A recent study outlines simple decision rules that may decrease re-injury risk by up to 84% after ACL reconstruction.

The main take-aways from the study were:

Patients who returned to pivoting and cutting sports had a 4.32 times higher re-injury rate than those who did not
Re-injury rate was significantly reduced by 51% for each month return to sport was delayed until 9-months after surgery
Almost 40% of those who failed return to sport criteria suffered re-injuries versus 5% of those who passed
More symmetrical quads strength prior to return significantly reduced knee injury rate