Arthritis is a condition which affects joints - lead to damage of structures around it..usually in the back it may be due to wear and tear of the joints..so it is usually associated with numbness and weakness.
Most of the conditions are manageable and correct able..so consult a neurosurgeon and follow his advice..
We understand your feel and your pain. But then it seems that your condition is already diagnosed. It is pretty sad that you are facing this at such young age. Arthritis is nothing but the erosion of bone by the reduction of space between them. When both bones touch each other there would be pain. We cannot remove it because it is associated with bone itself. Instead we can try medications and physiotherapy of it is possible. If not it need surgery.
Consult your orthopedic doctor today.