Methods:Degener ative spondylolisthesis cases were treated by bilateral partial hemilaminectomy preserving spinous process and H-shape bone grafting between spinous processes and laminae.

• 方法：应用保留棘突和部份椎弓的椎板开窗减压，加H型棘突间及椎板植骨融合术，治疗退行性腰椎滑脱。