Hill C A, Gibson P J
Department of Neuroradiology, Atkinson Morley's Hospital, London, United Kingdom.
AJNR Am J Neuroradiol. 1995 Mar;16(3):469-72.
To establish the normal range of the position of the conus medullaris in neonates and determine whether it differs from that in adults.
One hundred five healthy neonates born over an 18-day period in a single obstetric unit had ultrasound examinations of their lower spines to relate the conus medullaris to the nearest intervertebral disk or midvertebral level.
The mean position of the conus was midway between the L1-2 disk and mid-L-2 body, ranging from T-12/L-1 to L-3, with the modal position being L1-2 (47.6%). A small but significant rise in position from 33 to 42 weeks postconceptual age was identified. Comparison with data previously reported from adults showed a small but highly significant difference in conus position of approximately 0.25 vertebral levels.
Our data confirm studies suggesting that ascent of the cord after birth is minor.
确定新生儿脊髓圆锥位置的正常范围，并判断其与成人的是否不同。
在一个产科单元18天内出生的105例健康新生儿接受了下脊柱超声检查，以确定脊髓圆锥与最近的椎间盘或椎体中部水平的关系。
脊髓圆锥的平均位置在L1-2椎间盘和L2椎体中部之间，范围从T12/L1至L3，最常见位置为L1-2（47.6%）。发现从孕龄33周到42周脊髓圆锥位置有轻微但显著的上升。与先前报道的成人数据比较显示，脊髓圆锥位置有轻微但高度显著的差异，约为0.25个椎体水平。
我们的数据证实了此前提示出生后脊髓上升幅度较小的研究。
