Fig. 1

Method of measuring the proximal humerus average HU value. CT image of the patient with proximal humerus fracture(a). CT image of the same patient, the contralateral uninjured proximal humerus. The center of the humerus medullary cavity and the height of the head were determined first. Then, three axial planes equidistant to each other were defined(b). ROIs were placed in the humerus head in each of the previously defined axial planes(c-e). CT, computed tomography; ROI, region of interest