Hi...not all with chiari have a tethered cord and unfortunately medical boards do not all agree with the TC release surgery...bcuz most TC's do not show on MRI's and bcuz they can re-tether.
I have TC and was scheduled for the release and they changed it to a PFD and I did well with that, I still am to look at that surgery if /when the symptoms get so bad ...but, the PFD did help me more then just the release would have.
If the cord is so tight that it needs to be addressed asap, I was told u would know in 6 weeks post op of the PFD surgery....
But medical boards and ins plans have a say in what many Drs can do, and is y many of the chiari specialists do not participate in ins plans.....
There are NS's that will do this surgery is it is warranted.