Fig. 6.

Diagrams showing a classification system of the bone cement spread injected in the treated vertebral body. Type 1 : Evenly spread bone cement in both sides. Type 2 : Dominantly spread in the ipsilateral side, but filled up sufficiently in the opposite side also. Type 3 : Dominantly spread in the ipsilateral side and insufficiently filled up in the opposite side. Type 4 : only filled up in the ipsilateral side. Type 5 : Dominantly spread in the contralateral side, but filled up sufficiently in the ipsilateral side also.