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Knee pain

Pain at the front of the knee: why waiting rarely works and what actually helps

By Milan Subošić, physiotherapist  ·  October 8, 2026

You climb the stairs and something stabs at the front of your knee. Or you sit through an hour-long meeting, stand up, and the knee feels locked. Squats, downhill walking, running: all of it can hurt now, and the scan, if you had one, doesn't say anything serious.

If this sounds familiar, you are not alone. Pain at the front of the knee is most often what is called patellofemoral pain: pain around or behind the kneecap that shows up when the knee carries load in a bent position. Older names are chondromalacia patellae and “runner's knee.” It affects roughly one in four adults (about 23%) in a given year, and nearly three in ten adolescents (about 29%). It is a well-understood condition and there is a clear plan for dealing with it.

Not every pain at the front of the knee is the same

Most people have patellofemoral pain, but not everyone. Pain at the front can also come from the patellar tendon, and sometimes from the hip, because hip pain can be felt on the inner side of the knee. After a direct blow to the knee, a ligament injury should also be considered. That is why you start with an assessment, not with treatment.

It isn't just a “weak muscle”

You often hear that the culprit is a weak quadriceps or a kneecap that “doesn't track properly.” The story is more complicated. It is a condition with several contributing factors, and experts who have worked with it for years describe it as a problem of load distribution. The knee has its own capacity. When you outgrow it (one of my favorite mentors, and a man whose work I greatly respect, David Poulter, described this very well as “The rule of TOO's - TOO MUCH, TOO SOON, TOO HARD, TOO OFTEN”), whether through a new training plan, a downhill walk, lots of stairs or hours of sitting with a bent knee, it starts to send a pain signal. That is why it hurts in certain situations and not all the time.

It is also why something that seems minor can help. One of the questions at an assessment is whether the pain changes when you change your shoes. If it does, that is a valuable clue.

Noisy knees

Many people are most bothered by the sound: creaking, crunching, as if bone were grinding on bone. In one study comparing 165 women with pain and 158 without, the noise was about four times more common in those with pain, but it was not related to knee function, activity level, or pain on stairs and squatting. Research into what people believe about that sound, including work by the British physiotherapist Claire Robertson, shows that fear of the noise can lead to avoiding movement, which is exactly what the knee likes least.

Why waiting for it to pass isn't a good plan

For a long time it was believed that you simply “grow out” of this pain. That turned out not to be true. In people followed 5 to 8 years after diagnosis, 57% reported an unfavourable recovery, and a worse outcome was more common in those whose pain had lasted more than a year before they sought help. In adolescents, up to 65% still have pain after two years, and up to 40% after five.

When researchers compared all treatments, every one of them (education, exercise, insoles, taping or mobilisation) was better than waiting at three months. That is why they recommend avoiding a wait-and-see approach.

Exercise is the foundation, but it has to be dosed wisely

On one thing everyone agrees: exercise is the basis of treatment. The international expert consensus recommends exercises for the hip and knee together, combined programmes, and for some people insoles. When the knee is very irritable, you don't begin with heavy squats. Exercises start shorter, on alternate days, to mild fatigue, in positions where the knee copes better, and the load is raised gradually.

Where devices and TECAR fit in

I'll be honest here, because this is exactly where people are promised the most. Devices are not a cure that solves knee pain on its own. Tim Watson, a professor at the University of Hertfordshire and one of the best-known experts on electrophysical agents, keeps repeating rules we take seriously: choose the right modality for the right tissue, get the dose right, apply it often enough, and integrate it with what has the best evidence, which is exercise. The dose is decisive, because there are many more ways to get a dose wrong than right.

What does research say about pain at the front of the knee? A recent analysis from 2024, combining 45 trials, called some of the older guidelines into question and offered new options: neuromuscular electrical stimulation (NMES) and radiofrequency diathermy, the group TECAR belongs to, when added to exercise, gave an additional short-term reduction in pain compared with exercise alone. Still, the result should not be read as a promise, but as a basis for careful use.

TECAR deserves a word of its own. A 2020 review of 13 papers on capacitive and resistive electric transfer (mostly spine pain and knee osteoarthritis) rated it a promising therapy for pain, but only two of those trials had a low risk of bias. In other words, there are reasons to use it, and no reason to present it as a miracle.

What an assessment looks like

It begins with a conversation: what brings the pain on (stairs, squats, sitting, running), what eases it, what you do for a living and what you have already tried. Then we examine the knee, hip and foot, assess strength and perform movements that reproduce the pain, such as a squat, a step-down and a single-leg squat. That rules out other causes and shows where the knee is most sensitive.

At the end you get a clear answer and a plan. It usually consists of exercise dosed to how irritable the knee is, an explanation of what is going on and, when appropriate, devices (TECAR, electrical stimulation, analgesic currents) and manual therapy, as part of a programme.

Also, old injuries, scars and sometimes even internal-medicine problems can point to problems with how fascia works normally, which you can read about in the previous article.

What you can do right away

• Don't stop everything you enjoy. Cut back on what irritates most, such as downhill walking, deep squats and sitting without moving, then return to it gradually.
• When you sit for long, stand up and straighten the knee.
• Notice whether the pain changes when you change your shoes or the surface.
• Noise without pain is not a reason to worry.

When not to wait and see a doctor right away

See a doctor if you notice any of the following:

• the knee swells suddenly after an injury or fall;
• the knee locks or feels like it gives way;
• you can't put weight on the leg;
• the knee is red and warm, with a fever;
• the pain is severe at night or at rest;
• you notice a deformity after a blow.

In those cases a medical examination comes before any therapy.