Surface extraction can provide a reference for micro-CT analysis of retrieved total knee implants

Quantitative measurements of damage and wear in orthopaedic components retrieved from patients during revision surgery can provide valuable information. However, to perform these measurements there needs to be an estimate of the original, unworn geometry of the component, often requiring multiple sc...

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Veröffentlicht in:The knee Jg. 21; H. 4; S. 801 - 805
Hauptverfasser: Teeter, Matthew G., Milner, Jaques S., Naudie, Douglas D.R., MacDonald, Steven J.
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Netherlands Elsevier B.V 01.08.2014
Elsevier Limited
Schlagworte:
Algorithms
Device Removal
Geometry
Humans
Knee Prosthesis
Manufacturers
Manufacturing
Medical research
Methods
Micro-computed tomography
Orthopedics
Polyethylene
Polyethylene wear
Principal components analysis
Prosthesis Design
Retrieval analysis
Software utilities
Studies
Total knee arthroplasty
X-Ray Microtomography
Retrieval analysis
Total knee arthroplasty
Polyethylene wear
Micro-computed tomography
ISSN:0968-0160, 1873-5800, 1873-5800
Online-Zugang:Volltext
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Zusammenfassung:Quantitative measurements of damage and wear in orthopaedic components retrieved from patients during revision surgery can provide valuable information. However, to perform these measurements there needs to be an estimate of the original, unworn geometry of the component, often requiring multiple scans of the various sizes of components that have been retrieved. The objective of this study was to determine whether the articular and backside surfaces could be independently segmented from a micro-CT reconstruction of a tibial insert, such that a tibial insert of one thickness could be used as a reference for a tibial insert of a different thickness. New tibial inserts of a single width but with six different thicknesses were obtained and scanned with micro-CT. An automated method was developed to computationally segment the articular and backside surfaces of the components. Variability between intact and extracted components was determined. The deviations between the comparisons of the extracted surfaces (range, 0.0004 to 0.010mm) were less (p<0.001) than the baseline deviation between the intact surfaces (range, 0.0002 to 0.053mm). An extracted surface from one insert thickness could be used to accurately represent the surface of an insert of a different thickness. This greatly enhances the feasibility of performing retrieval studies using micro-CT as a quantitative tool, by reducing the costs and time associated with acquiring, scanning, and reconstructing multiple reference tibial insert geometries. This will add greater detail to studies of retrieved implants, to better establish how implants are functioning in vivo.
Bibliographie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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ISSN:0968-0160
1873-5800
1873-5800
DOI:10.1016/j.knee.2014.04.009