In Vitro Quantification of Wear in Tibial Inserts Using Microcomputed Tomography

Teeter, Matthew G.; Naudie, Douglas D.R.; McErlain, David D.; Brandt, J.; Yuan, Xunhua; MacDonald, Steven J.; Holdsworth, David W.

doi:10.1007/s11999-010-1490-6

Cited by 43 publications

(42 citation statements)

References 18 publications

(47 reference statements)

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“…A nominal density of 935 kg/m 3 was used for extruded GUR 1020 inserts and 931 kg/m 3 was used for extruded GUR 1050 inserts. The accuracy and error associated with this imaging technique have been previously reported [21].…”

Section: Methodsmentioning

confidence: 93%

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Can Microcomputed Tomography Measure Retrieved Polyethylene Wear? Comparing Fixed-bearing and Rotating-platform Knees

Engh

Zimmerman

Hopper

et al. 2013

Clinical Orthopaedics &Amp; Related Research

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Background Wear of total knee polyethylene has been quantified gravimetrically with thickness measurements and evaluation of surface wear modes. However, these techniques do not localize volumetric wear. Questions/Purposes We used micro-CT scans of retrieved total knee liners and unworn, new liners to determine the volume and location of wear. Methods We retrieved 12 fixed and 12 rotating-platform bearings after a mean 52 months of use. Inserts were weighed and thickness was measured. Micro-CT scans of retrieved and matched new liners were superimposed to compare the location and magnitude of wear. Results The average total wear was 254 ± 248 mm 3 . The average wear rate was 58 ± 41 mm 3 /year. Wear was 69% of penetration, demonstrating the contribution of deformation to knee wear. Rotating-platform wear rate was 43 ± 25 mm 3 /year and the fixed-bearing rate was 74 ± 49 mm 3 /year. Five percent of the rotating-platform wear rate came from the backside compared with 14% of the fixed-bearing wear rate. Conclusions Micro-CT can determine the volume and location of wear of retrieved tibial liners. Because the magnitude of the manufacturing tolerances was approximately half the magnitude of the total wear on average, accounting for the potential influence of tolerances is important to accurately measure volumetric wear if the unworn (preimplantation) geometry of the insert is unknown. Without accounting for tolerances, this technique may not be applicable for retrievals with a short followup that have low wear. However, application of micro-CT could be of value in determining the exact location of wear in knee simulator studies in which the same insert is measured repeatedly and manufacturing tolerances are not a concern.

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Section: Methodsmentioning

confidence: 93%

“…Micro-CT has also been used and validated as a tool to measure simulator worn tibial polyethylene components [21]. Micro-CT scans of polyethylene before and after knee simulator wear were used to create threedimensional models of the polyethylene liner.…”

Section: Introductionmentioning

confidence: 99%

Can Microcomputed Tomography Measure Retrieved Polyethylene Wear? Comparing Fixed-bearing and Rotating-platform Knees

Engh

Zimmerman

Hopper

et al. 2013

Clinical Orthopaedics &Amp; Related Research

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“…Each insert was scanned with a laboratory micro-computed tomography (micro-CT) scanner according to an established protocol [14]. Both the retrieved inserts, and identically sized never-implanted inserts were imaged.…”

Section: Methodsmentioning

confidence: 99%

Contribution of Surface Polishing and Sterilization Method to Backside Wear in Total Knee Arthroplasty

Teeter

Lanting

Shrestha

et al. 2015

The Journal of Arthroplasty

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“…Since the IPL software can determine the volume of the specimen, Micro-CT can also be used to determine the volume loss with reference data provided [19,20], which is like gravimetric measurements. However, for retrievals or cases similar to the present study, due to the absence of prewear data, the reference surface is not available, surface curve fitting methodology based on CMM coordinates and image digitization would be more appropriate to determine the volume loss.…”

Section: Resultsmentioning

confidence: 99%

Comparison of CMM and Micro-CT Volumetric Analysis of Polyethylene Tibial Knee Inserts in Total Knee Replacement

Jiang

Hua-xing

et al. 2018

International Journal of Polymer Science

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Ultrahigh molecular weight polyethylene (UHMWPE) bearings are used widely in orthopaedic joint replacement as a prominent material for improving the longevity, which is dramatically influenced by wear of polyethylene. Polyethylene tibial knee components from knee simulators under two different input conditions were analyzed using CMM and Micro-CT measurement techniques for volumetric loss with gravimetric measurement as reference. Based on the coordinates and image slices obtained, the surface curve fitting and image digitization methodology were used for the creation of nominal "original" surface in the case of no prewear data provided. The comparison results indicate that gravimetric remains the gold standard and the CMM measurement took less time and had better precision, accuracy, and repeatability compared to Micro-CT measurement technique.

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In Vitro Quantification of Wear in Tibial Inserts Using Microcomputed Tomography

Cited by 43 publications

References 18 publications

Can Microcomputed Tomography Measure Retrieved Polyethylene Wear? Comparing Fixed-bearing and Rotating-platform Knees

Can Microcomputed Tomography Measure Retrieved Polyethylene Wear? Comparing Fixed-bearing and Rotating-platform Knees

Contribution of Surface Polishing and Sterilization Method to Backside Wear in Total Knee Arthroplasty

Comparison of CMM and Micro-CT Volumetric Analysis of Polyethylene Tibial Knee Inserts in Total Knee Replacement

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