Fig. 4From: Autologous bone grafts with MSCs or FGF-2 accelerate bone union in large bone defectsCT images in each group at 12 weeks. In CT images, there was abundant callus formation around the junction of femur and bone graft in all groups; however, there was no bridging callus formation in group A or B. In contrast, complete bone union could be observed in group CBack to article page