An investigation of the stress distribution generated in articular cartilage by crystal aggregates of varying material properties

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Abstract

Several joint diseases are associated with the deposition of crystals within the articular cartilage. A variety of crystal aggregates have previously been identified throughout the thickness of the cartilage. A linear elastic finite element model representing instantaneous, or short-term, loading conditions has been developed of a large crystal aggregate surrounded by articular cartilage. The material properties of the aggregate and the cartilage were varied and the resultant shear stress and equivalent strain distribution in the surrounding cartilage studied in order to provide some indication of the relative potential of various types of crystal aggregate to cause damage to the articular cartilage. Results indicated that aggregates with a Young's modulus either much less, or much greater, than that of the surrounding cartilage generated the maximum shear stress and equivalent strain concentrations at the interface between the aggregate and the cartilage. Also, that highly compressible aggregates, with a very low Poisson's ratio, generated higher shear stress and equivalent strain concentrations in the surrounding cartilage than aggregates of a more incompressible nature. Under conditions of short-term loading these results suggest that crystal aggregates present within the cartilage layer will increase the shear stress and equivalent strain concentrations in the surrounding cartilage, and therefore have the potential to cause damage to the cartilage
Original languageEnglish
Pages (from-to)242-252
Number of pages11
JournalMedical Engineering & Physics
Volume19
Issue number3
DOIs
Publication statusPublished - 1997

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Cartilage
Articular Cartilage
Stress concentration
Materials properties
Crystals
Shear stress
Joint Diseases
Elastic Modulus
Poisson ratio
Elastic moduli

Cite this

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title = "An investigation of the stress distribution generated in articular cartilage by crystal aggregates of varying material properties",
abstract = "Several joint diseases are associated with the deposition of crystals within the articular cartilage. A variety of crystal aggregates have previously been identified throughout the thickness of the cartilage. A linear elastic finite element model representing instantaneous, or short-term, loading conditions has been developed of a large crystal aggregate surrounded by articular cartilage. The material properties of the aggregate and the cartilage were varied and the resultant shear stress and equivalent strain distribution in the surrounding cartilage studied in order to provide some indication of the relative potential of various types of crystal aggregate to cause damage to the articular cartilage. Results indicated that aggregates with a Young's modulus either much less, or much greater, than that of the surrounding cartilage generated the maximum shear stress and equivalent strain concentrations at the interface between the aggregate and the cartilage. Also, that highly compressible aggregates, with a very low Poisson's ratio, generated higher shear stress and equivalent strain concentrations in the surrounding cartilage than aggregates of a more incompressible nature. Under conditions of short-term loading these results suggest that crystal aggregates present within the cartilage layer will increase the shear stress and equivalent strain concentrations in the surrounding cartilage, and therefore have the potential to cause damage to the cartilage",
author = "A Hayes and Clift, {Sally E} and Miles, {Anthony W}",
year = "1997",
doi = "10.1016/S1350-4533(96)00072-0",
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TY - JOUR

T1 - An investigation of the stress distribution generated in articular cartilage by crystal aggregates of varying material properties

AU - Hayes, A

AU - Clift, Sally E

AU - Miles, Anthony W

PY - 1997

Y1 - 1997

N2 - Several joint diseases are associated with the deposition of crystals within the articular cartilage. A variety of crystal aggregates have previously been identified throughout the thickness of the cartilage. A linear elastic finite element model representing instantaneous, or short-term, loading conditions has been developed of a large crystal aggregate surrounded by articular cartilage. The material properties of the aggregate and the cartilage were varied and the resultant shear stress and equivalent strain distribution in the surrounding cartilage studied in order to provide some indication of the relative potential of various types of crystal aggregate to cause damage to the articular cartilage. Results indicated that aggregates with a Young's modulus either much less, or much greater, than that of the surrounding cartilage generated the maximum shear stress and equivalent strain concentrations at the interface between the aggregate and the cartilage. Also, that highly compressible aggregates, with a very low Poisson's ratio, generated higher shear stress and equivalent strain concentrations in the surrounding cartilage than aggregates of a more incompressible nature. Under conditions of short-term loading these results suggest that crystal aggregates present within the cartilage layer will increase the shear stress and equivalent strain concentrations in the surrounding cartilage, and therefore have the potential to cause damage to the cartilage

AB - Several joint diseases are associated with the deposition of crystals within the articular cartilage. A variety of crystal aggregates have previously been identified throughout the thickness of the cartilage. A linear elastic finite element model representing instantaneous, or short-term, loading conditions has been developed of a large crystal aggregate surrounded by articular cartilage. The material properties of the aggregate and the cartilage were varied and the resultant shear stress and equivalent strain distribution in the surrounding cartilage studied in order to provide some indication of the relative potential of various types of crystal aggregate to cause damage to the articular cartilage. Results indicated that aggregates with a Young's modulus either much less, or much greater, than that of the surrounding cartilage generated the maximum shear stress and equivalent strain concentrations at the interface between the aggregate and the cartilage. Also, that highly compressible aggregates, with a very low Poisson's ratio, generated higher shear stress and equivalent strain concentrations in the surrounding cartilage than aggregates of a more incompressible nature. Under conditions of short-term loading these results suggest that crystal aggregates present within the cartilage layer will increase the shear stress and equivalent strain concentrations in the surrounding cartilage, and therefore have the potential to cause damage to the cartilage

UR - http://dx.doi.org/10.1016/S1350-4533(96)00072-0

U2 - 10.1016/S1350-4533(96)00072-0

DO - 10.1016/S1350-4533(96)00072-0

M3 - Article

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EP - 252

JO - Medical Engineering & Physics

JF - Medical Engineering & Physics

SN - 1350-4533

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