Fig. 6

Stress nephograms over the screw in four different fixation models. (A) PS-PS; (B) CBT-CBT; (C) PS-CBT; (D) CBT-PS.

The screw tail closure area in the PS-PS internal fixation model was defined as “one” and compared with the screw tail closure area in the other three groups of internal fixation models. The PS-CBT model had the largest screw tail area, while the CBT-PS model had the smallest screw tail area.