Hi,
At 63 yrs old, I have had almost every imaginable tooth and gum problem one could think of; but have not had this kind of surgery.
I can't give you any first-hand experience with it. But, I do suggest you get more than one opinion. See at least two different surgeons, (Dental Surgeons?). It always helps to get two different Professional opinions, asking them both the same questions.
I am sure they can explain any risks involved.
Here is a link for some good information:
http://www.ctds.info/tmj.html
I do wish you the best of luck, and Happy New Year!