Eight patients with chronic patellar tendinopathy were treated with bone marrow aspirate concentrate. At 5-year follow-up, statistically significant improvement was seen for most clinical scores. Seven of eight patients thought that the results of the procedure were excellent although control patients and radiological data were lacking  in this study (Pascual-Garrido et al., 2012). Further corroborating clinical studies on the stem cell treatment will need to confirm these positive results of stem cell application to treat tendinopathies.