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Hip dGEMRIC in asymptomatic volunteers and patients with early osteoarthritis: the influence of timing after contrast injection.

Tiderius CJ, Jessel R, Kim YJ, Burstein D

Department of Radiology, Beth Israel Deaconess Medical Center, Boston, Massachusetts 02115, USA. dburstei@bidmc.harvard.edu

Eight asymptomatic volunteers and 10 patients with early hip osteoarthritis (OA) were investigated with hip delayed gadolinium-enhanced MRI of cartilage (dGEMRIC) at 30, 65, 100, and 135 min after IV injection with Gd-DTPA(2-). In asymptomatic volunteers there was a decrease in the dGEMRIC index (T(1)(Gd)) between 30 and 100 min. In patients the wash-in of Gd-DTPA(2-) was faster, with a low T(1)(Gd) at 30 min that did not change significantly over time. Therefore, earlier time points showed a larger separation in T(1)(Gd) between asymptomatic and OA hips, with more convenient timing logistics. However, T(1)(Gd) at 30 min had a larger standard deviation (SD) in the OA group, possibly due to variability of the steep slope of wash-in. This sensitivity to the imaging window may be less desirable for longitudinal studies in which reproducibility is a concern. At all time points, T(1)(Gd) was 20-30% lower in patients than in asymptomatic volunteers (P < 0.003), which demonstrates the sensitivity of dGEMRIC to early hip OA.

Published 2 April 2007 in Magn Reson Med, 57(4): 803-5.
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