copy-pasted from this website
X-rays provide a window inside the body, but they are most often static images that don’t depict movement. However, Cameron Drake of San Francisco has created a collection of magnificent images showing joints in motion. He was aided by orthopedic physician Dr. Noah Weiss and the finished product is completely amazing. If you’d like to know more about the project, please check out Drake’s blog. Dr. Weiss also has a blog to feature these awesome images. Hereafter you can appreciate the knee joint motion, but at the webpages linked above it is also possible to see the shoulder, the elbow, the wrist-hand and the ankle-foot joints.