Biomechanical effects of one ｏｒ two level cervical oblique corpectomy

English Keywords:Oblique corpectomy  cervical instability  Biomechanics

English Abstract:

  【Abstract】 Objective：To compare ｔｈｅ　changes in cervical biomechanical stability associated with one and two levels cervical oblique corpectomy.Method：Six aged human cadaveric cervical spine specimens（C3-T1，age 53-65） were tested：（1） normal；（2） after C4 oblique corpectomy；（3） after C4 and C5 oblique corpectomy.Pure moments were applied to induce flexion，extension，lateral bending，and axial rotation.The motion of all direction was recorded stereophotogrammetrically while the load were applied to the specimens.Result：Compared to normal，although the range of motion and neutral zone after one level oblique corpectomy increased during flexion/extension，lateral bending and axial rotation，the difference between the two group was not significant.The two level cervical oblique corpectomy caused much more alterations in the range of motion and neutral zone between C3 and C6 compared with the intact specimens.Conclusion：One level cervical oblique corpectomy does not induce significantly instability compared with normal.While the two level cervical oblique corpectomy causes significantly increase in the range of motion and neutral zone between C3 and C6.