Hi,
If your ITB is not snapping over your greater trochanter (place your finger over the bony point of the upper thigh when standing and twisting with the weight through this leg), you may have a labral tear in the hip joint.
The labrum is a cartilage rim that deepens the socket whilst wrapping around the femoral head, holding the ball in the socket. If you have tear in the labrum, you can be displacing it via certain movements.
A specific MRI scan may be of assistance, however the gold standard is a hip arthroscopy by an orthopaedic specialist experienced with this problem. Such specialists are not great in number.
Hope this helps.
MrPhysio+