The histological or biomechanics method could not be
used for comparing fracture healing of distal radius in clinical trials.
The grey levels of the fracture site were corrected to eliminate error
coming from different conditions of taking the X-ray film. The
grey level of X-ray film could indirectly reflect the changes of bone
mineral density. Thus, we could compare the grey level of X-ray
film to assess bone mineral density of fracture site in this study. The
result indicated that the bone mineral density in the ultrasound group
was statistically higher than that in the control group (p