LATERAL RADIOGRAPH DIGITIZING POINTS
The points and their relative (x,y) coordinates were identified on the radiographs shown below. From this data flexion, extension and translation values were calculated to determine Alteration of Motion Segment Integrity (AOMSI).
1. In the angular analysis, the flexion view is the referenced position. The range of motion between the flexion view and the extension view must change in the correct relative position one to another. An increased angle from flexion to extension represents a normal finding. A positive angle is recorded when the extension angle changes correctly. If the extension angle decreases this is considered abnormal reciprocal / paradoxical motion and is recorded as a negative number.
2. In the translation analysis, the extension view is the referenced position. Translation should move in the anterior direction when comparing the flexion position to the referenced extension position. A positive translation is recorded when normal motion occurs. If translation moves in the opposite direction this is considered abnormal reciprocal / paradoxical motion and is recorded as a negative value.