I agree with save the tree. This happened to me so many times through the years and I just pounded a stake in the ground and straightened it up right.
If it is because the weight of snow and ice it will even straighten itself up this Spring just not straight as it should be. That happened to me too. I did not straighten it up right and it raised when the sun and rain came in the spring but it was not straight it leaned a little.
