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Hello, Welcome to Just Answer and thanks for your question. Only the surgeon who looked at it can say whether you will require surgery or not. There is no way for someone who has not seen you and the scans that were done to make a judgment.
Some tendons do reattach and some don't. Without seeing it there is no way to tell what the chances are that yours will reattach without surgery. You may want to consider a second opinion from another surgeon who can actually look at your hand.
And mine, if you had the unreasonable expectation of being told yes or no without an examination. There is no way anyone can tell you if it needs surgery without seeing it. That is just the most basic of medicine.