scholarly journals Viscoelastic properties of human and bovine articular cartilage: a comparison of frequency-dependent trends

2016 ◽  
Vol 17 (1) ◽  
Author(s):  
Duncan K. Temple ◽  
Anna A. Cederlund ◽  
Bernard M. Lawless ◽  
Richard M. Aspden ◽  
Daniel M. Espino
Keyword(s):  
Articular Cartilage ◽  
Viscoelastic Properties ◽  
Frequency Dependent ◽  
Bovine Articular Cartilage

Targeted Loss of Proteoglycans Results in Changes of Frequency-Dependent Viscoelastic Behavior of the Intact Articular Cartilage

2012 ◽  
Author(s):  
Simon Y. Tang ◽  
Tamara Alliston
Keyword(s):  
Articular Cartilage ◽  
Mechanical Behavior ◽  
Viscoelastic Behavior ◽  
Enzymatic Digestion ◽  
Cartilage Tissue ◽  
Indentation Modulus ◽  
Frequency Dependent ◽  
Bovine Articular Cartilage ◽  
Before And After ◽  
Tan Δ

Cartilage is a multi-phasic, viscoelastic material that derives its mechanical behavior of its primary constituents including collagen, proteoglycans, and water. The complex mechanical function of cartilage depends critically on the composition and balance of these constituents. We sought to determine the effects of proteoglycan loss on both the time- and frequency-dependent mechanical behavior of articular cartilage. Using cathepsin d, an enzyme that specifically cleaves proteoglycans, we assessed the in situ mechanical behavior of intact bovine articular cartilage before and after enzymatic digestion using microindentation over loading frequencies ranging between 0.5 hz to 20 hz. The loss of proteoglycans does not affect the elastic components of mechanical behavior (indentation modulus; p = 0.67), but have significant consequences on the viscoelastic components (tan δ; p<0.001). Moreover, the changes in the viscoelastic mechanical behavior are more pronounced at higher loading frequencies (p<0.001). Taken together, these results suggest that proteoglycans are critical for providing dynamic stability for the cartilage tissue.

FREQUENCY DEPENDENT VISCOELASTIC PROPERTIES OF KNEE ARTICULAR CARTILAGE

2012 ◽  
Vol 45 ◽  
pp. S158 ◽  
Author(s):  
Daniel M Espino ◽  
Duncan ET Shepherd ◽  
David WL Hukins
Keyword(s):  
Articular Cartilage ◽  
Viscoelastic Properties ◽  
Frequency Dependent

High Frequency Acoustic Parameters of Human and Bovine Articular Cartilage following Experimentally-Induced Matrix Degradation

2001 ◽  
Vol 23 (2) ◽  
pp. 106-116 ◽  
Author(s):  
G.A. Joiner ◽  
E.R. Bogoch ◽  
K.P. Pritzker ◽  
M.D. Buschmann ◽  
A. Chevrier ◽  
...  
Keyword(s):  
Articular Cartilage ◽  
Speed Of Sound ◽  
Chemical Degradation ◽  
Matrix Degradation ◽  
Frequency Dependent ◽  
Bovine Articular Cartilage ◽  
Paired Samples ◽  
The Matrix ◽  
Interleukin 1Α ◽  
Bovine Cartilage

Matrix degradation and proteoglycan loss in articular cartilag eare features of early osteoarthritis. To determine the effect of matrix degradation and proteoglycan loss on ultrasound propagation in cartilage, we used papain and interleukin-1α to degrade the matrix proteoglycans of human and bovine cartilage samples, respectively. There is also minor collagen alteration associated with these chemical degradation methods. We compared the speed of sound and frequency dependent attenuation (20–40 MHz) of control and experimental paired samples. We found that a loss of matrix proteoglycans and collagen disruption resulted in a 20–30% increase in the frequency dependent attenuation and a 2% decrease in the speed of sound in both human and bovine cartilage. We conclude that the frequency dependent attenuation and speed of sound in articular cartilage are sensitive to experimental modification of the matrix proteoglycans and collagen. These findings suggest that ultrasound can potentially be used to detect morphologic changes in articular cartilage associated with the progression of osteoarthritis.

A novel wave propagation method for measuring viscoelastic properties of pre-strained materials

2021 ◽  
pp. 1-19
Author(s):  
Pierre Lemerle
Keyword(s):  
Wave Propagation ◽  
Viscoelastic Properties ◽  
Time History ◽  
Main Concept ◽  
Frequency Dependent ◽  
Damping Characteristics ◽  
History Of ◽  
Propagation Methods ◽  
The Time Domain ◽  
Waveform Pattern

Abstract Viscoelastic materials are widely used for vibroacoustic solutions due to their ability to mitigate vibration and sound. Wave propagation methods are based on the measurement of the waveform pattern of a transitory pulse in one-dimensional structures. The time evolution of the pattern can be used to deduce the material elasticity and damping characteristics. The most popular propagation methods, namely Hopkinson bar methods, assume no dispersion, i.e. the complex elasticity modulus is not frequency-dependent. This is not significant for resilient materials such as elastomers. More recent approaches have been developed to measure frequency-dependent properties from a pulse propagating in a slender bar. We showed in previous works how to adapt these techniques for shorter samples of materials, representing a real advance, as extrusion is a cumbersome process for many materials. The main concept was to reconstruct the time history of the wave propagating in a composite structure composed of a long incident bar made of a known material and extended by a shorter sample bar. Then the viscoelastic properties of the sample material were determined in the frequency domain within an inverse method held in the time domain. In industry, most isolation solutions using mounts or bushings must support structural weights. This is why it is particularly interesting to know the viscoelastic properties of the material in stressed state. Here, we show how to overcome this challenging issue. The theoretical framework of the computational approach is detailed and the method is experimentally verified.

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