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Introduction Cartilage thickness and volume ◦ characterize normal joints ◦ delineate joint degenerative disease Compute cartilage thickness and volume from high-resolution joint geometry scans ◦ three distinct algorithms 3
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ESTIMATION OF CARTILAGE ESTIMATION OF CARTILAGE THICKNESS FROM JOINT THICKNESS FROM JOINT SURFACE SCANS:SURFACE SCANS:COMPARATIVE ANALYSIS OF COMPARATIVE ANALYSIS OF COMPUTATIONAL METHODSCOMPUTATIONAL METHODS
Author :Frank Heuer, Mark Sommers, John B. Reid III, Michael BottlangSource :BED-Vol. 50, 2001 Bioengineering Conference
ASME 2001Speaker : Ren-LI ShenAdvisor : Ku-Yaw Chang
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OutlineOutlineIntroductionMaterials and methodsResultDiscussion
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IntroductionIntroductionCartilage thickness and volume
◦characterize normal joints◦delineate joint degenerative disease
Compute cartilage thickness and volume from high-resolution joint geometry scans◦three distinct algorithms
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OutlineOutlineIntroductionMaterials and methodsResultDiscussion
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Materials and methodsMaterials and methodsJoint of a human cadaveric talus
◦obtained a laser displacement sensor◦scanning of a 31-mm x 34-mm
region of interest◦over 40,000 digitized surface points
Talar joint surface ◦intact articular cartilage (Atc)◦subchondral bone surface (Atb)
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Materials and methodsMaterials and methods
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Materials and methodsMaterials and methodsUse PV-Wave to compute cartilage
thickness from Atc and Atb in three distinct approaches◦a) vertical distance◦b) proximity method◦c) normal distance
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Materials and methodsMaterials and methodsIn addition to quantifying variances
◦closest approximation of the true cartilage thickness utilized a cylindrical object with two specific
radii 25.52-mm on one side 27.46-mm on the other
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Materials and methodsMaterials and methods
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Materials and methodsMaterials and methodsDefined thickness T=1.94-mm
◦idealized constant cartilage thickness distribution
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OutlineOutlineIntroductionMaterials and methodsResultDiscussion
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ResultResult
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Cartilage thickness variances◦depicted as a grey-scale image
ResultResult
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ResultResult
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OutlineOutlineIntroductionMaterials and methodsResultDiscussion
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DiscussionDiscussionThe other two methods
◦based on magnetic resonance imaging
◦based on stereophotogrammetry
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EndEnd
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