In "Resolution of Lumbar Disk Herniation without Surgery", by Jennifer Hong, M.D., and Perry A. Ball, M.D. published in April 2016 in the New England Journal of Medicine, they show remarkable resolution of the injury in this case study.
The follow up MRI was performed 5 months after the initial injury, and showed resolution (medical for healing) of the lumbar disk injury by having an injection and working with a physical therapist.
You can read the full research article here at http://www.nejm.org/doi/full/10.1056/NEJMicm1511194.