thank you for the good advice..
Acute in this case probably means new, with inflammation, not "bad" although no complication of surgery is considered a cause for celebration. (Generally medicine doesn't qualify problems as good or bad, but uses terms like mild, moderate, and severe.)
Yes, many people experience fractures post spine surgery, especially the elderly as bone density decreases with age.
It is difficult to speculate on prognosis. Your doctor will be able to tell you what's next.
Your concern is understandable, certainly, but please try not to worry about things you cannot control. If you are in pain, call your PCP.
Remember to breath deeply and regularly when feeling anxiety.
Be consoled with the idea that with all the titanium stabilization along your spine, perhaps nothing needs to be done about this new issue, other than "keeping an eye on it."
Best wishes.