I've known ballerinas who were able to dance after surgery, though probably not professionally. If the fusion is thoracic, it would have relatively little impact on many bending moves.
The letter states that the child was diagnosed at 5 and apparently had surgery 8 years later, at 13.
Never argue with an idiot. They always drag you down to their level, and then they beat you with experience. --Twain
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Surgery 2/10/93 A/P fusion T4-L3
Surgery 1/20/11 A/P fusion L2-sacrum w/pelvic fixation