Lumbar spinal canal stenosis was divided into congenital developmental stenosis, degenerative stenosis, nerve root canal stenosis, spondylolisthetic stenosis and other stenosis. 根据病理变化和临床表现,将椎管狭窄分为:原发性椎管狭窄,退变性椎管狭窄,神经根通道狭窄,腰椎滑脱椎管狭窄及其它。
The mechanism of reduction is that the LSRF used contacted point of lamina by lamina hook as the fulcrum, through the pedicle screw to pull the spondylolisthetic vertebrae, and reduce the anterior displacement of vertebrae. MRF的复位机制为以椎板钩与椎板接触点为支点,利用椎弓根螺钉将滑脱椎体向后上提拉,使椎体前移复位。