlB x) ion implantation onto wear resistance are reported. The main purpose was to find the rational dose and study the influence of ion dose

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  • Research on the Abrasion Resistance of Acetabulum

    The wear-resisting function of the 4-10mm thickness Ultra high molecular weight polyethylene artificially acetabulum was researched which matches up with the 28mm-diameter artificial thigh . The Elastic deformation theory and the finite-element analysis to get the regularity of distribution on contract stress were compared calculate the stress integral to friction journey during the

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  • The influence of head diameter and wall thickness on

    Goebel et al. 21 studied the influence of head size and wall thickness on the deformation of the shell and the UHMWPE liner with a numerical method. However the effect of the deformation of a

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  • Study on the Properties of UHMW-PE Film

     · 2.3. Wear Testing Setting the cylinder number 1000r 1500r 2000r 2500r 3000r the UHMW-PE films were rubbed at 25˚C. The changes of mass and contact angle of UHMW-PE films were investigated. 2.4. Characterization Thickness was tested by a Thickness tester (Lab think Instruments CO. Ltd. CHY-CA). Thermal degradation

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  • Comparison of Conventional Polyethylene Wear and Signs

    Multiple factors have been identified as contributing to polyethylene wear and debris generation of the acetabular lining. Polyethylene wear is the primary limiting factor in the functional behavior and consequent longevity of a total hip arthroplasty (THA). This retrospective study reviewed the clinical and radiographic data of 77 consecutive THAs comparing in vivo polyethylene wear of two

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  • Study on the Properties of UHMW-PE Film

     · Some physicochemical properties of UHMW-PE film such as gas permeability tensile strength and corrosion resistance in acid with different immersion time various concentrations and various solutions and rattler testing were studied. The obtained results showed that the values of gas permeability tensile strength elongation at break and the temperature of dissociation at weight loss

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  • Comparison of Conventional Polyethylene Wear and Signs

    Multiple factors have been identified as contributing to polyethylene wear and debris generation of the acetabular lining. Polyethylene wear is the primary limiting factor in the functional behavior and consequent longevity of a total hip arthroplasty (THA). This retrospective study reviewed the clinical and radiographic data of 77 consecutive THAs comparing in vivo polyethylene wear of two

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  • The Effect of the Wall Thickness on Wear of an UHMWPE

    A larger diameter of femoral head of artificial hip joint (AHJ) is commonly recommended for increasing range of motion (RoM) and for avoiding dislocation. Unfortunately increasing that diameter will reduce the material liner thickness of the acetabular component. The behaviour of the AHJ contact system with thickness variation of the Ultra High Molecular Weight Polyethylene (UHMWPE

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  • UHMWPE Scientific

    Abstract In order to study the effect of UHMWPE fiber laminate on effective protection area of ceramic composite target a dynamic analysis software ANSYS/LS-DYNA was used to calculate the effective protection area of ceramic/aluminum/aluminum composite target and ceramic/UHMWPE/aluminum/ aluminum composite target both of whose areal density were 139.5kg/m 2 against 14.5mm armor

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  • Ultra-High Molecular Weight Polyethylene Influence of

     · In 1962 UHMWPE a similarly low-friction but much more wear resistant polymer replaced PTFE in Charnley s hip arthroplasty with remarkably better performances. From then on arthroplasty has known considerable evolution but UHMWPE remains the gold standard for artificial hips and now other artificial joints including the knee and

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  • Influence of molecular weight of modified ultrahigh

     · Reciprocating friction and wear tests were carried out to investigate the influence of UHMWPE s MW on the tribological behavior of pure UHMWPE/Ti6Al4V and 15 add1-UHMWPE/Ti6Al4V under the condition of boundary lubrication with 25 vol. calf serum deionized water solution. Figure 1 describes the friction

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  • The effect of geometry and abduction angle on the

     · Contact pressure of UHMWPE acetabular cup has been shown to correlate with wear in total hip replacement (THR). The aim of the present study was to test the hypotheses that the cup geometry abduction angle thickness and clearance can modify the stresses in cemented polyethylene cups. Acetabular cups with different geometries (Link® IP and Lubinus eccentric) were tested cyclically in a

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  • Design and construction of a microtribometer and its use

     · Tribology is the study of friction lubrication and wear. Whenever two surfaces come into contact and relative motion as is the case in a joint there will be friction and wear. One of the most important factors in determining friction and wear in a system is the topography i.e. roughness of the surfaces involved.

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  • Finite Element Analysis to Probe the Influence of

     · No significant deviation was observed at the region adjacent to the spikes and the fins. This study recommends the use of the finned design particularly for weaker conditions. For stronger bones the combined design may also be recommended for higher stability. The use of HC-UHMWPE liner was found to be better for convensional shell

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  • Effect of radial and thickness of polyethylene on wear

     · thickness of 6 and 8 mm were the dimensions provided by the manufacturer while 4 and 12 mm were used by other model of TAR despite being out of range. Figure 3 The different thickness of meniscal bearing of (a) Linear wear depth (b) Volumetric wear depth and (c) Contact Pressure distribution after 5 million cycles at 20th instance of the

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  • The Influence of Proteins and Speed on Friction and

     · One of the key factors influencing the friction and wear is the thickness of lubricating film. Although several studies investigating the film thickness between the components of artificial joints have been published recently so far there is no a study considering the UHMWPE as one of the counterfaces.

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  • The Effect of the Wall Thickness on Wear of an UHMWPE

    Request PDF The Effect of the Wall Thickness on Wear of an UHMWPE Acetabular Liner A larger diameter of femoral head of artificial hip joint (AHJ) is commonly recommended for increasing range

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  • (PDF) Finite Element Study of the Effect of UHMWPE Liner

    Finite Element Study of the Effect of UHMWPE Liner Thickness on the Contact Area and Stress Distribution in a Bipolar Hip Joint May 2017 IOP Conference Series Materials Science and

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  • (PDF) The Influence of Implant Stiffness on Acetabular

    The design was modelled to have at least 1 mm of trabecular around the implant and a cortical thickness of 2 mm around the jawbone. The abutment heights are modeled as 4 mm for the

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  • Effects of UHMWPE viscoelasticity on the squeeze‐film

     · The described study attempted to investigate the effect of UHMWPE viscoelasticity on the elastohydrodynamic lubrication of such a soft artificial hip replacement under squeeze-film motion. A transient viscoelastic squeeze-film lubrication model of a typical hip implant was developed and solved to obtain the film thickness and pressure

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  • Effect of radial and thickness of polyethylene on wear

     · thickness of 6 and 8 mm were the dimensions provided by the manufacturer while 4 and 12 mm were used by other model of TAR despite being out of range. Figure 3 The different thickness of meniscal bearing of (a) Linear wear depth (b) Volumetric wear depth and (c) Contact Pressure distribution after 5 million cycles at 20th instance of the

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  • The function of bipolar hip prostheses-a laboratory study

    THE FUNCTION OF BIPOLAR HIP PROSTHESES-A LABORATORY STUDY USING CADAVERIC ACETABULA 39 Fig. 2 Assembly used to test self-righting mechanism under compressive load a position of maximum angulation from the horizontal before any load was applied as load was applied the head was forced to return towards the horizontal under

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  • The Effect of the Wall Thickness on Wear of an UHMWPE

    A larger diameter of femoral head of artificial hip joint (AHJ) is commonly recommended for increasing range of motion (RoM) and for avoiding dislocation. Unfortunately increasing that diameter will reduce the material liner thickness of the acetabular component. The behaviour of the AHJ contact system with thickness variation of the Ultra High Molecular Weight Polyethylene (UHMWPE

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  • Deformation of acetabular press-fit cups Influence of

     · The aim of this study was to assess the influence of a decreased cup wall thickness and screw holes on the deformation of the acetabular component as

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  • Impact of texturing on sliding wear behaviour of UHMWPE

     · study the impact of the initial chain orientation state on the wear behaviour of UHMWPE. To date only a limited number of works deals with this topic 8 12 13 and it is unclear whether texturing has a positive or negative effect on the sliding wear resistance of UHMWPE. I.3

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  • Wear Failure Analysis of UHMWPE Acetabular Cups in THR

    The UHMWPE acetabular cups are the most popular joints for joint prostheses after Charnley introduced UHMWPE for the acetabular component in 1962. It has been demonstrated that polyethylene wear remains the main source of particles in the THR and therefore requires particular attention. The paper presents a series of theoretical and practical aspects regarding the wear of acetabular cups (made

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  • The influence of design materials and kinematics on the

     · The wear of fixed bearing and rotating platform mobile bearing TKRs was compared using the Leeds ProSim six-station force/displacement controlled knee simulators (Barnett et al. 2002).Six (n=6) TKR of a single design were tested on the simulator for most test conditions.Femoral axial loading (maximum 2600 N) and extension–flexion (0°–58°) input profiles were adopted from the ISO 14243

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  • Evaluation of influence of changes in permeability with

     · As the first trial to evaluate the influence of aging of PVA FT hydrogels on friction and biphasic behaviors in this study medium values of material properties between new FT gel and aged FT gel preserved for more than 6 years are assumed as four representative examples (Aged FT-1 to Aged FT-4) with the same lower permeability and different

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  • STUDY ON FRICTION TEMPERATURE OF

     · In view of the actual condition of the sliding friction in the experiment the depth of wear is so small to be omitted approximately so the classical model of single heat source and infinite body sliding friction proposed by Jaeger 17 can be used. In this paper we test the friction temperature values of the UHMWPE/ multilayer

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  • Influence of MWCNTs and gamma irradiation on thermal

     · Differential scanning calorimetry (DSC) studies. In order to study the influence of γ-irradiation on various parameters like crystallinity melting temperature and lamellar thickness DSC studies were carried out on the samples.. Figures 1(a) and 1(b) show the DSC plots at 0 and 100 kGy doses for different weight fraction of MWCNTs in UHMWPE in the temperature range of 80–160 °C.

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  • Bulge micro-textures influence on tribological

    Bulge micro-textures influence on tribological performance of ultra-high-molecular-weight-polyethylene (UHMWPE) under improve the friction and wear resistance and reduce the surface temperature 15 16 . The actual contact But in this study only carbon coated UHMWPE samples were treated with a laser without considering

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  • Effects of reinforcements and gamma‐irradiation on wear

    The lower wear volume of UHMWPE-1 wt. Ag-1 wt. ZnO (5.8 10 −5 mm 3) was decreased by 48 than neat UHMWPE (8.6 10 −5 mm 3) suggesting the synergistic influence of both Ag and ZnO. 169 The study of Chitosan and ZnO embedded UHMWPE hybrid composites in terms of wear tensile strength were successfully carried out by Mohamad et al. 174

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  • Influence of MWCNTs and gamma irradiation on thermal

     · Differential scanning calorimetry (DSC) studies. In order to study the influence of γ-irradiation on various parameters like crystallinity melting temperature and lamellar thickness DSC studies were carried out on the samples.. Figures 1(a) and 1(b) show the DSC plots at 0 and 100 kGy doses for different weight fraction of MWCNTs in UHMWPE in the temperature range of 80–160 °C.

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  • The function of bipolar hip prostheses-a laboratory study

    THE FUNCTION OF BIPOLAR HIP PROSTHESES-A LABORATORY STUDY USING CADAVERIC ACETABULA 39 Fig. 2 Assembly used to test self-righting mechanism under compressive load a position of maximum angulation from the horizontal before any load was applied as load was applied the head was forced to return towards the horizontal under

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  • Fracture Behavior of the Cement Mantle of

     · Cup UHMWPE 690 0.35 Cement PMMA 2 300 0.30 Figure 1. Composition of the acetabulum 24 3. Finite Element Modelling The acetabulum was modeled using the finite element code Abaqus 6.11.1 30 . To simplify the study the 2D model of the acetabulum

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  • Study on influence of micro convex textures on

     · Because the rubbing pair samples are of the same material wear mass losses are used to qualitatively indicate the wear rates caused by friction and wear. The wear mass loss of convex textured and untreated UHMWPE-QSn7-0.2 copper rubbing pairs under 0.4 MPa and 50

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  • (PDF) The influence of acetabular cup material on pelvis

    Therefore 183 this study s easured redu tio i orti al o e loadi g a d predi ted increase in polar 184 cancellous loading with the UHMWPE cup is predicted to be conservative compared 185 with the un-bonded fixation of the metal and composite cups. 186 The results must be interpreted with consideration of their limitations.

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  • (PDF) Ultra-High Molecular Weight Polyethylene Influence

     · In 1962 UHMWPE a similarly low-friction but much more wear resistant polymer replaced PTFE in Charnley s hip arthroplasty with remarkably better

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  • (PDF) Effects of UHMWPE viscoelasticity on the squeeze

    The described study attempted to investigate the effect of UHMWPE viscoelasticity on the elastohydrodynamic lubrication of such a soft artificial hip replacement under squeeze‐film motion.

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