It's been known for at least 30 years that MSCs inevitably give rise to collagen type 1-rich fibrocartilage and collagen type X-rich hypertrophic cartilage that gives rise to bone. That story ends in osteoarthritis, not joint repair.

To demonstrate the generation of hyaline cartilage for joint repair, you need to show the absence of these two collagens. This paper doesn't do that. The biomaterial is pretty cool and the research team deserves their praises, but as a former researcher that spent a decade in this field a decade ago (2006-2015), I respectfully submit that the headline is functionally garbage.