Thanks for taking the time to write. Without being able to see the tree and how bad the damage is, I can't say for sure what your best course of action is. I'd strongly recommend you contact a professional arborist in your area --- he or she should be able to easily give you the answer you need!
Sorry I can't help more, but this is really a case where I'd need to examine your tree to give you an accurate answer.
---Justin, Senior Garden Editor, BHG.com