“…In the triangle of tissue engineering, in addition to having a suitable cell source and an ideal scaffold, culture medium has an important consequence on tissue regeneration, especially in inducing cellular differentiation (Sheykhhasan, Qomi, Kalhor, Mehdizadeh, & Ghiasi, ). Previous studies in cartilage regeneration have shown that chondro‐inductive factors such as fibroblast growth factor‐2 (Hildner et al, ; Ito, Sawada, Fujiwara, & Tsuchiya, ), insulin‐like growth factor‐1 (Jaklenec et al, ), platelet‐derived growth factor (PDGF; Kang et al, ; Ng et al, ), bone morphogenetic protein‐6 (BMP‐6; Cheng, Gustafson, Tooley, & Zhang, ; Shademan, Parham, & Dehghani, ), and transforming growth factor beta‐3 (TGF‐β3; Almeida et al, ; Shademan et al, ) play an important role in differentiation of MSCs into chondrocytes. Alpha granules present in platelet‐rich plasma (PRP), containing high amounts of TGF‐β3 and other growth factors, are widely used to treat osteoarthritis (Okuda et al, ).…”