Let me start by saying that any injury up past the femur is hard to treat, and I think I would probably euthanize unless the bird was a special pet or an important part of my breeding program.I have him on his back now there is none. It doesn’t make any noise, there’s also no feeling like anything is grinding.
Injuries in the area can be hard to detect. Spend some time examining the legs of a healthy bird to get an idea of what all of the joints feel like and how they move or don't move. Then compare your rooster's gimpy leg to those.