Objective To explore the image correction of fracture displacement by conventional X-ray photography(orthotropic and lateral) and test by computed tomgraphy(CT).

Methods The correction method of fracture displacement was designed according to geometry principles of X-ray photography. Selected one midhumeral fracture specimen which designed with lateral shift and angular displacement, and scanned from anteroposterior and lateral position respectively, and also volume scanned using CT, the data obtained from volume scan were processed using multiplanar reconstruction (MPR) and shaded surface display(SSD). The displacement data relied on X-ray image, CT with MPR and SSD processing, actual design of specimens were compared respectively.

Result The direction and degree of displacement among correction data of X-ray im-ages and the data from MPR and SSD, actual design of specimen were little difference, location difference < 1.5 mm, degree difference < 1.5°.

Conclusion It is really reliable for fracture displacement by conventional X-ray photography with coordinate correction, and it is helpful to obviously improve the diagnostic accuracy of the degree of fracture displacement.