Analysis of friction and lubrication of human joint's surfaces

Sobociński, Michał

doi:10.17512/jamcm.2016.1.16

Cited by 3 publications

(2 citation statements)

References 1 publication

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“…Dry condition is achieved when the body grows old and is unable to secret the physiological lubricating oil. Sobocinski [30] reveals that lower friction is obtained in Ceramic on Plastic combination. The present work also compares the mechanical behavior of femoral head with three standard commercially available ceramic materials, namely alumina, zirconia and zirconia-toughened alumina (ZTA), articulate against plastic liner material i.e.…”

Section: Introductionmentioning

confidence: 98%

Dry and Wet Lubrication Analysis for Multi-Material Hip Assembly

Ravikant

Mittal

Gupta³

2022

Int. J. Automot. Mech. Eng.

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Hip joint repair/replacement is one of the most thriving orthopedic surgical procedures in the human body. The group of patients undergoing hip replacement considerably includes young and physically active persons with varying movements thus requiring longer product life and ease of maintenance. Perfect lubrication in hip assembly ensures a low wear rate and better product life. The present work focuses on dry and wet lubrication analysis of complete implant assembly instead of an individual part. The assembly consists of a stem, head, liner and cup, each made of different materials like a ceramic femoral head mounted over a metallic femoral stem with a polyethylene liner and a metallic acetabular cup. In this work, eight metal-materials are considered for stem/cup, three ceramic materials for the head and two polyethylene materials for the liner. The combinations of these materials are evaluated for various mechanical parameters. Dry (µ = 0.13) and wet (µ = 0.05) lubricating conditions between the liner and femoral head have been considered and their effects on the head, liner and cup have been evaluated for the optimization of Hip joint design. Fifty percent of re-surgery cases arise because of excessive wear out resulting in aseptic loosening of the femoral head and liner interface. Femoral head of size 28 mm diameter with 2 mm thick liner and 3 mm thick acetabular cup are modeled and are analyzed for axial pay load of 2.3 kN. The maximum von mises stress and total deformation for various material combinations of implant assembly have been compared to select the most suitable one for the arthroplasty implantation. The combination of CoCrMo – Ceramics – HXLPE – CoCrMo demonstrates minimum stress and deformation for all three parts i.e. femoral head, liner and acetabular cup under present loading and boundary conditions. ZTA is emerged as the preferred ceramic material for femoral head having a higher compressive strength.

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Section: Introductionmentioning

confidence: 98%

Dry and Wet Lubrication Analysis for Multi-Material Hip Assembly

Ravikant

Mittal

Gupta³

2022

Int. J. Automot. Mech. Eng.

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“…One of the most frequently used pairs in endoprostheses is an UHMWPE cup with a Ti6Al4V head. For such pairs, the coefficient of friction (dry friction) is in the range of 0.07-0.14 [86]. Hence, the coefficient of friction value of 0.15 for Ti6Al4V-PA was very good;…”

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confidence: 96%

Deposition of Biocompatible Polymers by 3D Printing (FDM) on Titanium Alloy

2022

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Nowadays, the replacement of a hip joint is a standard surgical procedure. However, researchers have continuingly been trying to upgrade endoprostheses and make them more similar to natural joints. The use of 3D printing could be helpful in such cases, since 3D-printed elements could mimic the natural lubrication mechanism of the meniscus. In this paper, we propose a method to deposit plastics directly on titanium alloy using 3D printing (FDM). This procedure allows one to obtain endoprostheses that are more similar to natural joints, easier to manufacture and have fewer components. During the research, biocompatible polymers suitable for 3D FDM printing were used, namely polylactide (PLA) and polyamide (PA). The research included tensile and shear tests of metal–polymer bonds, friction coefficient measurements and microscopic observations. The friction coefficient measurements revealed that only PA was promising for endoprostheses (the friction coefficient for PLA was too high). The strength tests and microscopic observations showed that PLA and PA deposition by 3D FDM printing directly on Ti6Al4V titanium alloy is possible; however, the achieved bonding strength and repeatability of the process were unsatisfactory. Nevertheless, the benefits arising from application of this method mean that it is worthwhile to continue working on this issue.

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Effect of design and surgical parameters variations in mobile‐bearing versus fixed‐bearing unicompartmental knee arthroplasty: A finite element analysis

Luyckx,

Bori,

Saldari

et al. 2024

J. exp. orthop.

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PurposeUnicompartmental knee arthroplasty (UKAs) are available in the market as fixed‐ and mobile‐bearing (FB and MB) and can be characterised by a different set of design parameters in terms of geometries, materials and surgical approaches, with overall good clinical outcomes. However, clear biomechanical evidence concerning the consequences of variations of these features on knee biomechanics is still lacking; therefore, the present study aims to perform a sensitivity analysis to see which outcomes are affected by these variations.MethodsFor both MB‐UKA and FB‐UKA, five design and surgical parameters were defined (bearing insert thickness, tibial component material, implant components friction coefficient, antero‐posterior slope angle and level of tibial bone resection). Two control models were defined based on standard configurations for both implants. Finite element analysis was chosen to perform this study, and different parameter combinations (216 models in total) were implemented and tested at both 0° and 90° of flexion, using a previously validated finite element knee model. The results were then evaluated in terms of bone and polyethylene Von Mises stress and tibio‐femoral contact area.ResultsBearing thickness, tibial bone cut and slope angle were found to be the most sensitive parameters for both types of UKAs. Specifically, changes in these parameters in the FB‐UKA appeared to induce more significant variations in the polyethylene insert (both in terms of polyethylene stress and contact area), while in the MB‐UKA, these changes influenced bone stress distribution more.ConclusionsSurgical parameters returned to have a more significant influence than material and friction variations; furthermore, the outcomes most affected by parameter variations were the insert‐related ones for FB‐UKA while for the MB‐UKA were the ones regarding tibial bone stresses.Level of EvidenceNot Applicable.

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Analysis of friction and lubrication of human joint's surfaces

Cited by 3 publications

References 1 publication

Dry and Wet Lubrication Analysis for Multi-Material Hip Assembly

Dry and Wet Lubrication Analysis for Multi-Material Hip Assembly

Deposition of Biocompatible Polymers by 3D Printing (FDM) on Titanium Alloy

Effect of design and surgical parameters variations in mobile‐bearing versus fixed‐bearing unicompartmental knee arthroplasty: A finite element analysis

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