Imaging Evaluation of Insertion Point Accuracy in Retrograde Intramedullary Femoral Nailing

Figure 1

Measurement of deviation: (a) on the sagittal plane, line segment 1 is drawn across the axis of the intramedullary nail, and line segment 2 is drawn perpendicular to the axis of the intramedullary nail. Line segment 2 intersects the edges of the intramedullary nail at points C and D, respectively. . The intersection of line segment 1 and the femoral condylar cortex is point A, and the ideal insertion point is point B. . Point A is in front of Blumensaat’s line; thus, the deviation value is positive. (b) Similarly, on the coronal plane, . Point A is lateral to the middle of the intercondylar sulcus; thus, the deviation value is negative.

(a)

(b)