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Contrast-enhanced CT using a cationic contrast agent enables non-destructive assessment of the biochemical and biomechanical properties of mouse tibial plateau cartilage

Citation

Lakin, BA and Patel, H and Holland, C and Freedman, JD and Shelofsky, JS and Snyder, BD and Stok, KS and Grinstaff, MW, Contrast-enhanced CT using a cationic contrast agent enables non-destructive assessment of the biochemical and biomechanical properties of mouse tibial plateau cartilage, Journal of Orthopaedic Research, 34, (7) pp. 1130-1138. ISSN 0736-0266 (2016) [Refereed Article]

Copyright Statement

Copyright 2015 Orthopaedic Research Society.

DOI: doi:10.1002/jor.23141

Abstract

Mouse models of osteoarthritis (OA) are commonly used to study the disease's pathogenesis and efficacy of potential treatments. However, measuring the biochemical and mechanical properties of articular cartilage in these models currently requires destructive and time‐consuming histology and mechanical testing. Therefore, we examined the feasibility of using contrast‐enhanced CT (CECT) to rapidly and non‐destructively image and assess the glycosaminoglycan (GAG) content. Using three ex vivo C57BL/6 mouse tibial plateaus, we determined the time required for the cationic contrast agent CA4+ to equilibrate in the cartilage. The whole‐joint coefficient of friction (μ) of 10 mouse knees (some digested with Chondroitenase ABC to introduce variation in GAG) was evaluated using a modified Stanton pendulum. For both the medial and lateral tibial plateau cartilage of these knees, linear regression was used to compare the equilibrium CECT attenuations to μ, as well as each side's indentation equilibrium modulus (E) and Safranin‐O determined GAG content. CA4+ equilibrated in the cartilage in 30.9  0.95 min (mean  SD, tau value of 6.17  0.19 min). The mean medial and lateral CECT attenuation was correlated with μ (R2 = 0.69, p < 0.05), and the individual medial and lateral CECT attenuations correlated with their respective GAG contents (R2 ≥ 0.63, p < 0.05) and E (R2 ≥ 0.63, p < 0.05). In conclusion, CECT using CA4+ is a simple, non‐destructive technique for three‐dimensional imaging of ex vivo mouse cartilage, and significant correlations between CECT attenuation and GAG, E, and μ are observed.

Item Details

Item Type:Refereed Article
Keywords:coefficient of friction, compressive modulus, glycosaminoglycan, micro-computed tomography, osteoarthritis
Research Division:Engineering
Research Group:Biomedical engineering
Research Field:Biomechanical engineering
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in engineering
UTAS Author:Stok, KS (Dr Kathryn Stok)
ID Code:133635
Year Published:2016
Web of Science® Times Cited:30
Deposited By:Menzies Institute for Medical Research
Deposited On:2019-07-04
Last Modified:2019-08-08
Downloads:0

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