“…Ultrasonography is a non-invasive, inexpensive and portable technique, and thus it has been gradually used in the broad area of medicine. For the assessment of the skin, a 20 MHz probe is more widely used for the search and imaging of lymph nodes, chronic ulcers and subcutaneous tumors in a variety of clinical settings (Schmid-Wendtner & Burgdorf, 2005;Yabunaka et al, 2009). However, we focused on the subcutaneous tissue damage using a 10 MHz probe in this study, because it is known that the deep tissue damages precede skin breakdown when the callus is developed into the full thickness skin ulcer (Apelqvist et al, 2000;Apelqvist et al, 2008;Edmonds & Foster, 2006).…”