Have got ur self examined by a Neurospecialist?
Have u undergone nerve conduction study?
Looks like something related to back or legs not diagnosed.
How is the pain now?
Occurs sometimes or all the time?
How does it get better?
Any weakness or numbness in legs?
Next Steps
Just Mri of back will not suggest anything except no major pathology in back. Still can have an issue with ligament, nerve, muscle or joint.
Health Tips
Can consult with these details if u like.