目的 探讨CT后处理技术重建CT值与终板抗压强度的相关性。 方法 采用常规CT扫描5具小牛腰椎后，利用CT后处理技术重建终板并测量5个标准化测试位点的平均CT值，接着将腰椎分解成30个游离椎体，在骨性终板的标准化测试位点上使用直径5 mm的平底压头，以12 mm/min的速率进行单轴压缩实验，并根据载荷位移曲线确定每个测试位点的失效载荷值以计算抗压强度，使用组内相关系数验证测量结果一致性，应用相关性检验分析重建CT值与终板抗压强度的相关性。 结果 小牛椎体测试位点的重建CT值与抗压强度的观察者内和观察者间的组内相关性系数均大于0.9，对应测试位点的重建CT值和抗压强度具有强相关性（r>0.8, P<0.01）。 结论 CT后处理技术重建终板CT值与终板抗压强度之间存在显著的相关性，可以作为术前评估终板强度的参考指标。
Abstract
Objective To explore the correlation between CT reconstruction values and endplate compression strength by using CT post-processing techniques. Methods After conventional CT scanning of five calf lumbar vertebrae, endplates were reconstructed by using CT post-processing techniques and the average CT value of five standardized test points was measured. The lumbar vertebrae were then dissected into 30 free vertebrae, and a 5 mm diameter flat-bottomed pressure head was used to perform uniaxial compression tests at a rate of 12 mm/min on standardized test points of bony endplates. The failure load values of each test point were determined based on the load-displacement curve to calculate the compressive strength. The intraclass correlation coefficient was used to verify the consistency of the measurement results, and correlation analysis was applied to analyze the correlation between CT reconstruction values and endplate compression strength. Results The intra- and inter-observer intraclass correlation coefficients of the reconstructed CT values and the compression strength of the calf vertebral test points were both greater than 0.9, and the reconstructed CT values and compression strength of the corresponding test points had a strong correlation (r>0.8, P<0.01). Conclusions There is a significant correlation between CT reconstruction values of endplates and their compression strength, which can be used as a reference index to assess endplate strength before surgery.
关键词
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CT /
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终板 /
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CT值 /
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生物力学
Key words
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Endplate /
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CT Value /
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Biomechanics
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