I have to say, that after reading some of Dean Somerset’s work on Glute activiation, hip flexor issues, and abdominal weakness, I am all in on this. In addition to the stretch recommended above, try the “awaken the glute Monster” article. The hip flexors may need more stretching / and they may be contracting so hard as to pull your hip to one side or another requiring your lateral hip muscles to over-correct–my problem. Hip bridges seem to be working the best to help, but also anything that will stretch the IT Band and lateral hip muscles (the piriformis).
Check around to see how those tiny lateral hip muscles attach and move. The chiropractor should suggest using a stability ball overhead and bending and holding from one side to another. This is still an ouchy ouchy exercise for me, but I am making progress. I am seriously injured, more so than I thought.
Also, look up how to perform the yoga stretch known as pigeon, and try some Yoga right angle poses as well to dig into that IT Band. If you look pigeon up on the Internet, keep in mind that you may not be able to get your bent leg at a 90 degree angle to your body. It’s ok to keep it tucked in close to your groin. Visit a yoga, Les Mills BodyFlow, or PiYo, instructor if you need fine tuning on these poses.