腰仙移行椎の形態的特徴と上位椎間への影響

抄録

The relationship between the abnormalities of the posterior elements and anterior elements in lumbosacral transitional vertebrae, and then the relationship between disc degeneration and lumbosacral transitional vertebrae were investigated. The modified Jinnaka's classification for the abnormalities of posterior elements and the modified igh's classification for the abnormalities of anterior elements were employed for this purpose. Of 597 patients with low back pain, 82 patients (14%) presented the posterior abnormalities and 90 patients (15%) presented the anterior abnormalities. Ninety% of type I of posterior abnormalities showed normal disc in anterior, whereas only 4% of type II-IV showed normal disc. Ninety-four% of type III of posterior abnormalities had type I and type II (and III) of anterior abnormalities which were thought typical fixed transitional vertebrae. It presents a greater than normal incidence of the disc degeneration, especially posterior slip at the level of just above the lumbo-sacral transitional vertebrae.