Dear Maiaoz.
First of all, what do you mean by "mishandling" your own pelvis? Was it due to a trauma?
Secondly, just to clarify. It is literally STUCK in a position, it does not MOVE 10 cm?
Thirdly, 10 cm. is quite a lot. Who measured this? Was it eyeball estimation by a therapist or yourself? You mention both "turning inward" and "it never came up". In what direction is it misaligned and from what reference point (reference to leg length or from left ilium to spine/belly button)?
Fourth, what is your main activity restriction due to your misaligned pelvis? Is this mainly due to pain or stiffness? And where is the main area of pain or stiffness?
Lastly, if the pelvis is misaligned and stuck by 10 cm, then I am of the same opinion as you, I hardly see any physio or osteopath being able to correct this. A physiotherapist could provide management strategies to help you improve your activity restrictions but only in terms of exercise therapy. I would therefore, based on the information so far, advice you to seek an opinion from an orthopedic surgeon concerning the 10 cm. misalignment of your left pelvis.
Kind regards,
Sigurd Mikkelsen