Methods Eighty vertebrae from 20 cadavers were exanmied by x ray,and divided into two groups:osteoporosis and normal control,based on the changes of the trabecula number on x ray film.

• 方法20具不同性别年龄尸体80个颈椎相同条件下摄片,根据骨小梁数目变化分为正常组与疏松组。在相同部位取材、处理,电镜观察。