I have Right hip pain from 1 year and 4 months, its came while i was playing football and i heard tic sound on my hip. I checked more than 5 doctors some doctors that its only inflammation and took inflammation medicine but without any benefit and some doctor said that its may be from my back. I did X-ray, CT, US, MRI on my hip and no thing on bones or tendons and i did X-ray, MRI for my back and no thing. The pain came while setting too much or playing sports or sleeping on my right side. the hip pain came with lower back pain. no any pain with walking or running.
You have already performed most of the tests like MRI and found no internal injury related to bones or ligaments. The pain might be related to nerved or Vitamin D or Vitamin B 12 deficiency. Please get a blood test for vitamin D and Vitamin B 12. If found deficient, start the supplements.