A hip joint simulator study of the performance of metal-on-metal joints*1Part I: The role of materials

Dowson, D.; Hardaker, C.; Flett, Magnus; Isaac, Graham

doi:10.1016/s0883-5403(04)00514-5

Cited by 52 publications

(58 citation statements)

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“…In these studies the premature failure was attributed to aseptic loosening from increased polyethylene wear. With a metal-on-metal bearing surface several in vitro studies have shown the wear characteristics to be much more favourable [14][15][16].…”

Section: Discussionmentioning

confidence: 99%

Sporting and physical activity following hip resurfacing

Fisher

Kıllampallı

Kundra

et al. 2010

International Orthopaedics (SICOT)

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Section: Discussionmentioning

confidence: 99%

Sporting and physical activity following hip resurfacing

Fisher

Kıllampallı

Kundra

et al. 2010

International Orthopaedics (SICOT)

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“…However, carbide structure and number do not seem to influence wear resistance significantly. The difference in wear resistance between cast and wrought components seems to be only marginal [6,8]. Hip simulator tests have shown that low carbon implants have inferior wear properties and therefore most devices are made of high carbon content alloys [10].…”

Section: Discussionmentioning

confidence: 99%

“…At this point in time, it is not possible to derive clinical performance expectations from differences in design, material or manufacturing method. Hip simulator tests seem to favour some material and design combinations [5,8,9,10], but clinical data for each implant are necessary for complete evaluation of each resurfacing system. Widespread use of a specific design can only be recommended if long-term clinical follow-up studies are performed and analysed with respect to the design parameters examined in this study.…”

Section: Discussionmentioning

confidence: 99%

Ten different hip resurfacing systems: biomechanical analysis of design and material properties

Heisel

Kleinhans

Menge

et al. 2008

International Orthopaedics (SICOT)

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This study gives an overview of the main macroand microstructural differences of ten commercially available total hip resurfacing implants. The heads and cups of resurfacing hip implants from ten different manufacturers were analysed. The components were measured in a coordinate measuring machine. The microstructure of the heads and cups was inspected by scanning electron microscopy. The mean radial clearance was 84.86 μm (range: 49.47-120.93 μm). The implants were classified into three groups (low, medium and high clearance). All implants showed a deviation of roundness of less than 10 μm. It was shown that all implants differ from each other and a final conclusion about the ideal design and material combination cannot be given based on biomechanical data. Widespread use of specific designs can only be recommended if clinical long-term follow-up studies are performed and analysed for each design.

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“…Most of the available literature on this subject is mostly formulated on the tribological level, in the measure that the geometrical properties (e.g., clearance size) of the hip implants are not considered as variables. The kinematic (e.g., angular velocities) and dynamic (e.g., applied forces) characteristics of the hip elements are also assumed to be constant in most of the studies [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Spatial rigid-multibody systems with lubricated spherical clearance joints: modeling and simulation

2009

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The dynamic modeling and simulation of spatial rigid-multi-body systems with lubricated spherical joints is the main purpose of the present work. This issue is of paramount importance in the analysis and design of realistic multibody mechanical systems undergoing spatial motion.When the spherical clearance joint is modeled as dry contact; i.e., when there is no lubricant between the mechanical elements which constitute the joint, a body-to-body (typically metal-tometal) contact takes place. The joint reaction forces in this case are evaluated through a Hertzian-based contact law. A hysteretic damping factor is included in the dry contact force model to account for the energy dissipation during the contact process. The presence of a fluid lubricant avoids the direct metal-to-metal contact. In this situation, the squeeze film action, due to the relative approaching motion between the mechanical joint elements, is considered utilizing the lubrication theory associated with the spherical bearings. In both cases, the intrajoint reaction forces are evaluated as functions of the geometrical, kinematical and physical characteristics of the spherical joint. These forces are then incorporated into a standard formulation of the system's governing equations of motion as generalized external forces. A spatial four bar mechanism that includes a spherical clearance joint is considered here as example. The computational simulations are carried out with and without the fluid lubricant, and the results are compared with those obtained when the system is modeled with perfect joints only. From the general results it is observed that the system's performance with lubricant effect presents fewer peaks in the kinematic and dynamic outputs, when compared with those from the dry contact joint model.

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A hip joint simulator study of the performance of metal-on-metal joints*1Part I: The role of materials

Cited by 52 publications

References 0 publications

Sporting and physical activity following hip resurfacing

Sporting and physical activity following hip resurfacing

Ten different hip resurfacing systems: biomechanical analysis of design and material properties

Spatial rigid-multibody systems with lubricated spherical clearance joints: modeling and simulation

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