Determination of Reference Geometry for Polyethylene Tibial Insert Wear Analysis

Geometric wear analysis techniques require unworn geometries to serve as a reference in wear measurement. A method to create a reference geometrical model is described for retrieval studies when the actual unworn geometry is unavailable. Never-implanted tibial inserts were scanned with micro–compute...

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Bibliographic Details
Published in:The Journal of arthroplasty Vol. 26; no. 3; pp. 497 - 503
Main Authors: Teeter, Matthew G., Naudie, Douglas D.R., Milner, Jaques S., Holdsworth, David W.
Format: Journal Article
Language:English
Published: United States Elsevier Inc 01.04.2011
Subjects:
Arthroplasty, Replacement, Knee - instrumentation
Equipment Failure Analysis
Humans
Knee Prosthesis
Materials Testing - methods
micro–computed tomography
Models, Theoretical
Orthopedics
Polyethylene
polyethylene wear
Prosthesis Design
Reference Values
retrieval studies
Tibia
Tomography, X-Ray Computed
total knee arthroplasty
wear analysis
micro–computed tomography
total knee arthroplasty
wear analysis
retrieval studies
polyethylene wear
ISSN:0883-5403, 1532-8406, 1532-8406
Online Access:Get full text
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Summary:Geometric wear analysis techniques require unworn geometries to serve as a reference in wear measurement. A method to create a reference geometrical model is described for retrieval studies when the actual unworn geometry is unavailable. Never-implanted tibial inserts were scanned with micro–computed tomography. Two, 3, or 6 insert surfaces were coaligned and averaged to create reference geometries. Individual inserts were compared with each other (manufacturing variability) and with the reference geometries (reference variability). The 3-dimensional deviations between the surfaces were recorded. The reference variability was reduced to 8.3 ± 39 μm, vs manufacturing variability of 15 ± 59 μm. Deviations were smallest on the articular surfaces where most wear occurs and were significantly less than the reported insert wear rate of 20 μm/y.
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ISSN:0883-5403
1532-8406
1532-8406
DOI:10.1016/j.arth.2010.01.096