腰椎骨密度与腰椎稳定性的相关性分析

目的：探讨腰椎骨密度与腰椎稳定性之间的关系。方法：选择70例进行过腰椎骨密度检测，并同时摄腰椎站立正、侧住及过伸过屈功能位X线片的患者进行回顾性分析。按T值不同，将患者分成骨量正常组（I组）、骨量减少组（Ⅱ组）和骨质疏松组（Ⅲ组）3组。测量并比较各组患者的腰椎曲度、Cobb’s角、椎间滑移距以及骶骨倾斜角。结果：①各组患者腰椎曲度、Cobb’s角、椎间滑移距比较，差异有统计学意义（P〈0．05）；组间两两比较，Ⅱ组和Ⅲ组在腰椎曲度和Cobb’s角两方面差异无统计学意义（P〉0．05），Ⅰ组和Ⅱ组患者的椎间滑移距差异无统计学意义（P〉0．05）；其余组间差异均有统计学意义。各组患者骶骨倾斜角比较，差异无统计学意义（P〉0．05）。②腰椎曲度和Cobb’s角分别与骨密度呈正相关（r=0．60，r=0．40）；椎间滑移距与骨密度呈负相关（r=-0．40）；骶骨倾斜角与骨密度无明显相关性（r=-0．14）。结论：随着腰椎骨密度降低，腰椎曲度变直，Cobb’s角减小，椎间滑移度增大，腰椎稳定性下降。

A correlative analysis between bone mineral density and stability of the lumbar spine

Objective： In order to explore the relations between bone mineral density （BMD） and stability of the lumbar spine. Methods： Seventy patients both having been measured BMD and lateral views on standing position digital radiographs（DR） of the spine were analysised. They were divided into 3 groups according to T value：normal bone mass （the first group） , low bone mass （the second group） and osteoporosis （the third group）. The lumbar curvature, the lordosis Cobb angle, the slippage between vertebral and the sacrum slant angle of the DR were respectively measured and compared in the 3 groups. Results： ①The lumbar curvature and the Cobb angle and the slippage, except the sacrum slant angle, were statistical difference （P 〈 0.05）. Concerning intergroup variances, there was no significant difference between the second and the third group in the lumbar curvature or the Cobb angle （ P 〉 0.05 ） , there was significant difference in the slippage （ P 〈 0.05 ） but of the first and second group. ② There were positive correlation between the BMD and the lumbar curvature and the Cobb angle （r = 0.60,0.40, respectively ） , and negative correlation between the BMD and the slippage（ r = -0.40 ）. There was no prominent correlation between the BMD and the slant angle（r = -0.14）. Conclusion： With the decrease in BMD, the slippage between vertebral was increasing , the lumbar curvature and the Cobb angle and the stability were decreasing.