Fig. 2

Formation of an immature bone in the control group (CG) (a hematoxylin and eosin (H&E) ×20 and b H&E ×40) and the ultrasound group (USG) (c H&E ×20 and d H&E ×40) was similar. The diameter of the newly formed bone tissue (asterisk) was greater and more evident in the USG