Changes in three-dimensional and thermal measurements after intra-articular steroid injection. A 9-year-old female with polyarticular juvenile idiopathic arthritis underwent imaging before and 5 days after an intra-articular steroid injection of the left wrist. (a) Pre- and post-injection wrist region of interest and volume with dorsal (solid white arrow) and lateral (dashed white arrow) swelling evident in the pre-injection image. (b) Pre- and post-injection surface distance color map demonstrating pre-injection swelling (solid arrows) that resolves post-injection (dashed arrows). (c) Pre- and post-injection thermograms and heat distribution index (HDI). (d) Pre- and post-injection relative frequency distributions of temperatures. SDI, surface distribution index.
Spalding et al. Arthritis Research & Therapy 2008 10:R10 doi:10.1186/ar2360