Effect of Bevel Needle in Percutaneous Vertebroplasty.

Objective To discuss the application and advantage of two kinds of needling instrument, the diamond needle and the bevel needle, in percutaneous vertebroplasty (PVP) . Methods We dissociated spinal column of 10 adult corpses and get lumbar vertebraes 1-5 (L1-5) 10*5 sections. After examining each section's Bone Mineral Content, we finished percutaneous vertebroplasty, using diamond needle and bevel needle. The different puncture path and the distribution of bone cement were observed. The needle deflection data of puncture path were measured using straightedge and angle ruler on vertebral radiographs. The distribution of bone cement in vertebral was observed on CT scans. Statistical analysis was performed on the deflection measurement data. Results Bevel needle occurred deflection back to slope in the vertebral bone by (1.83±0.2) °- (3.30±0.3) °angle (x±s). Diamond needle did not occur deflection in the vertebral. CT scan display: the cement biased distribution to the slope of the bevel needle and can be distributed as class ellipsoid by rotating needle. Bone cement from the top of the diamond needle overflows directly toward the apex, becoming a class spheroids and can not be adjustesd the direction and distribution area by rotating the needle. Conclusion Experimental observations show that bevel needle can get accurate puncture path and control of bone cement filling effect in the target region in the vertebra. [ABSTRACT FROM AUTHOR]