过伸复位治疗胸腰椎骨折脱位的生物力学实验研究

Biomechanical research on thoraciclumbar spinal fracture and dislocation with overextension relocation

目的：研究过伸不同角度前纵韧带受力大小及过伸角度和骨折脱位整复的关系。方法：采用８具新鲜胸腰段脊柱标本，制作损伤模型，模拟手术方式进行过伸整复，测定过伸角度和复位的关系及过伸角度和前纵韧带受力情况。结果：随着后弓角的矫正和前纵韧带的伸展，脊柱每后伸８°～１１°，脱位整复２～３ｍｍ。最佳过伸整复角度是１３°±３°，此时前纵韧带（Ｔ１２～Ｌ１）应变为１４．３±３％，小于前纵韧带的最大应变。结论：前纵韧带的充分伸展可提供足够的过伸整复矫正力，脊椎的过伸运动可有效地整复骨折脱位、后弓角。

Objective:To explore the stress on anterior longitudinal ligament with different overextension angle and the relationship between the degree and the fracture relocationMethods:The fracture models were made on 8 fresh thoraciclumbar spine specimens,and the overextension reolcation was simulated on the specimen Results:With the elongation of the anterior longitudinal ligament,the dislocation relocated 2 mm ～3 mm when the spine extended 8° to 11°The best overextension angle is 13°±3°Conclusions:The movement of spinal overextension can effectively relocate spinal fracture and dislocation,and restore the normal vertebral height