In our non-medical opinion, there is little evidence that injections are useful for diagnosis or resolution of hip pain.
We've compiled relevant information on this page: https://www.thefaifix.com/fai-diagnostic-tests-and-injections
Also, here's an interesting scientific study on hip injections vs placebos...
Hopefully the information there helps you understand the science and how to better approach your hip pain with a productive, empowered mindset. 😀