The term greenstick fracture refers to broken bones in kids where the bones are soft and can bend before they break (like a young green stick on a tree as opposed to an older branch which is stiffer and snaps).I am guessing that the fracture used in your rhinoplasty was performed by attempting...
I am sorry to hear about your situation regarding your nose. With regard to the best revision rhinoplasty surgeon in USA or Canada, it is quite difficult, if not impossible, to answer that question. You might be well served starting with an internet search of revision rhinoplasty specialists....
Indeed, a crooked nose can be straightened and brought back to its normal anatomical alignment. Nasal bones are straightened by medial and lateral osteotomies during rhinoplasty. Occasionally, a spreader graft needs to be placed in the mid third of the nose...