Thermomechanical analysis of ultra-high molecular weight polyethylene-metal hip prostheses

Rocchi, M.; Affatato, Saverio; Falasca, G; Viceconti, Marco

doi:10.1243/09544119jeim137

Cited by 13 publications

(7 citation statements)

References 17 publications

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“…Depending on the implant type and articulating materials, this increase was observed up to 7°C for a rotating hinge implant (CoCrMo - UHMWPE). In an analytical study, validated by simulator data, temperatures up to 51°C were found in CoCrMo - UHMWPE hip implants [16].…”

Section: Introductionmentioning

confidence: 95%

High-Tech Hip Implant for Wireless Temperature Measurements In Vivo

et al. 2012

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When walking long distances, hip prostheses heat up due to friction. The influence of articulating materials and lubricating properties of synovia on the final temperatures, as well as any potential biological consequences, are unknown. Such knowledge is essential for optimizing implant materials, identifying patients who are possibly at risk of implant loosening, and proving the concepts of current joint simulators. An instrumented hip implant with telemetric data transfer was developed to measure the implant temperatures in vivo. A clinical study with 100 patients is planned to measure the implant temperatures for different combinations of head and cup materials during walking. This study will answer the question of whether patients with synovia with poor lubricating properties may be at risk for thermally induced bone necrosis and subsequent implant failure. The study will also deliver the different friction properties of various implant materials and prove the significance of wear simulator tests. A clinically successful titanium hip endoprosthesis was modified to house the electronics inside its hollow neck. The electronics are powered by an external induction coil fixed around the joint. A temperature sensor inside the implant triggers a timer circuit, which produces an inductive pulse train with temperature-dependent intervals. This signal is detected by a giant magnetoresistive sensor fixed near the external energy coil. The implant temperature is measured with an accuracy of 0.1°C in a range between 20°C and 58°C and at a sampling rate of 2–10 Hz. This rate could be considerably increased for measuring other data, such as implant strain or vibration. The employed technique of transmitting data from inside of a closed titanium implant by low frequency magnetic pulses eliminates the need to use an electrical feedthrough and an antenna outside of the implant. It enables the design of mechanically safe and simple instrumented implants.

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Section: Introductionmentioning

confidence: 95%

High-Tech Hip Implant for Wireless Temperature Measurements In Vivo

et al. 2012

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“…Several research activities in the biotribology field are carried out at the Rizzoli Orthopaedic Institute in Bologna in collaboration with the University of Bologna. Different materials and geometries are experimentally tested using commercial joint simulators such as a 12-station hip joint simulator [92][93][94][95][96][97][98][99], a four-station knee joint simulator [100,101], and a three-station knee simulator [102]. Tests are usually run for some million cycles.…”

Section: Biotribologymentioning

confidence: 99%

“…Various roughness parameters were examined in relation to weight losses in reference [94] and skewness seems to give the best correlation. A thermomechanical analysis was also performed using finite-element model to predict the frictional heating and the contact stresses in a polyethylene-metal hip prosthesis [96].…”

Section: Biotribologymentioning

confidence: 99%

Tribology research trends in Italy

Ciulli

2009

Proceedings of the Institution of Mechanical Engineers, Part J:

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This paper furnishes a survey of recent investigations and of the current tribology research trends in Italy. Several topics related to tribology are investigated in several different departments of universities, research centres and industries. Some basic studies on friction and lubrication also at the atomic-scale level are reported. A big effort is addressed to researches on surface topography, contact mechanics aspects and particularly on surface coatings and treatments. Indentation and scratching techniques are used for the characterization of both coatings and bulk materials down to the nanoscale. Mechanical characterisation of materials and material processing involve tribological aspects too. Investigations on the wear behaviour of different materials for applications in the field of biotribology are also being carried out. The increasing interest of the industrial world in tribological problems is producing a lot of collaborations among universities, research centres and industries. Several tribological components and practical applications are investigated, such as lubricated sliding bearings, gas and magnetic bearings, gears, sealing systems, automotive and rail components. Investigations are often completed by diagnostic studies for monitoring or maintenance purposes

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“…Therefore, the contact mechanics of different types of THRs have been investigated by many researchers. Jin et al [12], Rocchi et al [13] and Wang et al [14] studied the contact mechanics of the UHMWPE acetabular cup, against a metallic or ceramic femoral head. Quesada et al [15] and Udofia et al [16] investigated the contact mechanics of MOM hipresurfacing prostheses.…”

Section: Introductionmentioning

confidence: 99%

Coupling of dynamics and contact mechanics of artificial hip joints in a pendulum model

Liu

Ellison

et al. 2010

Proc Inst Mech Eng H

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To date, fully coupled dynamics and contact mechanics analysis is still limited by expensive computational cost and long computing time and has not been addressed comprehensively, particularly in the hip joint. To understand the influence of different parameters on the biomechanics of the total hip replacement (THR) and improve its design, two numerical approaches were developed and implemented in finite element models to investigate the coupling between the dynamics response and the contact mechanics for three different THR configurations, metal-on-polyethylene (MOP), metal-on-metal (MOM), and ceramic-on-ceramic (COC). The dynamic force and the contact pressure distribution at the bearing surfaces from the two methods were predicted and compared. The influences of various parameters (motion angle, load applied in the pendulum, friction coefficient, geometry, and material properties) were subsequently investigated. From the comparisons, the decoupled method, based on the rigid-body dynamics and the quasi-static elastic contact mechanics, was adequate to predict the performance of the THRs efficiently. The load had the greatest influence on the dynamics/contact mechanics among other factors.

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Thermomechanical analysis of ultra-high molecular weight polyethylene-metal hip prostheses

Cited by 13 publications

References 17 publications

High-Tech Hip Implant for Wireless Temperature Measurements In Vivo

High-Tech Hip Implant for Wireless Temperature Measurements In Vivo

Tribology research trends in Italy

Coupling of dynamics and contact mechanics of artificial hip joints in a pendulum model

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