🎓 Insiders Academy - https://fitnesspainfree.com/programs/fpf-insiders/ 🧠 ACL Rehab Master Course [Mike Reinold & Kevin Coughlin] https://mikereinold.com/acl-rehab-masterclass/ 📌 FREE Guide - ACL-Reconstruction Evidence Based Exercise "Cheat Sheet" https://fitnesspainfree.com/acl-reconstruction-exercise-prescription-cheat-sheet-lead-magnet/ Thanks for watching! Are knee extensions bad after ACL reconstruction? For years, clinicians have been told to be careful with open kinetic chain knee extensions after ACL-R because of concerns about anterior tibial translation, ACL graft strain, and potentially increasing graft laxity. But does the research actually support avoiding knee extensions? In this video, I break down the evidence on **open kinetic chain knee extension after ACL reconstruction** and, more importantly, how I think physical therapists should actually apply this information in the clinic. We’ll cover: • Why knee extensions place strain on the ACL graft — and why that isn’t necessarily a bad thing • Open vs. closed kinetic chain ACL loading • Why restoring quadriceps strength is so important after ACL-R • Research comparing closed-chain rehab with combined open + closed-chain strengthening • Whether early knee extensions actually increase ACL graft laxity • How range of motion changes ACL strain during knee extension • Why walking may actually strain the ACL more than lightly loaded knee extensions • How graft ligamentization should influence our thinking • Criteria for introducing open kinetic chain strengthening • How I progress quad loading during the first 4+ weeks after ACL reconstruction • Where BFR, isometrics, squats, and supine knee extensions fit into the progression The big takeaway? **Knee extensions aren't inherently “bad” after ACL reconstruction.** The more useful question is: **When should we introduce them, through what range of motion, with how much load, and does the knee currently tolerate that stress?** We need to respect graft biology, joint effusion, range of motion, the graft harvest site, and the patient's overall irritability — while also recognizing that being too conservative with quadriceps strengthening can create its own problems. If your athlete is several months into ACL rehab and still has a massive quadriceps deficit, simply avoiding knee extensions probably isn't helping them. This is where criteria-based progression matters. 📚 **FPF INSIDERS ACADEMY** Want more practical, evidence-based rehab education like this? Fitness Pain Free Insiders Academy is my online membership for physical therapists and rehab professionals. You’ll get access to a growing library of courses, clinical resources, case studies, CEUs, rehab protocols, and the ability to submit questions that I may turn into deep-dive videos just like this one. 👉 Join FPF Insiders Academy for just $1: https://fitnesspainfree.com/programs/fpf-insiders/ 🏋️ **ACL REHAB RESOURCES** Want the exact exercise progressions, sets, reps, testing, and criteria we use throughout ACL rehabilitation? 👉 ACL Rehab Course / Resources: https://mikereinold.com/acl-rehab-masterclass/ ⏱️ **TIMESTAMPS** 00:00 – Are Knee Extensions Bad After ACL Reconstruction? 01:28 – Open vs. Closed Kinetic Chain Exercises 03:22 – Why Clinicians Worry About Early Knee Extensions 04:40 – Why We NEED Open Kinetic Chain Strengthening 05:10 – Quad Strength & Knee Re-Injury Risk 07:01 – What the ACL Rehab Consensus Recommends 08:09 – Early Knee Extension Research After ACL-R 10:32 – Starting Knee Extensions at 4 Weeks 13:00 – A Major Limitation of the Research 16:03 – Quad Strength Results: Open vs. Closed Chain 17:09 – Hamstring Strength Results 18:13 – Did Knee Extensions Increase ACL Graft Laxity? 18:43 – Criteria for Starting Open Kinetic Chain Exercise 20:30 – How Early Can We Start Knee Extensions? 22:18 – Walking vs. Knee Extension ACL Strain 24:13 – Using ROM to Reduce ACL Graft Strain 25:34 – When Is the ACL Graft Actually Weakest? 29:38 – Quad-Biased Squats After ACL Reconstruction 31:41 – Closed Chain Doesn't Automatically Mean “Safe” 32:50 – Supine Knee Extensions for ACL Rehab 33:45 – BFR + Low-Load Quad Strengthening 36:09 – Weeks 0–2: Practical Quad Progressions 38:21 – Weeks 2–4: Progressing Knee Extensions 39:00 – Week 4+: Loading the Quadriceps Harder 40:08 – Final Clinical Takeaways If you’re a physical therapist, athletic trainer, strength coach, or other rehab professional working with ACL reconstruction patients, let me know in the comments: **When are you currently introducing knee extensions after ACL-R?** And if you have another rehab question you want me to break down, drop that below too. #ACLRehab #ACLReconstruction #PhysicalTherapy #KneeRehab #QuadricepsStrength #SportsPhysicalTherapy