Fig. 1
From: Retrospective study about the postoperative stability of zygomaticomaxillary complex fracture
The measurement of amount and direction of displacement of the fractured segment. a CT images are superimposed using Invivo 5, version 5.3 software. As shown in the picture, several landmarks (a total of five in this picture) that do not change after fracture were matched, and the CT image immediately after the operation and the follow-up CT image were superimposed. The blue impression is a postoperative CT image and the white impression is a follow-up CT image. b-1 The measurement of the amount of displacement of the fractured segment. By adjusting the brightness and contrast of the postoperative CT and follow-up CT images, the margins of each bone fragment were well distinguished. After that, the highest points and lowest points of the fracture fragments of the two CT images were connected to each other, and the distance was displayed. b-2 A magnified picture of the fracture site of the figure b-1. The amount of displacement of the fractured segment. The amount of displacement of the fractured segment was calculated by averaging the displacement of the highest points (a green number, 3.90 in this picture) and the lowest points (a red number, 3.17 in this picture) of the fracture. The displacement direction of the fractured segment. The displacement direction of the fractured segment was investigated by the direction of the line connecting the center point of the fracture fragment (blue arrow)