Biomechanical comparison of anterior cervical spine instrumentation techniques with and without supplemental posterior fusion after different corpectomy and discectomy combinations

被引:29
|
作者
Setzer, Matthias [3 ,4 ]
Eleraky, Mohamed [3 ]
Johnson, Wesley M. [3 ]
Aghayev, Kamran [3 ]
Tran, Nam D. [3 ]
Vrionis, Frank D. [1 ,2 ,3 ]
机构
[1] Univ S Florida, H Lee Moffitt Canc Ctr, Coll Med, Dept Neurosurg, Tampa, FL 33612 USA
[2] Univ S Florida, Coll Med, Dept Orthoped, Tampa, FL 33612 USA
[3] Univ S Florida, Coll Med, H Lee Moffitt Canc Ctr & Res Inst, Neurooncol Program, Tampa, FL 33612 USA
[4] Goethe Univ Frankfurt, Dept Neurosurg, Frankfurt, Germany
关键词
cervical spine; multilevel corpectomy; spinal fusion; biomechanical stability; spinal instrumentation; TITANIUM MESH CAGES; MULTILEVEL CORPECTOMY; RECONSTRUCTION; STABILITY; FIXATION; 4-LEVEL;
D O I
10.3171/2012.2.SPINE11611
中图分类号
R74 [神经病学与精神病学];
学科分类号
摘要
Object. The objective of this study was to compare the stiffness and range of motion (ROM) of 4 cervical spine constructs and the intact condition. The 4 constructs consisted of 3-level anterior cervical discectomy with anterior plating, 1level discectomy and 1-level corpectomy with anterior plating, 2-level corpectomy with anterior plating, and 2-level corpectomy with anterior plating and posterior fixation. Methods. Eight human cadaveric fresh-frozen cervical spines from C2-T2 were used. Three-dimensional motion analysis with an optical tracking device was used to determine motion following various reconstruction methods. The specimens were tested in the following conditions: 1) intact; 2) segmental construct with discectomies at C4-5, C5-6, and C6-7, with polyetheretherketone (PEEK) interbody cage and anterior plate; 3) segmental construct with discectomy at C6-7 and corpectomy of C-5, with PEEK interbody graft at the discectomy level and a titanium cage at the corpectomy level; 4) corpectomy at C-5 and C-6, with titanium cage and an anterior cervical plate; and 5) corpectomy at C-5 and C-6, with titanium cage and an anterior cervical plate, and posterior lateral mass screw-rod system from C-4 to C-7. All specimens underwent a pure moment application of 2 Nm with regards to flexion-extension, lateral bending, and axial rotation. Results. In all tested motions the statistical comparison was significant between the intact condition and the 2-level corpectomy with anterior plating and posterior fixation construct. All other statistical comparisons between the instrumented constructs were not statistically significant except between the 3-level diScectomy with anterior plating and the 2-level corpectomy with anterior plating in axial rotation. There were no statistically significant differences between the 1-level discectomy and 1-level corpectomy with anterior plating and the 2-level corpectotny with anterior plating in any tested motion. There was also no statistical significance between the 3-level discectomy with anterior plating and the 2-level corpectomy with anterior plating and posterior fixation. Conclusions. This study demonstrates that segmental plate fixation (3-level discectomy) affords the same stiffness and ROM as circumferential fusion in 2-level cervical spine corpectomy in the immediate postoperative setting. This obviates the need for staged circumferential procedures for multilevel cervical spondylotic myelopathy. Given that the posterior segmental instrumentation confers significant stability to a multilevel cervical corpectomy, the surgeon should strongly consider the placement of segmental posterior instrumentation to significantly improve the overall stability of the fusion construct after a 2-level cervical corpectomy. (http://thejns.org/doi/abs/110.3171/2012.2.SPINE11611)
引用
收藏
页码:579 / 584
页数:6
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