5 Ways to Help Reduce Your Risk of an ACL Injury
Most ACL tears happen without any contact at all. That means most of them are also trainable — here's where to focus.
Many ACL injuries happen without contact, often during cutting, landing, or pivoting movements. The good news? Training proper movement mechanics, improving strength, and building stability can help reduce the risk.
Roughly 80% of ACL tears are non-contact injuries — no collision, no opposing player clipping a knee. Just an athlete planting, cutting, or landing the wrong way. That's a hard thing to hear as a parent or coach, because it means the injury often isn't a fluke. It's frequently the result of a movement pattern that broke down under speed, fatigue, or an awkward landing — which also means it's a pattern that can be trained.
Common risk factors include:
Sudden direction changes or cutting movements
Landing from a jump with poor mechanics
Fatigue late in practice or games
Below are five ways to train against each of those risk factors — and a couple more that belong in any serious ACL-prevention plan.
Quick stats: ~80% of ACL tears are non-contact injuries. 4–6x higher ACL injury rate in female athletes in cutting/jumping sports. 43–73% lower injury risk with structured training programs.
Train Deceleration and Cutting Mechanics
Sudden direction changes and cutting movements are one of the most common moments an ACL tears. When an athlete plants hard and pivots with a straight, stiff leg or a knee that caves inward, the ligament absorbs a load it was never designed to handle.
The fix isn't to cut less — it's to cut smarter. Deceleration drills that teach athletes to bend the knees and hips, widen their base, and keep the knee stacked over the foot on a plant give the ACL a much safer angle to work from. This is technique, and technique can be coached.
Teach Proper Jump-Landing Mechanics
Landing from a jump with poor mechanics is the other half of the newsletter's warning — and for good reason: more than 70% of non-contact ACL injuries happen on landing, not in the air. The danger moment is that split second after the feet touch down, when the knee can collapse inward into what clinicians call the "position of no return."
Athletes who are taught to land soft — knees bent, chest up, weight balanced over both feet instead of collapsing to one side — put dramatically less strain on the ACL. This is a trainable habit, not a matter of luck or natural coordination.
Manage Fatigue Before It Becomes a Risk Factor
Fatigue late in practice or games is the third risk factor called out in our newsletter, and the biomechanics back it up. As muscles tire, athletes naturally bend their knees and hips less on landing and generate more force straight down through the joint — exactly the combination that puts the ACL at risk.
This is why a disproportionate number of ACL injuries happen in the second half or the final minutes of a game. Building genuine strength endurance, not just sprint speed, and being honest about rest and recovery between high-intensity sessions is part of injury prevention, not separate from it.
Build Single-Leg Strength and Stability
Most sports happen on one leg at a time — cutting, landing, decelerating — yet most off-season strength work is still done two legs at once. That gap matters, because side-to-side strength and control differences are one of the most consistent predictors of who gets hurt.
Single-leg squats, step-downs, and Romanian deadlifts, along with hip and glute strengthening, close that gap. The goal isn't just stronger legs; it's legs that can control the knee independently when the other foot is off the ground — which is exactly the position an ACL tears from.
Follow a Structured Program, Consistently
None of the above works as a one-time lesson. Research on structured neuromuscular training programs — combining strength, plyometrics, agility, and balance work — shows a 43% to 73% reduction in ACL injury risk, but only when the program is run consistently: 2 to 3 sessions a week, for at least 8 to 12 weeks, as part of warm-ups rather than an extra thing bolted on.
Skipping the warm-up program when the team is short on time is one of the most common ways this protection quietly disappears.
Why it matters long-term: as many as 18% of athletes 20 and younger who return to high-risk sport after an ACL reconstruction go on to tear it again. Prevention work doesn't stop mattering once an athlete is cleared — if anything, it matters more.
Why One Nine Is Different
Most clinics are built around getting patients out of pain and off their caseload. One Nine was built around a different question: is this athlete actually ready to compete again — not just tolerate activity?
Every session is one-on-one with a Doctor of Physical Therapy — never passed off to aides or a generic protocol.
Every plan is 100% personalized and sport-specific to how your athlete actually moves and competes.
We measure readiness with real data — forceplates, dynamometers, and speed timing gates — instead of guessing.
We treat the root cause, not just the pain — because a "quiet" body isn't the same as a ready one.
That's the gap where most reinjuries live, and it's the gap we're built to close.
If your athlete plays a cutting or jumping sport, a sports performance assessment is one of the highest-value visits you can schedule.
Schedule a Sports Performance Assessment with One Nine → https://onenine.janeapp.com/
