Fig.3 Anteroposterior radiographs of the spinal segment of the platelet-rich plasma group 4 weeks after surgery^［16］.

(a) Sham group

(b) Artificial bone－alone group

(c) Autologous bone group

(d) Artificial bone＋FD-PRP group

(e) Artificial bone＋BMP group

FD-PRP and BMP groups showed greater bone formation compared with the autologous bone group.