Interesting study. Previously studies like this have been based on general population with widely varying rehab programs and questionable functional testing which skewed the stats. Our doc and PTs insisted that rigid adherence to time-frames is not the right way to prescribe rehab activities or assess readiness to return to play. There are just too many factors involved.
Even with all of the factors involved, the study clearly shows that the tendon just needs time to become the new ACL. As I stated earlier, we know of many who went back to the playing field prior to the 9 month threshold and suffered reinjury. We do not know of anyone that waited at least 9 months to return that has suffered reinjury. Its always better to error on the side of caution.