Design and evaluation of a device for measuring three-dimensional micromotions of press-fit femoral stem prostheses

Bühler, D.W.; Oxland, Thomas R.; Nolte, Lutz P.

doi:10.1016/s1350-4533(96)00060-4

Cited by 52 publications

(33 citation statements)

References 28 publications

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“…We have also verified that this error was sufficient to detect detrimental micromotions, and their location. The maximal amplitude of micromotion was consistent with typical reported values in the literature (Walker et al, 1987;Gilbert et al, 1992;Buhler et al, 1997;Britton et al, 2004).…”

Section: Discussionsupporting

confidence: 90%

“…However, even if the problem is clearly observed and partly quantified, measurement methods are not fully satisfactory. Most of the studies are using linear variable differential transducers (LVDT's) (Walker et al, 1987;Gilbert et al, 1992;Buhler et al, 1997;Britton et al, 2004;Gheduzzi and Miles, 2007) which do not really measure the local relative micromotion between the stem and the bone, but also include bone deformation between the device fixation and the measurement site. Besides, the number of simultaneous measurement points is limited to 1 or 2, with a reported maximum of 4 (Cristofolini et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

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A new technique to measure micromotion distribution around a cementless femoral stem

Gortchacow¹,

Wettstein²,

Pioletti³

et al. 2011

Journal of Biomechanics

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a b s t r a c tThe interfacial micromotion is closely associated to the long-term success of cementless hip prostheses. Various techniques have been proposed to measure them, but only a few number of points over the stem surface can be measured simultaneously. In this paper, we propose a new technique based on micro-Computer Tomography (mCT) to measure locally the relative interfacial micromotions between the metallic stem and the surrounding femoral bone. Tantalum beads were stuck at the stem surface and spread at the endosteal surface. Relative micromotions between the stem and the endosteal bone surfaces were measured at different loading amplitudes. The estimated error was 10 mm and the maximal micromotion was 60 mm, in the loading direction, at 1400 N. This pilot study provided a local measurement of the micromotions in the 3 direction and at 8 locations on the stem surface simultaneously. This technique could be easily extended to higher loads and a much larger number of points, covering the entire stem surface and providing a quasi-continuous distribution of the 3D interfacial micromotions around the stem. The new measurement method would be very useful to compare the induced micromotions of different stem designs and to optimize the primary stability of cementless total hip arthroplasty.

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Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

A new technique to measure micromotion distribution around a cementless femoral stem

Gortchacow¹,

Wettstein²,

Pioletti³

et al. 2011

Journal of Biomechanics

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show abstract

“…This measure is usually divided into subsidence (Steimer et al, 2006) and micromotion (Baleani et al, 2000). Recent studies are mainly using linear variable differential transducers (LVDT's) (Walker et al, 1987;Gilbert et al, 1992;Buhler et al, 1997;Britton et al, 2004;Cristofolini et al, 2007;Gheduzzi and Miles, 2007. LVDT however do not really measure the local relative micromotion between the stem and the bone, but also include bone deformation between the device fixation and the measurement site.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous and multisite measure of micromotion, subsidence and gap to evaluate femoral stem stability

Gortchacow

Wettstein

Pioletti

et al. 2012

Journal of Biomechanics

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a b s t r a c tThe initial stability of cementless femoral components is crucial for the long-term success of total hip arthroplasty. This has been reported in animal and clinical studies. Until now, the stability was evaluated by the measurement of relative micromotion on a few simultaneous locations around the stem in cadaveric experiments. This paper presents an extended experimental setup to measure simultaneously local micromotion, subsidence and gap on hundreds of points at the bone-stem interface. This technique we applied to anatomical and straight stems in three pairs of cadaveric femurs. Measurements were in agreement with typically reported values. Conversely to other methods, which measure micromotion between implant and bone anchoring points of the measuring device, our method provides local micromotion between stem surface and adjacent bone surface. The observed variation of micromotion at the peri-implant surface confirms the importance of this simultaneous measure on a lot of points around the implant.

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“…The LVDT is one of the most widespread positioning sensors used in harsh environments such as industrial plants, nuclear plants, and particle accelerators, due to contactless sensing, good linearity, virtually infinite resolution, low temperature sensitivity, robustness, and easy-to-implement radiation hardness. Therefore, the LVDT is used in a large variety of applications such as in the industry and in research centers [2]- [6]. It is a differential transformer consisting of one primary and two secondary coils, which are wound around a metallic foil.…”

Section: A Lvdt Working Principlementioning

confidence: 99%

Automatic Test Bench for Measurement of Magnetic Interference on LVDTs

Spiezia

Losito

Martino

et al. 2011

IEEE Trans. Instrum. Meas.

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Abstract-This paper proposes an automatic test bench, based on a rigorous and repeatable measurement procedure, for the analysis of a position sensor linear variable differential transformer (LVDT). The test bench allows complete characterization of an LVDT sensor working in an interfering magnetic field by evaluating the uncertainty and nonlinearity of the sensor. This issue is addressed in neither the sensor datasheet nor the scientific literature. The potential of the method and the performance of the automated test bench are proven by measuring the main sensor characteristics such as nonlinearity and uncertainty, and the error of a position reading due to external magnetic interference on two commercial LVDTs. The sensors are based on two different reading techniques, and both are analyzed using current and voltage excitations. In fact, the test bench permits to study the robustness of the sensor with respect to external magnetic fields by comparing position drifts due to interference at varying source excitations and reading techniques.Index Terms-Automatic testing, magnetic field effects, magnetic field measurements, magnetic variable measurements.

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Design and evaluation of a device for measuring three-dimensional micromotions of press-fit femoral stem prostheses

Cited by 52 publications

References 28 publications

A new technique to measure micromotion distribution around a cementless femoral stem

A new technique to measure micromotion distribution around a cementless femoral stem

Simultaneous and multisite measure of micromotion, subsidence and gap to evaluate femoral stem stability

Automatic Test Bench for Measurement of Magnetic Interference on LVDTs

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