70.0 MB (10.3 MB compressed)
6060 x 4040 pixels
51.3 x 34.3 cm ⏐ 20.2 x 13.5 in (300dpi)
CAROL AND MIKE WERNER / SCIENCE PHOTO LIBRARY CAROL AND MIKE WERNER / SCIENCE PHOTO LIBRARY
Illustration comparing a normal knee joint (left) and arthritic knee joint (right). The disease commonly occurs between ages 7 to 12 and affects 1 in 1000 children each year. It is known as systemic juvenile idiopathic arthritis.
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