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Imaging of proteoglycan and water contents in human articular cartilage with full‐body CT using dual contrast technique
Author(s) -
Honkanen Miitu K. M.,
Matikka Hanna,
Honkanen Juuso T. J.,
Bhattarai Abhisek,
Grinstaff Mark W.,
Joukainen Antti,
Kröger Heikki,
Jurvelin Jukka S.,
Töyräs Juha
Publication year - 2019
Publication title -
journal of orthopaedic research®
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.041
H-Index - 155
eISSN - 1554-527X
pISSN - 0736-0266
DOI - 10.1002/jor.24256
Subject(s) - cartilage , osteoarthritis , proteoglycan , chemistry , articular cartilage , biomedical engineering , anatomy , medicine , pathology , alternative medicine
Assessment of cartilage composition via tomographic imaging is critical after cartilage injury to prevent post‐traumatic osteoarthritis. Diffusion of cationic contrast agents in cartilage is affected by proteoglycan loss and elevated water content. These changes have opposite effects on diffusion and, thereby, reduce the diagnostic accuracy of cationic agents. Here, we apply, for the first time, a clinical full‐body CT for dual contrast imaging of articular cartilage. We hypothesize that full‐body CT can simultaneously determine the diffusion and partitioning of cationic and non‐ionic contrast agents and that normalization of the cationic agent partition with that of the non‐ionic agent minimizes the effect of water content and tissue permeability, especially at early diffusion time points. Cylindrical ( d = 8 mm) human osteochondral samples ( n = 45; four cadavers) of a variable degenerative state were immersed in a mixture of cationic iodinated CA4+ and non‐charged gadoteridol contrast agents and imaged with a full‐body CT scanner at various time points. Determination of contrast agents’ distributions within cartilage was possible at all phases of diffusion. At early time points, gadoteridol, and CA4+ distributed throughout cartilage with lower concentrations in the deep cartilage. At ≥24 h, the gadoteridol concentration remained nearly constant, while the CA4+ concentration increased toward deep cartilage. Normalization of the CA4+ partition with that of gadoteridol significantly ( p < 0.05) enhanced correlation with proteoglycan content and Mankin score at the early time points. To conclude, the dual contrast technique was found advantageous over single contrast imaging enabling more sensitive diagnosis of cartilage degeneration. © 2019 The Authors. Journal of Orthopaedic Research Published by Wiley Periodicals, Inc. J Orthop Res 9999:1–12, 2019.