ACL injuries: Growing number of child cases prompts call for national database:
-- Sports injury expert Professor Caroline Finch from Federation University said that would just be the tip of the iceberg.
--That's the ACL. This is what it looks like when you rupture it.
the tip of the iceberg:
a problem of difficult situation that shows that a much more serious problem exists.
1. to burst or break apart sth inside the body; to be broken or burst apart;