正常国人腰段椎管内硬膜外背侧脂肪含量的影响因素分析

Analysis of related factors of the content of epidural fat in posterior aspect of lumbar spinal canal in normal adult fellow countrymen

目的：探讨正常国人椎管内硬膜外背侧脂肪含量的相关影响因素。方法：在MRI正中矢状面图像上统计263例正常国人腰段椎管硬膜外背侧脂肪厚度,计算其中120例相应层面椎管前后径,同时计算其中50例的体重指数。将263例分为青壮年组（18~59岁,207例）和老年组（≥60岁,56例）;腰椎生理弯曲度分为三级,即明显变直、轻度变直和正常曲度。结果：腰段硬膜外各节段背侧脂肪含量均与体重指数、椎管前后径及生理弯曲度呈正相关;老年组L3/4节段硬膜外背侧脂肪含量厚度小于青壮年组,其余节段两组间差异无统计学意义（P〉0.05）;不同性别间硬膜外背侧脂肪厚度差异无统计学意义（P〉0.05）。结论：正常国人腰段椎管内硬膜外背侧脂肪含量与体重指数、椎管前后径及腰椎生理弯曲度相关,与年龄、性别无相关性。

Objective：To analyse the related factors of the content of epidural fat in posterior aspect of lumbar spinal canal in normal adult fellow countrymen.Methods：The thickness of posterior epidural fat in 263 cases of normal adult fellow countrymen were measured on mid-sagittal plane of MRI,as well as the anterior-posterior dimension of the lumbar canal on the same slice in 120 cases and the body mass index（BMI）in 50 cases.The 263 cases were divided into two groups：the young and middle-aged group（age ranged from 18 to 59y）and the elderly group（age≥60y）.The lumbar curve was divided into obviously straightened,mildly straightened and normal.Results：The content of epidural fat posterior aspect of lumbar canal were found to be correlated with BMI,the anterior-posterior dimension of the lumbar canal and lumbar curve.Apart from the L3/L4 segment,in which the thickness of epidural fat in the elderly group were less than that of the young and middle-aged group,no statistical difference was existed in the thickness of epidural fat between the two groups in other segments（P〉0.05）.Also,there was no statistical difference in the thickness of epidural fat between two genders（P〉0.05）.Conclusion：Our results suggest that the content of epidural fat in the posterior aspect of lumbar canal in the normal fellow countrymen were correlated to BMI,the anterior posterior dimension of lumbar canal and normal lumbar curve,yet with no correlation with gender or age.