I Have Had A Lot Of Osteoarthritis And Hurt Continuously.

I have had a lot of osteoarthritis and hurt continuously. I have tingling and numbness in my shoulder down my arm into my hands and down legend feet. I just recently had an mri done with stated abnormalities and that I had a thecal sac leakage. I was wandering what is thecal sac leakage and from some of my symptoms I am scared I have ms