About MCL sprain
The medial collateral ligament (MCL) runs along the inner side of the knee and keeps the knee from bending inward. It is one of the most commonly injured knee ligaments, especially when something hits the outside of the knee or the knee collapses inward during a fall or tackle.
MCL sprains are graded by severity. A grade 1 sprain is a stretch with little looseness, grade 2 is a partial tear with some looseness, and grade 3 is a complete tear. Unlike the ACL, the MCL has a good blood supply and usually heals well with protection and rehab.
A higher-grade MCL injury sometimes happens along with an ACL or meniscus tear, so a careful exam matters even when the pain seems limited to the inner knee.
Common symptoms
- Pain and tenderness along the inner side of the knee
- Swelling over the inner knee
- A feeling of looseness or opening on the inner side with side-to-side stress
- Pain with twisting, cutting, or pushing off
- Bruising along the inside of the knee in more severe sprains
Common causes and risk factors
- A blow to the outside of the knee, common in football, soccer, and rugby
- The knee collapsing inward during a fall or awkward landing
- Skiing falls where the ski tips spread apart
- Twisting injuries with the foot planted
How we diagnose it
Our physicians examine the knee for tenderness, swelling, and how much the inner side opens under gentle stress. Diagnostic ultrasound at the exam table shows the MCL directly, so we can see whether it is stretched, partly torn, or completely torn and where along the ligament the injury sits. When the exam raises concern for an ACL or meniscus tear, or when the knee is very unstable, we refer for an MRI, and an X-ray is ordered if a fracture is possible.
How Propel treats MCL sprain
Most MCL sprains are treated with a hinged knee brace that protects the ligament while still letting the knee move. Early rehab restores motion and quadriceps strength, then progresses to balance, side-to-side movement, and sport-specific drills. We adjust activity so you stay as active as the ligament allows and use repeat ultrasound when it helps to track healing.
For selected grade 2 or grade 3 sprains that are slow to heal, or that stay painful at the ligament's attachment, ultrasound-guided PRP may support the healing process. Complete tears combined with other ligament injuries, or knees that remain unstable despite bracing and rehab, may need a surgical opinion, and we refer to trusted orthopedic surgeons when that is the better route.
What to expect at your visit
- 1.
We listen first
Your visit opens with a real conversation: how the problem started, what you have already tried, and the activity you want back.
- 2.
Exam and in-office ultrasound
A hands-on exam, then ultrasound at the exam table, often while you move, so your physician can see the tendon, joint, or nerve involved.
- 3.
A clear diagnosis and plan
You leave knowing what is wrong and what your options are, from strength-based rehab to procedures, and why we recommend each one.
- 4.
Treatment and follow-through
Most procedures happen here in the office. We coordinate with your physical therapist and check progress against the goals you set.
Questions about MCL sprain
- Do I need to wear a brace for my MCL sprain?
- For most grade 2 and grade 3 sprains, a hinged brace is helpful because it protects the inner knee while you move and strengthen. Mild grade 1 sprains may not need one. We tailor bracing to the grade seen on exam and ultrasound.
- Can I walk on a sprained MCL?
- Usually yes. Most people can bear weight as comfort allows, sometimes with a brace or crutches for a short period. Walking and gentle motion generally help the ligament heal better than complete rest.
- Will my MCL tear need surgery?
- Most isolated MCL tears, including many complete ones, heal without surgery. Surgery is more often considered when the MCL is torn along with other ligaments or when the knee stays unstable after a full course of bracing and rehab.