Newly identified mechanism may allow aging joints to be restored. A protein called fifteen PGDH increases with age and blocks cartilage repair. Contributing to osteoarthritis. In a study conducted by researchers at Stanford University. Scientists found that blocking this protein in older mice allowed damaged cartilage to regenerate and become more like healthy tissue. This process did not require stem cells. Existing cartilage cells shifted into a more active repair state. Improved movement and reduced pain were observed along with similar regenerative effects in human tissue samples. The findings suggest a shift from managing symptoms to directly reversing joint damage. This approach could lead to future treatments that restore joint function and reduce the need for joint replacement surgeries.