腰椎间盘局限性高信号区(HIZ)的发生与分布规律

Development and distribution of high-intensity zone in lumbar disc

[目的]探讨腰椎间盘局限性高信号区(HIZ)的发生与分布规律。[方法]回顾性分析1000例腰椎MRI资料。对HIZ进行立体定位并分析其发生与分布规律。采用SPSS11.0对所得数据进行统计学分析。[结果]本组HIZ发生率46.7%(前缘21.5%,后缘31.7%),共650个。其中,左侧238个(36.7%),右侧220个(33.8%),无明显侧别差异(x2=1.0922,P>0.05)。下缘446个(68.6%),明显多于中部及上缘。HIZ好发节段为L3、4～L5S1,可单发或多节段同时发生。其中,前缘HIZ多见于L2、3和L3、4椎间盘,后缘HIZ好发于L4、5和L5S1水平。[结论]腰椎间盘HIZ发生率较高。常见于椎间盘后缘、下缘和下腰椎。可单节段发生,亦可同时发生于多个节段。

[ Objective ] To explore the prevalence and distribution of High-intensity Zone （HIZ） in lumbar disc. [ Method ] Magnetic resonance images of 1 000 lumbarintervertebral discs were retrospectively analyzed. The HIZs founded in this sample were located in 3 dimensions and analyzed for its developing and distributing characters. All data were analyzed with SPSS software. [Result] The incidence rate of HIZ was 46. 7% （in anterior annulus fibrosus AF 21.5%, in posterior AF 31.7% ） and the sum total were 650. The distribution showed no difference （x^2 = 1.0 922, P 〉0. 05） between left AF （238, 36. 62% ） and right AF （220, 33.85% ） . More HIZs （446, 68. 62% ） were located in inferior AF than that of middle or superior AF. The motion segments from L3.4 to L5S1 were the region that the HIZ occurred frequently and it could present in single segment or multi-segment. In anterior AF, HIZs often occurred at L2,3 and/or L3,4 discs. Whereas, they usually developed at L4,5 and/or L5S1 in posterior AF. [ Conclusion] The incidence rate of HIZ in lumbar disc is higher. Posterior and inferior AF of discs and lower motive segments have more risk of HIZs. It could develop in single motive segment or multi-segments at one time.