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| Finite Element Analysis of Two Kinds of Internal Fixation Methods after TotalSpondylectomy of Lower Cervical Spine |
1 School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
2 School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
3 Department of Orthopedics, Shanghai First People′s Hospital, Shanghai 200080, China
4 Department of Orthopedics, Shanghai Yangpu District Central Hospital, Shanghai 200090, China |
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Abstract To investigate effects from different combinations of anterior and posterior internal fixation on stability of the cervical spine after total spondylectomy of C5 vertebral. The intact finite element model of the lower cervical spine C3\|C7 was established based on CT images. Based on the verified finite element model of intact cervical spine, two reconstruction models after total spondylectomy of C5 vertebral were established: one was titanium mesh plus anterior plate plus posterior singlesegmental pedical screw model(TM+AP+SPS), the other one was titanium mesh plus anterior plate plus posterior doublesegmental pedical screw model(TM+AP+DPS). Moment of 0.5, 1.0, 1.5, 2.0 N·m was separately applied on top of the model, ROM of two reconstruction model under flexion, extension, lateral bending and torsion conditions and the stress distribution of internal fixation devices were analyzed. The ROM of reconstruction segments was increased with the increase of the torque, showing nonlinear trend, ROM of TM+AP+SPS model was increased larger. In the case of 1.0 N·m torque, the ROM of reconstruction segments was greatly reduced by over 83% as compare to that of the intact model.ROM of the adjacent segments of the TM+AP+SPS model was increased by over 11% under extension, bending and torsion conditions, the ROM of C6\|C7 segment was increased by over 41.79% under torsion condition, and ROM of adjacent segments of TM+AP+DPS model was significantly reduced. Stress of the titanium mesh of TM+AP+SPS model and TM+AP+DPS model were separately focused on the compression side and the rear. Adjacent segments of TM+AP+SPS model had a great compensatory activity, and ROM of each segment of the TM+AP+DPS model was significantly reduced, the stability of cervical spine was better in TM+AP+DPS model.
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