Dr. Jason Lunden // #FitnessAthleteFriday // www.ptonice.com  In today's episode of the PT on ICE Daily Show, Endurance Athlete Division Leader Jason Lunden discusses helping patients return to running following ACL reconstruction (ACLR). Jason describes healing & strength benchmarks to use to initiate running, strengthening needed to facilitate return to running, and biomechanical changes that need to be addressed to improve performance. Take a listen to the episode or check out the full show notes on our blog at www.ptonice.com/blog If you're looking to learn from our Endurance Athlete division, check out our live physical therapy courses or our online physical therapy courses. Check out our entire list of continuing education courses for physical therapy including our physical therapy certifications by checking out our website. Don't forget about all of our FREE eBooks, prebuilt workshops, free CEUs, and other physical therapy continuing education on our Resources tab. EPISODE TRANSCRIPTION JASON LUNDENHey, good morning, everyone. Welcome to another edition of PT on ice daily show. My name is Jason London. I am the endurance or the endurance athlete division lead. And I am happy to be chatting with you all today. We'll be talking about return to run following ACL reconstruction. Sorry that I'm on a little late. I just wanted to avoid my dogs going crazy when my daughter was getting picked up. So for those of you who are patiently waiting since seven, thanks for your wait. So we're going to be talking about return to run following ACL reconstruction, covering, you know, why do we care? when that happens and why do we need to be thoughtful about that, what do we look for as our athletes are returning to run, and then how do we address it. So one, why do we care? Well, several different reasons. First and foremost, performance. We want to set our athletes up for success with when they're returning to run and being able to demonstrate good mechanics for performance, but also We do want to be thoughtful of that healing ACL graft and as it is going through the ligamentization phase, we want that to have basically been gone through that full phase before return to run just because of the stresses placed on the ACL with plyometrics, even though running itself in healthy adults should have very low stress on the ACL. And then third, probably the most important piece with really being cognizant of what's going on with their gait mechanics is a high rate of early onset osteoarthritis following ACL reconstruction. And with that, there's been studies looking that have shown that It really comes down to one of the risk factors is patients who under load the operative side seems to be one of the driving factors for early onset arthritis. So it's going to be something that you want to look for. CHANGES IN MECHANICS FOLLOWING ACLR So what do we look for in these patients who are returning to run following ACL reconstruction? Well, the main things that we see in the literature and then I would say I see in the clinic as well is, um, I'm jumping ahead here a little bit. But what we want to look for is those patients that are underloading the knee, so decreased knee flexion on the operative side in the sagittal plane at mid stance compared to the on operative side. So any difference greater than two degrees of knee flexion at mid stance is something that we need to address. That patient is underloading that knee. And then the second thing, particularly for patients following a hamstring autograft, semi-T, semi-membranosis autograft, is increased tibial external rotation during stance, which has been shown to be in the literature. Now, I jumped ahead there a little bit. WHEN CAN WE RETURN TO RUNNING? You know, when are we actually allowing these patients to return to run? Again, we want the graft to have gone through the ligamentization phase. So that is going to be at four months, anywhere between three and four months. But to be on the