2İstanbul Teknik Üniversitesi, Makine Fakültesi, Mukavemet Birimi, Biyomekanik Laboratuvarı, İstanbul OBJECTIVE: This study was designed to examine the biomechanical effects to stability of one, two and three level laminectomy of the cervical spine by the posterior approach.
METHODS: Strain gauge techniques were used with in vitro sheep cervical models. Seven of thirty-five sheep C3-7 spinal segments were used to detect the maximal loading level and elastic zone for the motions of flexion, extension, right and left lateral bending, and axial rotation.The remaining twenty-eight segments were divided into four groups: Group A with no surgical intervention, Group B with one-level laminectomy, Group C with two-level laminectomy and Group D with three-level laminectomy. Load deformation curves were recorded for all groups by applying moment from zero to five N-m for flexion, extension, right and left lateral bending and axial rotation. Deplacement angle values were measured at moments of 2.5, 3, 4, and 5 N-m for each motion. The four groups were compared and the results were evaluated statistically.
RESULTS: The deplacement angle values of four groups were significiantly different from each other with flexion, extension, right and left lateral bending, and axial rotation in the range of the elastic zone when moment was applied to the spinal segments.
CONCLUSION: The study supports the notion that one-, two- or three-level laminectomy of the cervical spine by the posterior approach upsets its stabilization.
Anahtar Kelimeler : Cervical spine, laminectomy, stabilization, biomechanics