U might be suffering from ankylosing spondylitis
According to ur MRI
finding- AS is of grade1 or 2.
For diagnosis of AS- Radiographic presentation of sacroilitis is necessary.Beside this patient must exhibit 2 of the following 3 criteria-
1) LBP &stiffness=3 months with palliation by exercise &no relief with rest.
2)Limitation of lumbar spine
3)Limitation of chest expansion.
Ur doctor gives u NSAIDs, DMARDs. U also needs lifestyle modfication.