Treatment of Refractory Patellar Tendinopathy With Mesenquimal Trunk Cells. Comparative Study With PRP.

This is a clinical trial, unicentric, prospective, controlled, randomized, double blind during the experimental phase A. In the experimental phase B, it is contemplated to administer the experimental treatment to the subjects included in the group treated with P-PRP in the event that the first treatment would be significantly more effective, both from a clinical and regenerative point of view