Methods:Analyse the lumbar spine X-ray of 240 cases of lumbar disc prolapse proved by MRI with interiliac line and lumbosacral transitional vertrebrae.

• 方法：用髂嵴上缘连线与腰4椎体下缘的位置关系，腰骶移行椎，分析240例经MRI证实的腰椎间盘突出症患者的X线平片。