Fig. 2From: Digital anatomical study and clinical application of screw placement for quadrilateral plate fractures in the danger zonea-i: The illustration presenting the angles for safely introducing the drill-bit from Insertion Point A, O and B (simulating a clinical scenario): the angle between the green dotted line and the black solid line represents the angle of drill. With quadrilateral surface as a sign, we can see the range of three different angles in male and femaleBack to article page