Metrology for Dual Taper Total Hip Arthroplasty

Citters, Douglas W. Van; Assael, Dylan; Currier, John H.

doi:10.1520/stp159120140137

Cited by 3 publications

(3 citation statements)

References 14 publications

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“…An alternative method [63], established a central anterior-posterior semiplane by fitting semicircles to the half conical surfaces of the taper at several axial heights, averaging the co-ordinates which composed the central axes of each half cone, and fitting to the averaged points. Regions which were not in contact with the femoral counterface were manually selected in the same manner as the previously described method of Buente et al [33] and used to generate a geometrically ideal surface from which to delineate material loss.…”

Section: Determination Of Materials Lossmentioning

confidence: 99%

“…The sum of the element volumes represent the overall material loss volume (excluding elements smaller than the accuracy of the measurement instrument) [43]. This method is also valid for type C tapers, however, the element volume must instead be evaluated by the shortest distance between any measurement point to the unworn reference surface [33,63].…”

Section: Determination Of Materials Lossmentioning

confidence: 99%

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Comparison and appraisal of techniques for the determination of material loss from tapered orthopaedic surfaces

Dransfield

Addinall

Bills

2021

Wear

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Section: Determination Of Materials Lossmentioning

confidence: 99%

Section: Determination Of Materials Lossmentioning

confidence: 99%

Comparison and appraisal of techniques for the determination of material loss from tapered orthopaedic surfaces

Dransfield

Addinall

Bills

2021

Wear

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“…The severity and morphology of corrosion damage has been hypothesized to be functions of metallurgy, metal combination, surface topography, taper geometry, and flexural rigidity . Elevated metal ion levels, pseudotumors, and muscle tissue necrosis reported in metal‐on‐polyethylene constructs suggest that corrosion at the head–neck junction is sufficient to induce metal‐related biological reactions without contributions from metal‐on‐metal articulation .…”

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confidence: 99%

Role of corrosion in taper failure and head disassociation in total hip arthroplasty of a single design

Martin

Jenkins

Citters

2018

Journal Orthopaedic Research

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Modular junctions have been associated with corrosion in total hip arthroplasty. In a small number of cases, disassociation of the femoral head from the stem following gross wear of the taper has been reported. The purpose of this study was to investigate the role of corrosion in the development of mechanical changes leading to disassociation. Twenty-one retrieved stems and heads of one design previously reported with head disassociation were identified in an IRB-approved database. Components were scored for corrosion and measured for material loss. Stem alloy hardness was measured. Parametric and non-parametric statistics were performed (α < 0.05). Seven of twenty-one stems demonstrated gross material loss of the stem taper and head disassociation. The maximum linear depth (MLD) of material loss on stem tapers without dissociation and all head bores was 7.63 ± 6.04 and 63.76 ± 60.83 μm, respectively. Hardness of the stem material was statistically distinct, but similar to other stem materials. Results suggest material loss via corrosion at the head bore loosens the taper lock, allowing relative motion leading to abrasive wear of the stem taper. All cases of disassociation occurred at greater than 65 months with a minimum of 50 μm of loss at on the head bore. It may be warranted to survey patients with systems reporting head disassociation; for this system, including recalled heads, risk appears to begin after 6 years in vivo. © 2018 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res.

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Using Coordinate Measuring Machine Validated with White Light Interferometry to Identify Contributors to Material Loss Due to Corrosion of Total Hip Replacement Modular Junctions

Martin

McGrory

Edidin

et al. 2018

Beyond the Implant: Retrieval Analysis Methods for Implant Surveillance

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Clinical sequelae have been associated with corrosion of modular junctions in total hip arthroplasty. These sequelae, including local adverse reactions to corrosion by-products, have been observed with metal-on-metal and conventional metal-on-polyethylene systems. Retrieval analysis can quantify material loss at modular interfaces, permitting correlation with prosthetic and patient factors. The purpose of this study was to quantify and characterize material loss at the head-stem junction of retrieved metal-on-polyethylene systems exhibiting imprint corrosion to identify parameters associated with corrosion in vivo and to establish a model of error for ex vivo material loss measurements. A coordinate measuring machine (CMM) was used to measure volume loss, maximum linear depth (MLD), and taper angle of 18 head bores and four stem tapers of the same manufacturer. The CMM used a 3-mm diameter ruby stylus to trace 72 axial lines across the taper surfaces. Five heads were bivalved for white light profilometry to validate MLD measured by the CMM. An error budget model, comparing interferometry with CMM measurements, was mathematically calculated and experimentally measured, providing error bounds for interpreting CMM-based material loss data. Median volume loss and MLD on the head bores were 1.63 (−2.56,12.49) mm3 and 27.94 (1.85,74.93) µm, respectively. Median head taper angle was statistically smaller than stem tapers angles, indicating distal engagement (p = 0.009). Maximum material loss was found to be on the portion of the head bore closest to the lesser trochanter, in an area of high stress and greatest contact with stem taper. This suggests continuous disturbance of the protective oxide in this region, promoting corrosive action. Stress may play a role in promoting corrosion, but further experimentation is necessary to fully characterize imprinting processes. A model of error was created for the interpretation of CMM measurements. The magnitude of material loss closely matched the interferometry results.

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Metrology for Dual Taper Total Hip Arthroplasty

Cited by 3 publications

References 14 publications

Comparison and appraisal of techniques for the determination of material loss from tapered orthopaedic surfaces

Comparison and appraisal of techniques for the determination of material loss from tapered orthopaedic surfaces

Role of corrosion in taper failure and head disassociation in total hip arthroplasty of a single design

Using Coordinate Measuring Machine Validated with White Light Interferometry to Identify Contributors to Material Loss Due to Corrosion of Total Hip Replacement Modular Junctions

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