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233 results on '"van der Heide, Emile"'

31. The Effect of Layer Variation Between Liner and Cement Mantle on Reducing Cracks of PMMA Material Hip Joints

Author

Saputra Eko, Jamari J, Lie Han Ay, Anwar Iwan Budiwan, Ismail Rifky, Tauviqirrahman Mohammad, and van der Heide Emile

Subjects
Cement mantle, liner, PMMA, hip joint, crack, stress, Environmental sciences, GE1-350
Abstract

Failure of cement mantle of bond loosening between liner and cement mantle is an important issue in total hip replacement. Two factors that commonly cause cement mantle failure are initial crack and stress. A solution for reducing stress on the cement mantle has been proposed by adding insertion material between liner and cement mantle. Nevertheless, further study is needed to optimize the proposed solution. A possible option is to vary the thickness of the insertion material. If the thickness of the PMMA material is constant, then the variation of the insertion thickness will be followed by the variation of the thickness of the liner. Consequently, the stress value on the liner will follow the variation of liner thickness. The objective of this study is to examine the effect of the thickness variation of the insertion material to stress on cement mantle and liner using finite element simulation. Results revealed that the magnitude of stress and deflection decreased in the cement mantle and the liner along with the increasing thickness of the insertion material.

Published
2018
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38. Epilamization/Barrier Films

Author

Astakhov, Viktor, primary, van der Heide, Emile, additional, Jan Schipper, Dirk, additional, Michielsen, Stephen, additional, Liang, Hong, additional, Shi, Bing, additional, Hodgson, Alexia, additional, Virtanen, Sannakaisa, additional, Wabusseg, Heimo, additional, and Rymuza, Zygmunt, additional

Published
2004
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41. The Effect of Additional Layer between Liner and PMMA on Reducing Cracks of Cement Mantle Hip Joints

Author

Han, Ay Lie, Jamari, J., Budiwan Anwar, Iwan, van der Heide, Emile, Han, Ay Lie, Jamari, J., Budiwan Anwar, Iwan, and van der Heide, Emile

Abstract

Loosening of the acetabular liner component caused by the failure of the cement mantle is a complex phenomenon in a total hip arthroplasty. This failure is often associated with the occurrence of cracking in the cement mantle. Investigation of this cracking can be performed by fatigue test or simulation. Cracking can be caused by initial cracks (porosity), defects of cement mantle, or stress due to repeated loading. An initial crack may be caused by material defects. The stress depends on the load and on the strength of the material itself. To reduce crack failure, one can minimize the initial crack or optimize the thickness of the cement mantle and reduce stress that occurs in the cement mantle. This study offers a solution for reducing the intensity of stress on the cement mantle by providing an additional metal layer between the liner and the acetabular component cement mantle. The study is performed by simulating static contact using finite element analysis. Results show that the additional layer between the acetabular liner and the cement mantle can significantly reduce the stress on the contact surface of the cement mantle.

Published
2018

50. The tribological behaviour of skin equivalent materials and ex-vivo human skin during sliding contact with artificial turf

Author

Morales Hurtado, Marina, Zeng, Xiangqiong, Peppelman, Malou, Van Erp, Nielka P., Van der Heide, Emile, and Universidad Politécnica de Cartagena

Subjects
Ingeniería Mecánica, integumentary system, Friction, Artificial turf, Abrasion, Sliding, IBERTRIB, Skin
Abstract

The use of synthetic materials for outdoor and indoor sport fields has increased over the last decades. Artificial turfs, commonly used on football fields, are basically infilled with recycled crumb rubber derived from old tires, the main of which are NBR (acrylonitrile butadiene rubber) and SBR (styrene-butadiene rubber) with fibers usually made of Polyethylene (PE) or Nylon. The use of these polymers for artificial turf designing purposes has caused controversy to whether their impact in human health, especially in skin abrasions during players sliding on the artificial turf. We have studied the tribological performance of different artificial human skin and real human skin against NBR, PE and Nylon 6.6 at different environmental conditions: normal conditions (25 ˚C and 50% of relative humidity) and high humidity conditions (37 ˚C and 80% of relative humidity) and forces of 2 and 4 N to achieve the association between friction and skin damage. The applied forces correspond to a range of pressures of 121 to 175 kPa and the experiments were conducted at 50 mm/s. The friction coefficient was obtained for different artificial skin samples: Lorica, Silicone L7350, pure PDMS, Cutinova and ESE (an epidermal skin equivalent developed by us), and these results were compared to those obtained from excised human skin samples obtained from healthy people after a surgery carried out at the Radboud Hospital of Nijmegen. Later on the human skin samples were analyzed with confocal microscopy and histological images to study the case of the surface properties of skin and determine any possible damage on the Stratum Corneum related to the tribological tests.

Published
2015

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