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A fall before 1 year is a long time. May be you might have injured the muscles in the right buttocks but it must heal by now. You can go with X-ray of Right hip joint to start with and then after that MRI
or CT Scan
may be helpful. You can start with Hot and Cold
fomantation in the area of injury
by sitting in a tub with warm water alternating with cold water which might help you out.
Feel free to contact me for further help.