The influence of coughing on cerebrospinal fluid pressure in an in vitro syringomyelia model with spinal subarachnoid space stenosis

Table 1 Summary of model parameters.

Variable	Dimension	Description
D_SAS	15.6 ± 0.3 mm	diameter of subarachnoid space
D_SC	10.0 ± 0.2 mm	diameter of spinal cord
T	1.2 ± 0.1 mm	thickness of the glass tube used to form the spinal column
T_SSED	12.0 ± 0.5 mm	distensible tube thickness for SSED
D_syrinx	7.0 ± 0.2 mm	diameter of syrinx (constant until 28.7 mm from rostral end of syrinx, tapered to 3.2 mm after that point)
L_SC	480 ± 2 mm	length of spinal cord and spinal column
L_syrinx	132 ± 1 mm	length of syrinx
L_stenosis	20 ± 1 mm	length of spinal subarachnoid space stenosis
%_stenosis	>90%	percent of spinal subarachnoid space blocked by stenosis
ID_stenosis	10.7 mm	approximate inner diameter of stenosis
E_SC	SSE = 0.32 MPa SRE = 0.83 MPa SAE = 0.52 MPa SSED = 0.52 MPa	Young's modulus of spinal cord
E_SSED	SSED = 1.99 MPa	Young's modulus of distensible spinal column (SSED)

Key: Tolerances are estimated from the manufacturing process tolerances and supplier specifications. SSE = stenosis with syrinx model, SSED = stenosis with syrinx model with distensible spinal column, SRE = stenosis removed model, and SAE = stenosis alone model.

ISSN: 2045-8118