单侧多节段后部结构切除对腰椎旋转稳定性影响的生物力学研究

The effect of rotational stability of multilevel lumbar spine following unilateral posterior structure resection:a biomechanical study

目的：研究多节段脊柱后部结构对腰椎旋转稳定性的影响。方法：选用７具成人新鲜尸体脊柱标本（Ｌ１～Ｓ１），采用单侧多节段逐步切除腰椎后部结构的方法，形成７种状态，从单侧多节段开窗至全椎板及双侧小关节切除等。通过脊柱三维运动试验机施加１０Ｎｍ的扭转载荷，使脊柱产生左、右轴向旋转运动。结果：全椎板加双侧小关节部分切除后，腰椎旋转稳定性受到显著影响。结论：除小关节骨性结构及关节囊外。

Objective: The experiment was designed to evaluate the influence on rotational stability of multilevel lumbar spine following unilateral posteriorstructure resection.Methods:The experiment was carried out with 7 fresh cadaver lumbar spine specimens(L 1～S 1).By gradully resected unilateral multilevel posterior structure,seven models were made,from unilateral laminotomies to total laminectomies.A three dimensional movement device,with the maximum loading of 10.0 N·m to produce ratational movement. Results:The range of motion increased singnificantly after total laminectomies and bilateral 1/3 facetectomies.Conclusions: Besides apophysial joints, laminae and posterior ligaments play an important role in resisting lumbar spine rotational movement.