“…Among the 18 studies, 7 were case reports [6 in humans (Jancewicz et al, 2004;Saw et al, 2011;Skowroński et al, 2012;Turajane et al, 2013;Fu et al, 2014a;Saw et al, 2015) and 1 in horses (Spaas et al, 2012)], 1 was a human comparative study (Skowroński and Rutka, 2013), 1 was a human randomized controlled trial (RCT) (Saw et al, 2013), 1 was a preliminary study (in horses) (Broeckx et al, 2014a), 1 was a pilot study (in horses) (Broeckx et al, 2014b), 4 involved animal models [rabbits (Fu et al, 2014b), sheep (Hopper et al, 2015b), rats (Deng et al, 2015), and pigs (Zhao et al, 2018), 1 was a prospective placebocontrolled study (in dog) (Daems et al, 2019), and 2 were randomized, double-blinded, placebo-controlled proof-ofconcept study (in horses) (Broeckx et al, 2019a;Broeckx et al, 2019b) (Table 1). (Jancewicz et al, 2004) Human 9Case report N/A N/A Osteochondral defects Talus 0.5×0.7 cm with 0.5-1.0 cm depth ICRS IV (Skowroński et al, 2012 The age of the patients ranged from 7 to 59 years in the 8 human studies (Jancewicz et al, 2004;Saw et al, 2011;Skowroński et al, 2012;Saw et al, 2013;Skowroński and Rutka, 2013;Turajane et al, 2013;Fu et al, 2014a;Saw et al, 2015). Lesions were mainly located in the tibial plateaus (Saw et al, 2011;Saw et al, 2013), patella (Saw et al, 2011;Skowroński et al, 2012;Saw et al, 2013), femoral condyles…”