Fig. 1

Different steps of osteochondral allograft implantation combined with platelet-rich plasma (PRP) to treat osteochondritis dissecans of the knee. A debridement, spongialization, and reaming of the osteochondral wound bed was performed (a and b). Pridie-type microfractures followed by infiltration of liquid PRP into subchondral bone were carried out (c). PRP membrane was placed into the wound bed (d). Next, the femoral plug osteochondral allograft was infiltrated with liquid PRP (e) and press-fit into the reamed area, sealing the interface around the allograft with liquid PRP (f)