Six days before Brian Burns tore the ACL in his right knee, he left SoFi Stadium with his left foot in a walking boot. He didn't practice Wednesday, Thursday or Friday, yet on Sunday he was back on the field against Tennessee.
In the fourth quarter, Burns was rushing quarterback Cam Ward when he planted his right leg while turning the corner. There was contact from the blocker, but when I watch the mechanism, I don't see the type of direct traumatic ACL injury where another player's body simply drives the knee into a vulnerable position. His foot is in the ground, there is relatively minor contact, and the knee gives way.
The Giants have described it as a contact injury, and technically there was contact. From a movement standpoint, however, I think there is much more to consider, particularly when you look at what happened during the six days leading up to the injury.
Six Days Earlier
On Monday night against the Rams, an offensive lineman rolled onto Burns' left ankle. Burns needed assistance getting off the field and initially struggled to put weight through the leg. He eventually walked to the locker room, but after the game he was transported to the team bus with his left foot in a walking boot.
The diagnosis was a low ankle sprain, and Burns was optimistic afterward, describing it as "nothing serious." That may have been completely accurate from a structural standpoint. But nothing serious medically and ready to perform are not necessarily the same thing.
Burns didn't participate in a single practice that week. He missed Wednesday, Thursday and Friday and remained questionable heading into Sunday's game before ultimately being cleared to play six days after the injury.
That's the first part of this story that makes me stop and ask questions.
The Right Knee Fails
Burns didn't start against Tennessee and was reportedly being used situationally. In the fourth quarter, while rushing around the edge, his right foot went into the ground as Tennessee center Austin Schlottmann made contact with him. Burns' right knee gave way, and imaging later confirmed a torn ACL along with a lateral meniscus injury.
There was contact, so I don't think it's accurate to pretend otherwise. But I also wouldn't look at this the same way I would an ACL tear caused by an obvious direct blow to the knee. Burns was planting and attempting to manage significant force through the right leg when the knee failed.
That becomes much more interesting when you consider not only the acute left ankle injury, but Burns' history on the other side.
The Right Ankle Matters Too
At the end of the 2022 season, Burns suffered what was initially diagnosed as a right ankle sprain. He missed Carolina's final regular season game but recovered sufficiently to participate in the Pro Bowl. When soreness continued during the offseason, further testing revealed a small fracture in the right ankle, and in April 2023 Burns underwent surgery performed by foot and ankle specialist Dr. Robert Anderson.
Burns returned and continued playing at an elite level, so we can't assume that surgery left him with a dysfunctional ankle. We don't know what his mobility, strength or mechanics looked like entering this season.
But if I were evaluating Burns, I would absolutely want to know.
The body is remarkably good at finding another way to accomplish a task. If an athlete loses some motion, strength, proprioception or force absorbing capacity somewhere, he doesn't necessarily stop performing. He adapts. Maybe the opposite leg accepts more load, maybe the hip contributes differently, maybe the foot finds another strategy, or maybe another joint takes on movement that used to occur elsewhere.
Elite athletes are particularly good at doing this. Their ability to compensate is part of what makes them elite. The question becomes what happens when you compromise the other side too.
If Burns had even a small residual limitation in his surgically treated right ankle, he may have successfully compensated for it for years without any obvious problem. Then suddenly his left ankle is painful, swollen and restricted. He's in a walking boot Monday night and doesn't practice for the remainder of the week.
Six days later, we're asking his body to produce NFL level acceleration, deceleration, rotation and pass rush forces again.
At some point, you can run out of places to compensate.
Why Ankle Motion Matters to the Knee
This isn't just a theoretical connection.
Research has repeatedly demonstrated that the amount of motion available at the ankle can influence what happens farther up the kinetic chain. One laboratory study found that athletes with greater ankle dorsiflexion landed with greater knee flexion and lower ground reaction forces. Less available dorsiflexion was associated with a stiffer landing strategy and greater forces that the lower extremity had to absorb. Those characteristics matter because reduced knee flexion and greater ground reaction forces have both been implicated in ACL loading.
A systematic review and meta analysis examining ankle dorsiflexion and dynamic knee valgus found a significant association between reduced ankle dorsiflexion and greater dynamic knee valgus. Importantly, that relationship was present across different methods of measuring ankle motion.
That doesn't mean limited ankle dorsiflexion causes an ACL tear. It means that when motion becomes unavailable at the ankle, movement elsewhere can change.
More recent work makes the connection even more interesting. A 2025 study combining movement analysis with musculoskeletal and finite element modeling compared athletes with normal and restricted ankle dorsiflexion during landing. The athletes with restricted dorsiflexion demonstrated higher modeled stresses within the ACL, meniscus and other knee tissues.
Again, that doesn't allow us to look backward and say Brian Burns tore his ACL because of his ankles. But it gives us a legitimate biomechanical reason to ask what motion was available to him when he returned.
What About Taping or Bracing?
I'd also be interested to know how Burns' left ankle was supported when he returned. I suspect that an athlete coming back six days after an ankle sprain, after spending time in a boot and missing the entire week of practice, probably had significant external support through taping, bracing or some combination of the two.
I haven't confirmed that, so this remains a hypothesis.
If he was heavily taped or braced, however, it adds another layer to the discussion. The purpose of taping or bracing an injured ankle is often exactly what we would expect: protect the joint, improve stability and limit unwanted movement. The problem is that the movement demands of the athlete don't disappear simply because we've restricted one joint.
There is research demonstrating this as well. A 2023 study examined healthy participants performing landing tasks with and without ankle taping. Taping significantly reduced ankle dorsiflexion, but the researchers also found increased knee valgus during a drop jump and reductions in lower extremity balance.
That's important, not because it proves taping increases ACL injuries, but because it demonstrates something much more fundamental: when we change motion at the ankle, we can change what happens at the knee.
The research on ankle support isn't completely uniform. Different taping techniques, braces and athletic tasks produce different biomechanical responses, which is exactly what we should expect from a complex system. But the broader point remains that restricting a joint doesn't isolate the effect to that joint.
If Burns' left ankle was already limited by pain, swelling or protective guarding, and then we further restricted its available motion to make it stable enough to play, the rest of his body still had to solve the movement problem.
And Burns wasn't returning to jog in a straight line.
He was returning to rush NFL quarterbacks.
Why His Position Matters
Burns is an edge rusher. His job places enormous demands on the ankle and the entire lower extremity.
He has to explode off the line, accelerate, plant, bend around offensive tackles, rotate, redirect and absorb contact, often while a 300 pound offensive lineman is attempting to move him in the opposite direction.
Ankle function isn't a minor consideration in those movements.
If available ankle motion is compromised through pain, swelling, guarding or external support, the demands of the play don't disappear. The body still has to find the movement somewhere.
That's particularly relevant to the play on which Burns was injured. He was doing exactly what his position requires him to do: rushing the quarterback, turning the edge and managing force through a planted leg.
Maybe We Were Asking the Wrong Question
This is where the return to play decision becomes particularly interesting to me.
It's entirely possible that the primary risk calculation surrounding Burns' left ankle was whether playing would significantly worsen the ankle itself. Maybe the ankle was structurally stable. Maybe there was little concern that playing would turn a relatively minor sprain into a major ligament injury. Maybe Burns could tolerate the pain and passed the appropriate testing.
Under that framework, allowing him to participate could make complete sense.
But this is also where I think sports medicine can sometimes look at the body too much in isolation.
Instead of only asking, "Can he safely play on this ankle?", I think we also need to ask, "What does playing on this ankle do to everything else?"
Pain changes movement. Swelling changes movement. Loss of motion changes movement. Protective guarding changes movement, and external support can change movement. When one part of the system becomes less available, the body has to find another solution.
There is evidence from athletes with chronic ankle instability showing that the biomechanical consequences aren't confined to the ankle. Research has identified altered mechanics at proximal joints during cutting, jumping and landing tasks, providing further reason to consider how ankle dysfunction may influence factors associated with ACL loading.
That doesn't tell us what happened to Burns, but it challenges the idea that the appropriate risk assessment should end at the injured joint.
The Knee May Have Been the Victim
This is where I think we often make a mistake when discussing injuries. We focus almost exclusively on the structure that finally breaks. If an athlete tears an ACL, we look at the knee. If he strains a hamstring, we look at the hamstring. If he tears an Achilles, we look at the Achilles.
But the location of tissue failure doesn't necessarily tell us the entire story of why the system failed at that moment.
The knee sits between the hip and the ankle. Its ability to manage force is influenced by what those joints allow it to do. Research showing relationships between ankle dorsiflexion, knee flexion, ground reaction forces and dynamic knee valgus gives us good reason not to examine these joints independently.
If movement isn't available at the ankle because of pain, swelling, previous injury, protective guarding or external restriction, the forces of the play still have to be managed somewhere.
In Burns' case, we potentially have limitations at both ends of the equation.
On the right, there was a previous ankle fracture and subsequent surgery. We have no evidence that this was still limiting him, but it's something I would want to assess.
On the left, we know there was an acute ankle injury significant enough that he left the stadium in a boot and couldn't practice all week.
Then, six days later, he returned to competition and the right knee failed during a right leg plant.
Maybe those things are completely unrelated.
But I don't think we should assume that.
Ready to Play or Ready to Perform?
An athlete can be medically capable of participating without necessarily being fully prepared to perform. Swelling may have decreased, imaging may be reassuring, ligament testing may be acceptable and pain may be tolerable. None of those things necessarily tell us how the entire athlete will organize movement at game speed.
For an edge rusher, that distinction matters enormously. Burns has to accelerate, plant, bend around an offensive tackle, absorb contact, rotate and redirect while producing enormous amounts of force from compromised positions.
Being able to tolerate an ankle sprain is very different from demonstrating that the entire system can once again manage those demands.
That's why the lack of practice catches my attention. If Burns didn't participate in practice all week, when did he demonstrate those abilities under meaningful football loads?
Perhaps the Giants tested all of this privately during rehabilitation. We don't know, and I don't want to pretend we know what happened inside their medical department.
But I think it's a fair question.
This Is Where Reconditioning Comes In
Rehabilitation understandably focuses on the injured structure. Reconditioning has to go further.
If Burns were in front of me after that left ankle injury, I wouldn't only want to know whether the ankle was structurally stable or whether his pain was tolerable. I'd want to know what happened to his entire movement strategy.
I'd want to measure available dorsiflexion on both sides, particularly given his right ankle history. I'd want to know whether the left ankle could accept and redirect force and whether the right ankle could adequately dorsiflex and rotate under load. I'd want to know whether his right leg loading had changed because he was protecting the left and what happened if the injured ankle was taped or braced.
Then I'd want to progressively introduce the things his job actually requires: speed, fatigue, contact, rotation, planting, edge bending and changing direction.
Most importantly, I'd want to know whether he still had enough movement options available when something didn't go perfectly.
Because football isn't played in controlled rehabilitation drills. Someone bumps you, your foot lands slightly differently, your center of mass gets displaced or another player redirects you. A resilient athlete needs enough options available to solve those problems.
My concern with returning an athlete this quickly isn't simply whether the injured ankle can tolerate the game. It's whether the injury has reduced the athlete's available solutions.
Were We Evaluating the Ankle or the Athlete?
Brian Burns may have torn his ACL regardless of what happened to his left ankle six days earlier. ACL injuries are multifactorial, and there was some contact on this particular play. We need to acknowledge that.
The research doesn't allow us to draw a straight line from restricted ankle motion to ACL rupture. What it does tell us is that ankle motion influences knee mechanics, and restricting ankle dorsiflexion can alter knee position, force absorption and, in experimental models, even ACL loading.
That makes the timeline difficult for me to ignore.
Why was an athlete who left the previous game in a walking boot and didn't practice once during the week playing six days later?
Perhaps there is a perfectly reasonable answer.
What I would want to know is how the risk was evaluated. Was the question simply whether Brian Burns could play without significantly worsening his left ankle injury? Or was the question whether Brian Burns' entire movement systemwas prepared to manage the demands of professional football?
Those aren't the same question.
With his previous right ankle history, did the new left ankle injury remove some of the compensatory strategies that had allowed him to perform? If the left ankle was taped or braced, did further limiting available motion change how forces were distributed? Was the right knee ultimately asked to solve a movement problem that the rest of the system could no longer adequately solve?
We may never know.
But when an athlete suffers one injury and returns almost immediately only to sustain a devastating injury somewhere else, I don't think we should automatically label the two events unrelated simply because they involve different joints.
The body doesn't operate as a collection of independent parts.
Were we assessing the risk to Brian Burns' injured ankle, or were we assessing the risk to Brian Burns?
Sometimes the structure that finally breaks may simply be where the body ran out of options.
