>Human cartilage samples taken from knee replacement surgeries also responded positively. These samples included both the supportive extracellular matrix of the joint and cartilage-producing chondrocyte cells. When treated, the tissue began forming new, functional cartilage.

Once again, not in humans, in mice. We don't know if the same result happens in humans. At all. We need to proceed to clinical trials to determine if a result is indeed positive.