Arthurs et al developed equations for estimating the mid-spinal canal depth (MSCD) in neonates based on ultrasonographic studies. The authors are from Addenbrooke's Hospital in Cambrdige and St. Michael's Hospital in Bristol.
Patient selection: neonate
Parameters:
(1) weight in kilograms
anterior spinal cord depth in mm =
= (1.4 * (body weight) + 5.49
posterior spinal cord depth in mm =
= (3.0 * (body weight) + 8.28
mid-spinal cord depth in mm =
= ((anterior SCD) + (posterior SCD)) / 2 =
= (2.2 * (body weight)) + 6.89
simplified mid-SCD =
= (2 * (body weight)) + 7
estimated spinal canal diameter in mm =
= (1.6 * (body weight)) + 2.79
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