You asked for a diagnosis. I gave you one. It could be originating from your facet joints, your sacroiliac, and other places. But it goes back to the spine, usually. Impinged nerves exiting the spine can cause this kind of disruption. You can also go to an EMT nerve doctor, who will test the nerves' firing/not firing, and they can determine the source as well. You don't have to have back pain as the pain is being referred FROM the spine, vertebral, facet joints, myomuscular source, and it is showing up as pain in your legs. It sounds like you pinched a nerve on your airplane ride, and you haven't recovered. You can go to an MFR therapist and get treated there. If it is resolved, then it was a myomuscular issue, and your back was destabilized in the process. you could also have some peroneal disorder. Its impossible to know because although you believe you provided sufficient info for a "diagnosis," there is not enough information about your history. Start with the Orthopedic Surgeon and work down - instead of the other way around. but an MFR therapist is the happy middle. if he makes you feel better you will know what the problem is.