Hey,
did you get any update on what happened?
I've just 10 days ago had my acl reconstruction, but its been a
problem for about 7 years, it used to feel ok, and then bam!!the knee
would go again... It is tough and scary, but having been through this
all before i guess you'll find it easier to cope with whats to come,
and on your recovery make extra efforts... but best of luck...