| Home | Magazines | Editorial Board | Instruction | Subscribe Guide | Archive | Advertising | Template | Guestbook | Help |
| LI Tao,ZHU Yucheng,MA Jun.Multi-planar computerized tomography reconstruction for individualized and modified atlas pedicle screw placement[J].Chinese Journal of Spine and Spinal Cord,2012,(2):160-164. |
| Multi-planar computerized tomography reconstruction for individualized and modified atlas pedicle screw placement |
| Received:June 17, 2011 Revised:November 22, 2011 |
| English Keywords:Atlas, Pedicle screw, Modify, Multi-spiral computerized tomography, Multi-plannar reformation |
| Fund:基金项目：宿迁市社会发展基金项支持目（S201104） |
|
| Hits: 3313 |
| Download times: 2600 |
| English Abstract: |
| 【Abstract】 Objectives: To investigate the accuracy of individualized and modified atlas pedicle screw placement assisted by multi-planar computerized tomography (MSCT) reconstruction. Methods: 20 vertebraｌ specimens (11 males, 9 females) were examined by MSCT reconstruction. Modified pedicle insertion in atlas was determined as followings: parallel line (line A) between tangent line sited lateral side of vertebral channel (line L1) and line L2 sited medially to the transverse foramen. Related parameters such as entry point and orientation of atlas pedicle screw were determined. Based on these parameters, 3.5mm screws were inserted into atlas of 20 specimens. After insertion of screws, MSCT scanning and reconstruction were performed again to evaluate the accuracy of instrument. Results: According to individualized and modified C1 pedicle placement on MSCT, the distance between entry point of C1 pedicle screw and midline of C1 posterior arch averaged 25.8±1.9mm for the right side and 25.7±1.8mm for the left side, which sited more laterally than traditional anchoring point (18-20mm). The introversion angle was 21.1°±4.6°for the right side and 20.0°±4.9°for the left side, which was larger than traditional introversion angle (0 or 10 degrees). 40 pedicle screws were placed in C1 accurately. According to the Ludwing classification, there were 36 (90%, 36/40) grade zero, 4 (10%) grade one and no grade two. Conclusions: Multi-planar computerized tomography reconstruction can establish modified pedicle screw instrumentation including entry point and orientation, which has more lateral entry point and more introversion angle so as to improve accuracy of instrumentation. |
| View Full Text View/Add Comment Download reader |
| Close |
|
|
|
|
|