“…8 Over the years, different materials (such as metals, ceramics, glass, synthetic and natural polymers) have been used to produce scaffold. 9,10 Biodegradable polymers including poly(glycolic acid) (PGA), poly(lactic acid) (PLA), poly[lactic-co-(glycolic acid)] (PLGA), polyethylene glicol, chitosan, collagen, hyaluronic acid, and alginate have been widely used in the tissue engineering of cartilage, 11 bone, 12 skin, 13 ligament, and so forth. In order to produce the porous structure, the most common foaming techniques are based on salt leaching, gas foaming, phase separation, freeze-drying, electrospinning techniques.…”