What Causes Lower Back Pain?
Sprained back is a possibility.
Detailed Answer:
Hi, I had gone through your question and understand your concerns.
From x-Ray and MRI reports doesn't result a decent cause for your symptoms.
Mild back pain could be justified from fascet arthrosis on x-ray, but moderate to severe pain is not justified.
Overstretching of back muscles could be a possibility of your back pain.
It should started subsiding after drug treatment and physical therapy.
I suggest to continue treatment with pain medications and physical therapy for another two weeks.
You can apply warm procedures to your back too.
If symptoms persist, other causes of your concern should be evaluated.
Nerve damage usually gives symptoms in one or both legs too, besides the back.
Hope this helps. Feel free to ask if you have further questions.
Wishing you good health.
Injections help in selected cases.
Detailed Answer:
Hi again. In that case there is need to evaluate which damaged nerve causes your symptoms.
This can be done with clinical evaluation and nerve conduction test (ENMG).
After that there is created the possibility to inject cortisonics locally where the nerve is pinched. ( if it is pinched).
Hope this helps. Wishing you good health.