Yes. I had injured my back in a weightlifting accident to the point where I was taking two inch steps (yes, 2 inches was all I could move either foot forward at one time). Went to see my allopath and got maybe 10 degrees flexion from horizontal in a Lesseague's straight leg test before I started screaming. He put me on pain killer's/muscle relaxers. After the first round ran out, during which time I never walked correctly and had trouble moving, I went back. He prescribed again and said that if that didn't work, the next step was referral to surgery.
An admin asst at work suggested OMM. I went in and had to take the elevator to the second floor office. One side posture later and I'm walking out the door pain free. It took a few iterations of the treatment subsequent to that, but I've since earned two black belts and been physically active. It works.