Morphological characteristics of lumbar vertebral bodies and regional distribution patterns of bone mineral density: a CT study.

3.3 Results of CT value measurements in different intravertebral regions 3.3.1 Comparison of sagittal partitions CT values for the upper, middle, and lower thirds of each vertebral body in the sagittal plane consistently showed an increasing trend: upper 1/3 < middle 1/3 < lower 1/3 ( Table 3 ; Figure 4 ).

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The L5 vertebra showed a contrary trend: CT values in quadrants 1 and 2 of the upper third were slightly higher than those in quadrants 3 and 4, but the difference did not reach statistical significance. 3.3.3 Longitudinal comparison between vertebral levels Regardless of sagittal or horizontal partitioning, CT values across different vertebral levels generally followed a similar pattern: L1 highest, followed by L2, then L5, with L3 and L4 being the lowest ( Tables 3 – 6 ).

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