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All of the stem cell therapies are scams.  While there's been great progress in taking adult cells and converting them to pluripotent stem cells, there's huge problems on the delivery side of things.  Once injected in the body, there is no way to guide the differentiation of the stem cells.  You want them to become chondrocytes, but there's nothing that's going to signal the stem cells to differentiate into chondrocytes.  Most of the stem cells just end up dying.  Even if researchers solve the differentiation problem, there is a secondary and much bigger problem.  Once injected into the body, the stem cells don't stay where they are injected.  They can migrate to anywhere.  Right now this isn't a problem because they don't differentiate.  But if you can signal them to differentiate into chondrocytes, then you get the problem of chondrocytes in places you don't want them, like in heart tissue.  I'm pretty pessimistic that stem cells will ever be a viable therapy for any condition.