TY - JOUR
T1 - Dynamic biomechanics correlate with histopathology in human tibial cartilage
T2 - A preliminary study
AU - Young, Allan A.
AU - Appleyard, Richard C.
AU - Smith, Margaret M.
AU - Melrose, James
AU - Little, Christopher B.
PY - 2007/9
Y1 - 2007/9
N2 - Improved staging of cartilage degeneration is required, particularly during early stages when minimal surface damage is visible arthroscopically. Degradation of articular cartilage extracellular matrix, resulting from degenerative changes associated with osteoarthritis, can influence its functional properties. Cartilage mechanical properties therefore may provide a quantitative method for monitoring degenerative change in this tissue. We determined whether dynamic mechanical properties of cartilage (effective shear modulus and phase lag) measured with a handheld indenter correlated with histopathology scores, proteoglycan, and collagen content or expression of chondrocyte-specific (aggrecan, collagen II) or dedifferentiation (collagen I and III) genes in human osteoarthritic cartilage with International Cartilage Repair Society scores of 0 to 1. We observed an association between the histopathologic stage of cartilage disease and dynamic shear modulus and phase lag. In contrast, there generally was a poor relationship between cartilage biomechanical properties and biochemistry with the only noteworthy correlation being between shear modulus and collagen. Phase lag but not shear modulus correlated with gene expression. These data support the potential of dynamic indentation for assessing the stage of cartilage degeneration in tissue with minimal gross surface damage.
AB - Improved staging of cartilage degeneration is required, particularly during early stages when minimal surface damage is visible arthroscopically. Degradation of articular cartilage extracellular matrix, resulting from degenerative changes associated with osteoarthritis, can influence its functional properties. Cartilage mechanical properties therefore may provide a quantitative method for monitoring degenerative change in this tissue. We determined whether dynamic mechanical properties of cartilage (effective shear modulus and phase lag) measured with a handheld indenter correlated with histopathology scores, proteoglycan, and collagen content or expression of chondrocyte-specific (aggrecan, collagen II) or dedifferentiation (collagen I and III) genes in human osteoarthritic cartilage with International Cartilage Repair Society scores of 0 to 1. We observed an association between the histopathologic stage of cartilage disease and dynamic shear modulus and phase lag. In contrast, there generally was a poor relationship between cartilage biomechanical properties and biochemistry with the only noteworthy correlation being between shear modulus and collagen. Phase lag but not shear modulus correlated with gene expression. These data support the potential of dynamic indentation for assessing the stage of cartilage degeneration in tissue with minimal gross surface damage.
UR - http://www.scopus.com/inward/record.url?scp=34548453145&partnerID=8YFLogxK
U2 - 10.1097/BLO.0b013e318076b431
DO - 10.1097/BLO.0b013e318076b431
M3 - Article
C2 - 17496559
AN - SCOPUS:34548453145
SN - 0009-921X
SP - 212
EP - 220
JO - Clinical Orthopaedics and Related Research
JF - Clinical Orthopaedics and Related Research
IS - 462
ER -