More than 650 million people worldwide are affected by osteoarthritis, and few treatment options exist. However, new promising results from an International Space Station (ISS) National Laboratory-sponsored experiment detail a tissue chip model that accurately reproduces the conditions under which post-traumatic osteoarthritis (PTOA) is initiated. Published in Frontiers in Space in March, these findings mark an important step forward in understanding and testing treatments for the underlying causes of osteoarthritis and related conditions.