The Osteoarthritis Research Society International (OARSI) held the 2017 OARSI World Congress in Las Vegas, April 27–30. Below, we report on two of the sessions held. Retinoic Acid & Hand Osteoarthritis Retinoic acid is a vitamin A derivative and hormonal signaling molecule with a role in cartilage and skeletal development. Retinoic acid has complex function,…