New treatent studies suggest Arachnoiditis progression can be stopped and in SOME cases reversed if diagnosed within 3 months of injury. Each person is different, so there is never a guarantee. A PDF file listed below will show the case studies and treatment options available.
https://www.google.com/url?sa=t&source=web&rct=j&url=http://arachnoiditishope.com/pages/wp-content/uploads/2016/11/arachnoiditis-handbook.pdf&ved=2ahUKEwiUtuuD74_iAhUEMqwKHbiiDR8QFjAPegQIARAB&usg=AOvVaw3ixmculuu8sWq8qxJE4GMe