I completely agree with Joanne. If you are not specifically licensed to help people overcome injuries of that nature your best bet would probably be to refer them out to a professional you trust.
Several months ago a client of mine was experiencing what I thought to be myofacial-related pain in her right hip. I recommended she see a local ART Therapist for proper diagnosis which was definitely a good choice since I wanted to stay within my scope of practice. The therapist concluded that she had a minor case of myofascitis from working a few of the external rotators in her hip a bit too hard.
In short; the therapist was able to fill me in on his findings, provide me with some safe adjustments to her exercise program, and a few weeks later she was pain free.
Best of luck to you and your client!