Abstract: Purpose：To measure the locationof fractures radial head using quantitative 3-dimensional computed tomography (CT). Materials and methods: We measured the fracture lines with respect to the biceps tuberosity in 24 patients with a displaced articular fracture of part of the radial head (12 terrible traid injury and 11 other injury). Results: 23 fractures created 43 fragments (average 1.9). In terrible traid injury, 12 fractures created 26 fragments, (average 2.2); In other injury cases, 11 fractures created 17 fragments (average 1.5). And the scattergram was created to show the centers of fragments. Conclusion: This quantitative analysis of CT scans of displaced articular fractures radial head confirms that the most common location is the anterolateral quadrant with the forearmin neutral rotation. Given the important role of the radial head in elbow stability, more accurate characterization of incomplete radial head fractures may improve our understanding of treatment and outcome of these fractures.