MCL Tears: What Athletes Need to Know
As athletes, we spend a lot of time thinking about performance, recovery, and injury prevention. But when knee pain shows up, especially on the inside of the knee, it can (and should) change training quickly. Especially after a big injury that causes swelling in the joint and, sometimes, instability.
One of the more common ligament injuries in grappling is an MCL tear. The good news is that many of these injuries do well without surgery. This does not mean returning to full competition rounds 1 day later. Depending on the severity, this still requires aggressive physical therapy. The challenge is knowing when an MCL tear is truly a lower-grade injury, when it needs more attention, and how to return to sport without rushing the process.
What the MCL Actually Does and How it is Injured
The medial collateral ligament, or MCL, is one of the major stabilizers of the knee. It helps resist valgus (knee going inwards) stress and supports stability on the inner side of the joint. Because of that role, the MCL is vulnerable during contact, twisting, sudden directional changes, or positions where the knee is forced inward (think kani basami/scissor takedowns and tani otoshi). If you have an MCL tear, you may feel pain along the inside of the knee, loss of confidence in the joint, and difficulty with cutting, pivoting, or loaded movement. The knee often swells up as well.
Not every MCL injury is the same… Why the Grade of Injury Matters.
Medical professionals often say “MCL sprain” and in my eyes, this is the same as “tear”. There are just different grades of tearing.
Incomplete tears, meaning grade I and grade II injuries, are often treated successfully without surgery. Even isolated grade III tears may still be managed nonoperatively when there is no significant valgus instability. That distinction matters, because treatment decisions are driven less by the label alone and more by instability, alignment, tissue quality, and whether other structures are involved. It is extremely RARE for an MCL tear to require surgery.
This is one reason a proper evaluation matters. History and physical exam are often enough to strongly suspect the diagnosis, but MRI is considered the gold standard when a more complete picture is needed.
What Early Treatment Usually Looks Like
Lower-grade injuries and many isolated MCL tears respond well to early functional rehabilitation. That said, the literature also shows that rehab protocols are not perfectly standardized. A recent systematic review found substantial variation in nonoperative treatment, including inconsistent use of braces and limited detail in many published rehab programs.
Here is how I see early treatment… no live rolling until you are evaluated by a medical professional. Get on a stationary bike immediately. Not to kill the bike, but to get full range of motion, keep the quads lightly firing, and decrease swelling.
When Surgery Enters the Conversation
Surgery is not the default for most isolated MCL injuries, but it does have a role. When other ligaments are ruptured in addition to the MCL (like the ACL and PCL in addition to a significant MCL injury), then surgery may be discussed.
More significant isolated tears may need surgery, particularly when there is severe valgus alignment, entrapment of the ligament, large bony fractures, or chronic instability after failed nonoperative care. Reconstruction or repair is relatively uncommon overall, because many athletes can return to prior function with non-surgical management.
This is where people get into trouble by assuming every tear needs surgery or, on the other side, assuming every tear can simply be ignored. The real answer depends on stability, associated injuries, and how the knee responds over time.
Where Rehab and Return to Sport Fit In
A comprehensive rehabilitation program is critical to outcome after MCL injury. The goal is not only to get rid of pain, but to restore function, rebuild confidence, address risk factors, and reduce the chance of future injury.
What is important to understand is that there is no single universal rehab template that works for every athlete. The literature supports the importance of rehab, but also highlights that high-level comparative studies on exact rehab protocols are still lacking. So the best return-to-sport plan is one that is individualized to the severity of the injury, the sport, and the demands placed on the knee. This is why it is critical to seek help from a well qualified physical therapist.
One of my mentors gave me some helpful advice once. Approximate return to sport for MCL tears can be broken down depending on grade of tear:
Grade I (3-5mm gapping) = 1-3 week
Grade II (6-10mm gapping) = 4-8 weeks
Grade III (>10mm gapping) = 8+ weeks
My return to sport criteria are as follows… I tell my patients they must have ALL of the following for me to clear them:
Full range of motion (equal to the opposite leg)
No swelling
No pain over the ligament
Full strength (equal to the opposite leg)
A Practical Approach for Athletes
If you think you have an MCL injury, the goal should not be to prove how tough you are by pushing through it immediately.
The goal is to figure out how stable the knee is, whether this is an isolated injury, and what kind of rehab progression gives you the best chance of returning well. Many athletes do very well without surgery, but they do best when the injury is respected early and managed with a functional plan instead of guesswork.
The biggest mistake is thinking “I don’t need surgery, so I don’t need rehab… therefore I’ll just keep doing my intense training”. This mentality often keeps grapplers at 50-80% for months to years instead of following my return to sport timeline above, getting back to 100% way sooner.
Final Thoughts
MCL tears are common, especially in athletes, but they are not all created equal.
Many can be treated successfully with conservative care and early rehabilitation. Some need closer imaging, a more cautious progression, or even surgery. The key is not just getting back to movement quickly. The key is returning with a knee that is stable, trusted, and prepared for the demands of your sport without wasting time in the chronic injury loop.
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Dr. Megan Lisset Jimenez
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References:
Azar FM. Isolated medial collateral ligament tears: An update on management. EFORT Open Rev. 2018.
Naqvi U, Sherman A, et al. Review: Medial collateral ligament injuries. J Orthop. 2017.
Svantesson E, et al. Shedding light on the non-operative treatment of the forgotten side of the knee: rehabilitation of medial collateral ligament injuries—a systematic review. BMJ Open Sport Exerc Med. 2024.
Wijdicks CA, Ewart DT, et al. Return to Play After Medial Collateral Ligament Injury. Clin Sports Med. 2016.
