You also mentioned having an os trigonum removed. If you will have surgery for your fracture and removal of your extra bone - you may well consider ligamentous stabilization at that time. This is a conversation that you should have with your surgeon. Ultimately, the decision is yours. As to your question about the effects of surgery on your range of motion, at the outset, your ROM will be limited and you are certainly going to need a course of physical therapy.
Many dancers return to dancing with no discernable difference in their range of motion.
Others have a significant limitation. Your recovery rests largely upon your commitment to your rehabilitation program and your motivation to improve. Be certain to get a second or even third opinion in these matters. Investigate your doctor's reputation and experience. Speak with his former patients if possible.