APEX PWR | Physical Therapy Feature
Monday night, on the Giants' opening drive against the Rams, Jaxson Dart got hit mid-throw by two defenders. His left knee bent in a direction knees do not like while his foot was still off the ground. He walked off under his own power, which is usually a good sign, and Jameis Winston finished the game.
Afterward, Giants head coach John Harbaugh said they were hoping it landed "in the neighborhood" of an MCL sprain. That is coach-speak for please let it be the one you can come back from.
Tuesday's imaging came back worse than they hoped.
Nothing is final. After Tuesday's MRI, ESPN reported Dart is facing the possibility of season-ending knee surgery. Harbaugh's public line has been that evaluations are ongoing and no decision has been made. Things look bad, and it is a real possibility his season is over.
We are not in that building, we have not evaluated him, and we have not seen the imaging. So this article is not a diagnosis of Jaxson Dart. It is what we do know, about these two ligaments and about the decisions that follow them.
There is one more thing worth putting on the table before the anatomy, because it explains a lot of what you are about to read in the coverage.
Dart is young, he is under a rookie contract, and he is the piece that franchise is building around. When that is true, the decision stops being purely medical. A team in that position takes the cautious road almost every time, and they should. If the choice is between playing him in December of a season that is not going anywhere and having him whole in 2027, that is not a close call. So if the Giants end up holding him out longer than the injury strictly requires, do not read that as the injury being worse than reported. Read it as an organization doing the math on a twelve-year career instead of a twelve-game season.
People use "knee injury" as if it is one thing. Inside the joint there are four main ligaments doing four distinct jobs, and two of them get most of the airtime.
The MCL, the medial collateral ligament, runs down the inside of your knee, connecting the thigh bone to the shin bone. Its job is to stop the knee collapsing inward. When a defender hits the outside of a planted leg and the knee buckles toward the other one, the MCL is the structure that takes it.
The ACL, the anterior cruciate ligament, runs diagonally through the middle of the joint. Its job is to stop the shin sliding forward on the thigh and to control rotation. It is the ligament that keeps the knee honest when you plant and cut.
Here is the part that decides almost everything downstream, and it is anatomy rather than severity.
| MCL | ACL | |
|---|---|---|
| Where it sits | Outside the joint capsule | Inside the joint, in synovial fluid |
| Blood supply | Good. It can form a clot and scar down | Poor, and the joint fluid interferes with clotting |
| Does it heal on its own? | Usually yes, across all three grades | Usually no once fully torn |
| Typical mechanism | Contact. Force to the outside of the knee driving it inward | Often non-contact. Decelerating, cutting, landing awkwardly |
| What it feels like | Pain and tenderness along the inside of the knee, a feeling of the knee wanting to give inward | Often a pop, rapid swelling within hours, a sense the knee has come apart underneath you |
| Usual management | Bracing and structured rehabilitation | Reconstruction for most athletes returning to cutting sport |
| Typical time frame | Weeks, by grade | Nine to twelve months, often longer |
That is why "we're hoping it's the MCL" is one of the most loaded sentences in sports. The two injuries are not on the same scale. They are on different calendars entirely.
"MCL injury" on its own tells you almost nothing about a timeline. The grade does. Grading comes from a hands-on exam, where a clinician applies a gentle inward force to the knee and feels how far it opens and whether there is a firm endpoint at the end of that motion, confirmed with imaging.
| Grade | What happened | On examination | Typical return |
|---|---|---|---|
| Grade 1 mild | The ligament is stretched with microscopic tearing. Structurally intact. | Tender on the inside of the knee. Joint stays stable, firm endpoint. | About 1 to 3 weeks |
| Grade 2 moderate | A partial tear. Some fibers are through, some are not. | Noticeable looseness, but still a firm endpoint. Usually more painful than grade 3. | About 3 to 6 weeks |
| Grade 3 complete | A complete tear through the ligament. | Clear instability, no firm endpoint. Most likely grade to involve other structures. | 6 to 12 weeks or more |
Two things about that table that surprise people.
A grade 3 can hurt less than a grade 2. When a ligament tears completely, the pain fibers running through it go with it. Plenty of athletes have walked off a field on a fully torn MCL feeling weirdly fine. Pain is a terrible proxy for damage in the first hour.
Even a grade 3 MCL usually does not need surgery. That is the blood supply doing its job. Where surgery enters the conversation is when the MCL is not alone. The MCL and ACL are frequently injured together, because the force that drives a knee inward is often the same force that rotates it. When both are gone, you are no longer managing an MCL problem.
That is the specific fear in a case like Dart's, and it is why a team does not announce anything off a sideline look. The MCL question can be answered by hand in about ninety seconds. What else came with it takes an MRI, and sometimes a re-read of that MRI a few days later once the swelling settles and the picture gets clearer.
The first report on a knee is a guess made in bad conditions. The second one is information. Do not build your plan on the guess.
Our Director of Rehab breaks it down in under a minute.
I hurt my MCL in the NFL. Mine was on the low end of the scale, I took about two weeks off, and I played the rest of the year with it. So if you want somebody to tell you an MCL is survivable, I am a reasonable person to ask.
I am also going to tell you it was not fun. There is a specific thing about a medial knee injury that people who have not had one do not understand. It is not the pain when you are running straight. It is the moment you have to change direction and plant on that leg, and some part of your brain that you do not get a vote on asks whether the knee is going to hold. You answer that question a few dozen times a day, in front of coaches who are evaluating you, and you are never fully sure of the answer.
And here is the part that matters for reading what happens to Dart, because our situations are not comparable.
I played tight end. A lot of what I did was linear. Get off the line, run the route, block a man who is right in front of me. Yes there are cuts in that, but the worst-case demand on my knee was mostly predictable and mostly in front of me.
A quarterback is a different animal now. Dart is asked to climb a collapsing pocket, reset his base, throw across his body off a leg that is moving, escape, and take hits while his feet are in the air, which is exactly how he got hurt. The rotational and lateral load on a modern quarterback's knee is far higher than what my position ever asked of mine. Same ligament. Not the same job.
Layer on that he is young and that franchise is building around him, and you should expect the Giants to be careful with him. If it were me at that stage of a career, with what I know now, I would want somebody being careful with me too.
Because here is what I actually learned, and it took me two knee surgeries and a blown ankle before the Combine to learn it: the surgeries did not set me back. Being in a hurry did.
Most of the knees we see in Tigard belong to high school athletes, weekend skiers, rec league soccer players and adults who planted wrong on a hike at Forest Park. The ligaments are identical. The stakes are different and the mistakes are the same.
If you tore something more than a year ago, finished rehab somewhere else, and have felt a step slow ever since without being able to name why, that is the most common story we hear. It is usually not the ligament. It is the strength and confidence nobody ever rebuilt on that side.
Sports physical therapy in Tigard, Oregon, with objective return-to-play testing and the training floor on the other side of the same room. Serving Tigard, Beaverton, Portland, Lake Oswego and Tualatin.
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