The functional improvement did not correlate with scar tissue formation. We found that injection of BMMC in crunched muscles did not decrease the amount of fibrosis and scar formation at the re-injured site ( Table 1 and Fig 2 ). Despite its high regeneration capacity, muscle lesion always leads to extracellular matrix expansion, collagen deposition and formation of a fibrotic scar. This process is strictly related to the level of muscle contusion. Moreover, successive injuries would exacerbate scar formation. In this context, both mononuclear and mesenchymal cells form bone marrow did not reverse liver fibrosis [ 28 , 36 ] and cells from adipose tissue were not capable of decreasing fibrosis in SKM laceration model [ 13 ]. Accordingly, antifibrotic therapy has been tested after muscle injury [ 35 , 37 – 44 ] and was able to improve cell-based therapies [ 45 – 47 ].