Methods for Characterization of Edge Wear in Ceramic-On-Ceramic Acetabular Cups

Darshil Kapadia, Radu Racasan, Luca Pagani, Mazen Al-Hajjar, Paul Bills

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Current methodologies for assessing wear on acetabular cups have focused on quantifying the amount of material loss on the bearing surface. The bearing surface is constituted by well-defined geometry and surface characteristics. As such, methods are able to estimate the unworn surface and determine the amount of material loss. When edge wear is present at the boundary between the bearing surface and outer cup geometry, it is normally thresholded during the analysis process. This can potentially underestimate the amount of wear present on acetabular cups. This paper details the requirements and methodologies for measurement and analysis of edge wear and focuses on ceramic liners. Two methodologies have been developed based on measurements using a coordinate measuring machine and a roundness measuring machine. The entire bearing surface as well as the edge geometry can be scanned using a coordinate measuring machine. A new analysis methodology has been developed to recreate the edge geometry using segmentation and identification of unworn areas. Based on the reconstructed surface, a wear map is produced and the volume of wear is quantified. The second method, based on the roundness measuring machine, is capable of nanometer-scale resolution point measurement for a defined measurement range. Because of the 2-mm limitation in the gauge measurement range, only a well-defined area located on both the bearing surface and the edge surface can be measured. The roundness traces are used to reconstruct a surface map that is analyzed based on a newly developed methodology. Both methods have been evaluated using ceramic liners tested in vitro under edge loading conditions, and the volume loss is compared to gravimetric measurements. The results show that both methods have the required resolution to measure volume loss of less than 1 mm3 and are thus capable of providing a volume loss estimation for ceramic acetabular cups.

LanguageEnglish
Title of host publicationBeyond the Implant
Subtitle of host publicationRetrieval Analysis Methods for Implant Surveillance
EditorsWilliam M. Mihalko, Jack E. Lemons, A. Seth Greenwald, Steven M. Kurtz
PublisherASTM International
Pages156-172
Number of pages17
VolumeSTP 1606
ISBN (Electronic)9780803176584
ISBN (Print)9780803176577
DOIs
Publication statusPublished - 30 Jun 2018

Fingerprint

Bearings (structural)
Wear of materials
Coordinate measuring machines
Geometry
Gages

Cite this

Kapadia, D., Racasan, R., Pagani, L., Al-Hajjar, M., & Bills, P. (2018). Methods for Characterization of Edge Wear in Ceramic-On-Ceramic Acetabular Cups. In W. M. Mihalko, J. E. Lemons, A. S. Greenwald, & S. M. Kurtz (Eds.), Beyond the Implant: Retrieval Analysis Methods for Implant Surveillance (Vol. STP 1606, pp. 156-172). ASTM International. https://doi.org/10.1520/STP160620170097
Kapadia, Darshil ; Racasan, Radu ; Pagani, Luca ; Al-Hajjar, Mazen ; Bills, Paul. / Methods for Characterization of Edge Wear in Ceramic-On-Ceramic Acetabular Cups. Beyond the Implant: Retrieval Analysis Methods for Implant Surveillance. editor / William M. Mihalko ; Jack E. Lemons ; A. Seth Greenwald ; Steven M. Kurtz. Vol. STP 1606 ASTM International, 2018. pp. 156-172
@inbook{2021a646c6804351b6978fde218e2175,
title = "Methods for Characterization of Edge Wear in Ceramic-On-Ceramic Acetabular Cups",
abstract = "Current methodologies for assessing wear on acetabular cups have focused on quantifying the amount of material loss on the bearing surface. The bearing surface is constituted by well-defined geometry and surface characteristics. As such, methods are able to estimate the unworn surface and determine the amount of material loss. When edge wear is present at the boundary between the bearing surface and outer cup geometry, it is normally thresholded during the analysis process. This can potentially underestimate the amount of wear present on acetabular cups. This paper details the requirements and methodologies for measurement and analysis of edge wear and focuses on ceramic liners. Two methodologies have been developed based on measurements using a coordinate measuring machine and a roundness measuring machine. The entire bearing surface as well as the edge geometry can be scanned using a coordinate measuring machine. A new analysis methodology has been developed to recreate the edge geometry using segmentation and identification of unworn areas. Based on the reconstructed surface, a wear map is produced and the volume of wear is quantified. The second method, based on the roundness measuring machine, is capable of nanometer-scale resolution point measurement for a defined measurement range. Because of the 2-mm limitation in the gauge measurement range, only a well-defined area located on both the bearing surface and the edge surface can be measured. The roundness traces are used to reconstruct a surface map that is analyzed based on a newly developed methodology. Both methods have been evaluated using ceramic liners tested in vitro under edge loading conditions, and the volume loss is compared to gravimetric measurements. The results show that both methods have the required resolution to measure volume loss of less than 1 mm3 and are thus capable of providing a volume loss estimation for ceramic acetabular cups.",
keywords = "Acetabular Cup, Bearing Surface, Ceramic-On-Ceramic Cup, Coordinate Measuring Machine, Edge Wear, Out of Roundness Measuring Machine, Rim Geometry, Volume Loss",
author = "Darshil Kapadia and Radu Racasan and Luca Pagani and Mazen Al-Hajjar and Paul Bills",
year = "2018",
month = "6",
day = "30",
doi = "10.1520/STP160620170097",
language = "English",
isbn = "9780803176577",
volume = "STP 1606",
pages = "156--172",
editor = "Mihalko, {William M.} and Lemons, {Jack E.} and Greenwald, {A. Seth} and Kurtz, {Steven M.}",
booktitle = "Beyond the Implant",
publisher = "ASTM International",

}

Kapadia, D, Racasan, R, Pagani, L, Al-Hajjar, M & Bills, P 2018, Methods for Characterization of Edge Wear in Ceramic-On-Ceramic Acetabular Cups. in WM Mihalko, JE Lemons, AS Greenwald & SM Kurtz (eds), Beyond the Implant: Retrieval Analysis Methods for Implant Surveillance. vol. STP 1606, ASTM International, pp. 156-172. https://doi.org/10.1520/STP160620170097

Methods for Characterization of Edge Wear in Ceramic-On-Ceramic Acetabular Cups. / Kapadia, Darshil; Racasan, Radu; Pagani, Luca; Al-Hajjar, Mazen; Bills, Paul.

Beyond the Implant: Retrieval Analysis Methods for Implant Surveillance. ed. / William M. Mihalko; Jack E. Lemons; A. Seth Greenwald; Steven M. Kurtz. Vol. STP 1606 ASTM International, 2018. p. 156-172.

Research output: Chapter in Book/Report/Conference proceedingChapter

TY - CHAP

T1 - Methods for Characterization of Edge Wear in Ceramic-On-Ceramic Acetabular Cups

AU - Kapadia, Darshil

AU - Racasan, Radu

AU - Pagani, Luca

AU - Al-Hajjar, Mazen

AU - Bills, Paul

PY - 2018/6/30

Y1 - 2018/6/30

N2 - Current methodologies for assessing wear on acetabular cups have focused on quantifying the amount of material loss on the bearing surface. The bearing surface is constituted by well-defined geometry and surface characteristics. As such, methods are able to estimate the unworn surface and determine the amount of material loss. When edge wear is present at the boundary between the bearing surface and outer cup geometry, it is normally thresholded during the analysis process. This can potentially underestimate the amount of wear present on acetabular cups. This paper details the requirements and methodologies for measurement and analysis of edge wear and focuses on ceramic liners. Two methodologies have been developed based on measurements using a coordinate measuring machine and a roundness measuring machine. The entire bearing surface as well as the edge geometry can be scanned using a coordinate measuring machine. A new analysis methodology has been developed to recreate the edge geometry using segmentation and identification of unworn areas. Based on the reconstructed surface, a wear map is produced and the volume of wear is quantified. The second method, based on the roundness measuring machine, is capable of nanometer-scale resolution point measurement for a defined measurement range. Because of the 2-mm limitation in the gauge measurement range, only a well-defined area located on both the bearing surface and the edge surface can be measured. The roundness traces are used to reconstruct a surface map that is analyzed based on a newly developed methodology. Both methods have been evaluated using ceramic liners tested in vitro under edge loading conditions, and the volume loss is compared to gravimetric measurements. The results show that both methods have the required resolution to measure volume loss of less than 1 mm3 and are thus capable of providing a volume loss estimation for ceramic acetabular cups.

AB - Current methodologies for assessing wear on acetabular cups have focused on quantifying the amount of material loss on the bearing surface. The bearing surface is constituted by well-defined geometry and surface characteristics. As such, methods are able to estimate the unworn surface and determine the amount of material loss. When edge wear is present at the boundary between the bearing surface and outer cup geometry, it is normally thresholded during the analysis process. This can potentially underestimate the amount of wear present on acetabular cups. This paper details the requirements and methodologies for measurement and analysis of edge wear and focuses on ceramic liners. Two methodologies have been developed based on measurements using a coordinate measuring machine and a roundness measuring machine. The entire bearing surface as well as the edge geometry can be scanned using a coordinate measuring machine. A new analysis methodology has been developed to recreate the edge geometry using segmentation and identification of unworn areas. Based on the reconstructed surface, a wear map is produced and the volume of wear is quantified. The second method, based on the roundness measuring machine, is capable of nanometer-scale resolution point measurement for a defined measurement range. Because of the 2-mm limitation in the gauge measurement range, only a well-defined area located on both the bearing surface and the edge surface can be measured. The roundness traces are used to reconstruct a surface map that is analyzed based on a newly developed methodology. Both methods have been evaluated using ceramic liners tested in vitro under edge loading conditions, and the volume loss is compared to gravimetric measurements. The results show that both methods have the required resolution to measure volume loss of less than 1 mm3 and are thus capable of providing a volume loss estimation for ceramic acetabular cups.

KW - Acetabular Cup

KW - Bearing Surface

KW - Ceramic-On-Ceramic Cup

KW - Coordinate Measuring Machine

KW - Edge Wear

KW - Out of Roundness Measuring Machine

KW - Rim Geometry

KW - Volume Loss

UR - http://www.scopus.com/inward/record.url?scp=85053804679&partnerID=8YFLogxK

U2 - 10.1520/STP160620170097

DO - 10.1520/STP160620170097

M3 - Chapter

SN - 9780803176577

VL - STP 1606

SP - 156

EP - 172

BT - Beyond the Implant

A2 - Mihalko, William M.

A2 - Lemons, Jack E.

A2 - Greenwald, A. Seth

A2 - Kurtz, Steven M.

PB - ASTM International

ER -

Kapadia D, Racasan R, Pagani L, Al-Hajjar M, Bills P. Methods for Characterization of Edge Wear in Ceramic-On-Ceramic Acetabular Cups. In Mihalko WM, Lemons JE, Greenwald AS, Kurtz SM, editors, Beyond the Implant: Retrieval Analysis Methods for Implant Surveillance. Vol. STP 1606. ASTM International. 2018. p. 156-172 https://doi.org/10.1520/STP160620170097