Effects of Elastic Curved Bone Drill Unit on Percutaneous Vertebroplasty

Abstract：Objective To evaluate the effect of elastic curved bone drill unit upon percutaneous vertebroplasty. Methods Calf osteoporosis vertebral were prepared with EDTA-Na2 immersion in vitro. 40 osteoporotic vertebral bodies were randomly divided into group A and B. Each group had 20 vertebral bodies for vertebroplasty. Group A underwent routine straight bone drill puncture. Group B accepted self-made elastic curved bone drill unit puncture. Puncture were directed toward the other side,depth to the first 1/3 termination of vertebral body,statistical analysis the two groups of puncture bone drill and bone ce-ment which achieved or over the sagittal midline. Results EDTA-Na2 immersion decalcified for 9 days successfully induced vertebral bodies osteoporotic in vitro. 7 vertebral bodies of Group A that drill bit reach or over vertebral sagittal midline,11 ver-tebral bodies showed bone cement distribution beyond the vertebral sagittal midline. 18 vertebral bodies of Group B that drill bit reach or over vertebral sagittal midline,19 vertebral bodies showed bone cement distribution beyond the vertebral sagittal mid-line. The effect of drilling and distribution of bone cement on the two groups had statistical significance(P<0. 05). 9 vertebral bodies of Group A experienced intraspinal bone cement leakage,but 4 happened in group B,the leakage of bone cement showed no significant difference between Group A and B(P> 0. 05). Conclusion The self made elastic curved bone drill unit can build an osseous channel that reach or beyond the vertebral sagittal midline only through one side transpedicular puncture,then guided bone cement distributed to the other lateral of puncture,it will avoid the disadvantages of bilateral pedicle puncture. The result show that the self made elastic curved bone drill unit has adventage in vertebroplasty than that of traditional straight bone drill.