“…However, one of the main challenges of in vitro hBM-MSC chondrogenic differentiation is the lack of a suitable culture environment that reproduces the in vivo physiological conditions and, in so doing, prevents or reduces the progression of MSC-derived chondrocytes through hypertrophic differentiation, www.ecmjournal.org G Monaco et al Role of HA and mechanical load on chondrogenesis exposed to HA contained within the synovial fluid (Kang et al, 2008;Oussedik et al, 2015;Steadman et al, 2001). Therefore, HA has been extensively used as target molecule for scaffold or hydrogel manufacturing, alone or in combination with MSCs, to reproduce engineered cartilage with native structure or to enhance the repair of osteochondral defects (Gallo et al, 2019;Huerta-Ángeles et al, 2018;Li et al, 2018;Radice et al, 2000;Solchaga et al, 2000). However, few studies have described the use of HA as an exogenous medium supplement to promote the chondrogenic differentiation of MSCs (Hegewald et al, 2004;Monaco et al, 2020).…”