Hi, thanks for writing to HCM.
An xray of the involved Hip joint is mandatory to diagnose a dislocation and MRI
scan of the thigh will rule out the presence of soft tissue injury
either in the muscles, tendons etc.
So, a detailed clinical examination will provide a clue for the diagnosis.
I suggest you to consult an orthopedic surgeon for further evaluation and management.
Hope this information is helpful. Good day