Confocal images were obtained to confirm the effect of fiber orientation in the case of cells under static and dynamic conditions on nanofiber coated spiral scaffolds. Figure 8A shows Schwann cell proliferation on aligned nanofibers on day 4. From the figure it is evident that the cells oriented along the direction of the nanofibers. Figure 8B shows the image of aligned nanofiber containing spiral scaffolds when subjected to dynamic conditions. From the images, it is evident that the shear conditions and the rotation of the vessel did not have any impact on the orientation of the cells on the scaffolds and an increased number of cells can be seen on the scaffolds as compared to static conditions. Based on calculation by Botchwey et. al [32] and Cui et.al34, it can be identified that a linear relationship exists between the particle radius and the shear stress acting on the surfaces. A linear calibration was identified as given by the equation below.

where R
p is the particle radius, in microns. All the calculations were made based on single particles suspended in medium rotating at a constant velocity in a rotating wall bioreactor. In our calculations however the particle size is the scaffold size, with wall thickness in the range of 500 to 600 microns. Based on this the stress can be identified as 0.3 N/m
2. It is well understood that for mammalian cells, the shear stress should in the range of 0.3-1 N/m2, beyond which severe damage to cells would occur, causing reduced cell proliferation rates and even cell death35. Our calculations indicate that the shear stress on our spiral walls are in the lower limit of this range, therefore minimal if any damage would occur.