Werning did histologic studies of the six-foot-long specimen and found that the animal was not even one-year old when it died. Sarah reported that "Dinosaurs have yearly growth rings in their bone tissue, like trees. But we didn't see even one ring. That means it grew to a quarter of adult size [25 feet] in less than a year."
Three-dimensional scans of the entire skeleton were made and are freely accessible online. See the paper, along with the 3D scans, in the open-access journal PeerJ. Co-authors on the paper are Andrew Farke of the Raymond M. Alf Museum of Paleontology, Claremont, California, and Webb students Derek Chok, Annisa Herrero, and Brandon Scolieri.
Read more about "Joe" and see photos and video relating to the recovery, preparation, and study of the specimen.
Read more about Sarah's research on her website.