Hi, @lavera – I would like to add my welcome to Connect along with @lisalucier and other members. I don't have any experience or knowledge of adhesive arachnoiditis but I found some information that may be helpful. The first one from the Cleveland Clinic in 2018 lists a clinical trial but I'm not sure of the status. It may be worth contacting them.

Rare Pain Condition Still Exists in New Forms with New Hope for Relief
-- https://consultqd.clevelandclinic.org/rare-pain-condition-still-exists-in-new-forms-with-new-hope-for-relief/

New Treatment Gives Hope to Arachnoiditis Patients - July 09, 2016
-- https://www.painnewsnetwork.org/stories/2016/7/9/new-treatment-gives-hope-to-arachnoiditis-patients