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Sodium MRI gives new insights into detecting osteoarthritis, NYU researchers find
Date:8/27/2010

Researchers at New York University have developed an innovative way to look at the development of osteoarthritis in the knee jointone that relies on the examination of sodium ions in cartilage. Their work, which appears in the Journal of Magnetic Resonance, may provide a non-invasive method to diagnose osteoarthritis in its very early stages.

The concentration of sodium ions, which are distributed in the body, is known to reveal the location of glycosaminogycans (GAGs) in cartilage tissues. GAGs are molecules that serve as the building blocks of cartilage and are involved in numerous vital functions in the human body. Mapping the GAG concentration is necessary for the diagnosis and monitoring of a number of diseases as well as to determine the efficacy of drug therapies. For instance, GAG loss in cartilage typically marks the onset of osteoarthritis and inter-vertebral disc degeneration.

However, the existing techniques for GAG monitoringbased on traditional magnetic resonance imaging (MRI)have limitations: they cannot directly map GAG concentrations or they require the administration of contrast agents to reveal the location of these concentrations.

But since sodium ions are already present in cartilage, researchers have sought to measure these ions using special MRI techniques that are non-invasive.

Such a methodology was previously developed at the University of Pennsylvania and Stanford University. However, these methodologies were not able to isolate ions in different parts of the knee area. Specifically, they could not make clear-cut distinctions between signals of slow motion sodium ions in the cartilage from those of free sodium ions in synovial fluid and joint effusion in the knee joint.

The NYU research team sought to improve on this method by focusing on the differences in the properties of sodium ions in the two environments.

Since sodium is present not only in cartilage, MRI ima
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Contact: James Devitt
james.devitt@nyu.edu
212-998-6808
New York University
Source:Eurekalert

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