A study published on October 1, 2026, in Science by researchers from Chonnam National University in South Korea suggests a new connection between high blood pressure and the breakdown of cartilage in joints. This research challenges the widely held belief that osteoarthritis—commonly known as wear-and-tear arthritis—is mainly caused by factors such as aging, obesity, and physical stress on the joints. Instead, the study proposes that high blood pressure may contribute to the condition through a specific hormonal pathway. The researchers identified vasopressin, a hormone that helps regulate blood pressure, as a key element in this process. People with hypertension tend to have higher levels of vasopressin, which needs a specific receptor called AVPR1A to function. Healthy cartilage has very little of this receptor, making it resistant to the effects of vasopressin. However, as people age or suffer joint injuries, the cartilage begins to produce more AVPR1A. This allows vasopressin to bind to the receptor and start a chain of chemical reactions that break down the cartilage. The study analyzed data from 36,820 people aged 45 and older and found a strong link between high blood pressure and osteoarthritis, especially among women and those with more severe knee damage. While this connection is based on correlations rather than direct causation, the researchers tested their findings in mice. Hypertensive mice that had knee injuries showed significantly more cartilage loss compared to mice with normal blood pressure. However, high blood pressure alone did not cause damage to healthy joints. Mice that lacked the AVPR1A receptor or were given a substance that blocks it showed less cartilage damage, suggesting that targeting this receptor might help treat osteoarthritis. The researchers noted that drugs already designed to affect vasopressin receptors could be repurposed for this purpose. However, more long-term studies in humans are needed before these findings can be applied to patients. Osteoarthritis affects nearly 600 million people worldwide and is a major cause of disability in older adults, with few effective treatments currently available.