Cord indentation is sign of stenosis, or narrowing of the spinal canal where the disk is intruding, The way it was explained to me is that the spinal cord is like a cake, once dented or damaged it cannot be repaired, personally i find this to be hog wash. my wife just had 7 levels of stenosis surgically corrected and all lower symptoms are gone when the neurosurgeon said they would not be.your condition may not require any type of surgery, some good therapy may do the trick with emphasis on spinal decompression. unless of course the pain becomes really unbearable or symptoms get worse. or if you do need surgery a minimally invasive option should be available to you, such as laser treatment.