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Spin-lattice relaxation rates and water content of freeze-dried articular cartilage

Damion, R. A.; Pawaskar, S. S.; Ries, M. E.; Ingham, E.; Williams, S.; Jin, Z.; Radjenovic, A.


S. S. Pawaskar

M. E. Ries

E. Ingham

S. Williams

Z. Jin

A. Radjenovic


Objective: Nuclear magnetic resonance (NMR) spin-lattice relaxation rates were measured in bovine and porcine articular cartilage as a function of water content. Methods: Water content was varied by freeze-drying samples for short periods of time (up to 15. min). The samples were weighed at all stages of drying so that water content could be quantified. Spin-lattice relaxation rates were measured using magnetic resonance imaging (MRI). Results: Linear correlations were observed between relaxation rate and two measures of inverse water content: (1) solid-to-water ratio (ρ), expressed as a ratio of the mass of the solid component of the cartilage (m s) and the mass of water at each freeze-drying time point (m w), and (2) a ratio of the total mass of the fully-hydrated cartilage and m w (1/w). These correlations did not appear significantly different for the bovine and porcine data. However, fitting the data to a piecewise-linear model revealed differences between these two species. We interpret the first two segments of the piecewise model as the depletion of different water phases but conjecture that the third segment is partially caused by changes in relaxation rates as a result of a reduction in macromolecular mobilities. Conclusions: Whilst we can produce linear correlations which broadly describe the dependence of the measured spin-lattice relaxation rate on (inverse) water content, the linear model seems to obscure a more complicated relationship which potentially provides us with more information about the structure of articular cartilage and its extracellular water. © 2012 Osteoarthritis Research Society International.


Damion, R. A., Pawaskar, S. S., Ries, M. E., Ingham, E., Williams, S., Jin, Z., & Radjenovic, A. (2012). Spin-lattice relaxation rates and water content of freeze-dried articular cartilage. Osteoarthritis and Cartilage, 20(2), 184-190.

Journal Article Type Article
Acceptance Date Dec 12, 2011
Online Publication Date Jan 3, 2012
Publication Date Feb 1, 2012
Deposit Date Dec 5, 2022
Journal Osteoarthritis and Cartilage
Print ISSN 1063-4584
Electronic ISSN 1522-9653
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 20
Issue 2
Pages 184-190
Public URL
Publisher URL
Additional Information Open archive on publisher website