Enhancement of Stability Following Anterior Cervical Corpectomy: A Biomechanical Study

摘要: STUDY DESIGN An in vitro biomechanical study of various reconstructive techniques following decompression the spondylotic cervical spine. OBJECTIVE.: To evaluate stability anterior plate fixation three strategies for multilevel spondylosis (three levels) spine: level discectomy, single corpectomy and a two-level corpectomy. SUMMARY OF BACKGROUND DATA The main goals surgical treatment myelopathy include adequate stabilization while maintaining or restoring lordosis. Cervical is often performed through followed by strut-graft reconstruction. with end-fixation (two points fixation) then used to span construct. authors propose an alternative long-segment end construct fixation. Often times, stenosis confined area degenerative discs. As result, feel that either discectomy combined segmental may provide increased rigidity as compared plate-constructs only. METHODS Seven human cadaveric fresh-frozen spines from C1-T1 were utilized. Three-dimensional motion analysis optical tracking device was determine reconstruction methods. All seven underwent testing randomized order. model consisted at C4 C5 polymethyl methacrylate strut graft PEAK (DePuy-AcroMed) plate. two constructs also utilized one undergoing discectomies C3-C4, C4-C5, C5-C6 interbody grafts other C3-C4 C5. specimens pure moment application 2 Nm regards flexion-extension, lateral bending, axial rotation. RESULTS.: three-level one-level significantly more rigid flexion-extension bending than end-construct (P < 0.05). There no increase during extension between (two-level corpectomy) un-instrumented grafted specimen. No difference noted CONCLUSIONS traditionally treated spanning graft. A large arm generated ends construct, potentially leading migration dislodgment. can be achieved This clearly demonstrates affords biomechanically method afforded decrease likelihood dislodgement setting instrumentation alone alone, long segment procedures.