Methods To measure thickness part of lamina ablated of 20 vertebral canal in 4 adult cadavers,and review 36 cases following enlarge of vertebral canal reserving part of laminae.

• 方法对4具人体腰椎20个腰椎椎板上下厚度、棘突上下沿的测量,和36例保留腰椎板骨梁、骶棘肌悬吊椎管扩大术病人的观察。