Your anterior knee pain might not be coming from your knee.
Anterior knee pain is one of the most common complaints I see in the clinic. Runners, cyclists, skiers, weight lifters, hikers. Pain at the front of the knee, sometimes vague and diffuse, sometimes pinpoint around the kneecap. Sometimes a quick google search will say it is patellofemoral pain, runner's knee, jumper's knee, or some flavor of tendinitis. Often they have already tried rest, ice, a brace, maybe a cortisone injection.
And many of them are still in pain when they walk through our doors.
When we put hands on these athletes, what we find frequently is that the knee itself is not the source of the pain. The pain is being referred from trigger points in the muscles of the thigh. The knee is just where the symptoms show up.
What is a trigger point and why does it refer pain
A trigger point is a small, hyperirritable spot within a taut band of muscle. When you press on one, two things happen. First, the spot itself is tender. Second, and this is the part most people miss, it sends pain to a predictable location somewhere else in the body. This referred pain pattern is well documented and has been mapped out extensively in the literature by Travell and Simons.
The pattern is not random. The same trigger point in the same muscle will refer to the same area across different people. This is what makes them clinically useful. If we know where the pain is, we know which muscles to check.
For anterior knee pain, there are a handful of usual suspects.
The muscles most likely referring to your knee
Vastus medialis. A trigger point in the lower portion of this muscle, just above the medial side of the kneecap, refers pain directly to the front and inside of the knee. This is one of the most common patterns we see and is often mistaken for medial joint line pain or a meniscus issue. The athlete will point right at the inside of the knee and swear something is wrong inside the joint. We will then press on a spot four inches above where they are pointing and reproduce their exact symptoms.
Rectus femoris. This is the quad muscle that crosses both the hip and the knee. A trigger point near its origin at the hip refers pain down to the front of the knee, especially right around or just above the kneecap. Common in runners and cyclists who spend a lot of time with the hip in a flexed position.
Vastus lateralis. Trigger points along the outside of the thigh in the vastus lateralis refer pain to the outside of the knee and can also feel like ITB pain or lateral patellar pain. Common in athletes who load the lateral quad heavily, mountain bikers and skiers in particular.
Adductor longus and magnus. Less obvious but worth checking. Trigger points in the adductors can refer pain to the medial knee and even into the joint itself. Athletes with groin tightness and anterior medial knee pain often have a piece of this going on.
Why this matters
If your pain is being referred from a trigger point and you treat the knee, you will not get better. You can ice the knee, sleeve it, ultrasound it, inject it. The knee will keep hurting because the source is upstream.
This is one of the reasons we see athletes who have been chasing anterior knee pain for months or years without progress. They have been treating where it hurts instead of where it is coming from.
It is also worth saying that trigger points are usually a symptom of something larger. A muscle does not develop a chronically irritable spot without a reason. The reason is almost always a movement pattern, a strength imbalance, or a load issue that the tissue cannot tolerate. So while clearing the trigger point will often resolve the pain quickly, the work is not done. You still have to figure out why that muscle was getting overworked in the first place.
How to check this yourself
Before you assume your knee is the problem, spend a few minutes investigating your thigh.
Press on the lower vastus medialis. Find the soft tissue just above the inside of your kneecap and work upward four to six inches. Press firmly into the muscle and even knee gently flexing and extending the knee. If you find a tender spot that reproduces your knee pain or sends a sensation toward the knee, you have likely found a contributor.
Check the rectus femoris near the hip. In prone, rolling along the center of the thigh with rotating side to side to explore. You may be surpised the find muscles in this area can refer symptoms to the knee.
Roll the lateral quad. Side lying on a foam roller, work slowly through the outside of the thigh. Spots that send a referral toward the knee or down the leg are worth marking.
Check the adductors. Lying prone leg out to the side, foam roller on the inner thigh. Explore rolling up and down and also try rotating the femur in and out to find tender areas.
If you reproduce your knee pain by pressing on something that is not your knee, good news, you can start treating that right away.
Here are some examples of how we like to roll on these areas.
What to do about it
Soft tissue work on the offending muscle is the fastest way to settle the referred pain. Foam rolling, lacrosse ball, instrument assisted soft tissue mobilization, dry needling, manual therapy from a clinician. All of these work. The goal is to decrease the trigger point activity to get a more clear picture of what pain may be coming from the knee vs the trigger points.
But again, soft tissue work alone is rarely the full answer. Once the pain is quiet, the next step is figuring out why the muscle got overworked in the first place. That is where strength work, mobility, and movement retraining come in.
If you have been treating the front of your knee for months with no progress, take a closer look at the quads and adductors. The knee may just be the messenger.
