Runner’s knee usually shows up the same way. A few kilometres into your run, a dull ache settles around the front of your knee. It eases when you stop — so you tell yourself it’s nothing. Then it’s back the next time you lace up.

If that sounds familiar, you’re in the right place. It’s one of the most common problems I see in runners.

As a physiotherapist, I work with runners every week. And I can tell you that runner’s knee is rarely only about the knee itself.

The fixes most runners try first are usually the ones that let them down. This article is about the few principles that actually matter — why it happens, and what helps it settle.

What Runners Usually Mean by “Runner’s Knee”

Runner’s knee is an everyday term for pain around the front of the knee, or behind the kneecap. Clinically, it’s usually called patellofemoral pain — pain from where the kneecap meets the thigh bone. Not every sore knee is the same thing, though. You can read more about the clinical side on our patellofemoral pain syndrome page.

Most runners describe it in fairly recognisable ways. The pain sits around or under the kneecap, not in one sharp spot. It tends to grumble rather than stab.

A few patterns come up again and again:

It often hurts more going down stairs than up.
It aches after long spells of sitting — a long drive, a day at a desk, a flight. Some people call it “moviegoer’s knee.”
It builds the further into a run you get, then settles once you stop.

If that picture fits, runner’s knee may be part of the picture — but the label matters less than the reason it turns up. And that starts with one simple idea.

Start With One Idea: Load vs Capacity

This is the idea I come back to most with the runners I see. Many running niggles, runner’s knee included, come down to a mismatch between two things:

Load — how much you’re asking your body to do.
Capacity — how much it can comfortably handle right now.

Think of capacity as a bucket. Every run, hill and speed session pours water in. While the bucket is big enough, you’re fine. Pain shows up when the water comes in faster than the bucket can hold — when load outruns capacity.

Here’s how that looks in practice. A runner comes to me a few weeks after entering a race. They’ve jumped their weekly distance, added a hill session, and switched to faster shoes — all in the same fortnight.

None of that is reckless on its own. But stacked together, the load shot past what the knee had built up to handle. So the kneecap started to complain.

The knee wasn’t the problem. The rate of change was.

That reframes everything. Your knee isn’t broken. It’s simply overloaded for what it can tolerate today.

So you have two real levers: bring the load down, or build the capacity up. Hold onto that — it runs through everything below.

It’s Often Not Just the Knee

Here’s a part that surprises a lot of runners. The spot that hurts and the thing causing it aren’t always in the same place.

The kneecap sits in the middle of a long chain. Hips and glutes above. Calves, ankles and feet below.

When one link in that chain isn’t pulling its weight, the knee tends to absorb the difference. Reduced hip control, in particular, can allow the knee to drift inwards with each stride — which may increase stress around the kneecap.

That’s why treating only the knee usually disappoints. It’s also why rubbing, taping or icing the sore spot rarely settles runner’s knee for good. You’re working on the symptom, while the real driver sits somewhere else.

It also points to what does work: building capacity across the whole chain, not just at the knee.

The Fixes Runners Reach for First (and Why They Don’t Last)

When runner’s knee flares, most runners try the same handful of things. In practice, nearly everyone who comes to see me has already tried a few:

Rest. The pain settles, so you head out again — and it comes straight back. Nothing about your capacity changed.
Stretching and foam rolling. They can feel great and ease tension. But they don’t help the knee tolerate more load.
New shoes or orthotics. Sometimes worth exploring. Still, shoe inserts tend to give only short-term help, and a new pair rarely fixes a load problem.¹
Tape, straps and sleeves. These can take the edge off a run, but they don’t build the capacity your knee needs.
Ice and anti-inflammatories. Useful for short-term comfort. They manage the symptom while the cause sits untouched.

Notice the pattern. Every one of these is a comfort tool, not a capacity builder.

The honest truth is that most runners struggle to deal with runner’s knee on their own. Not because they aren’t trying — but because they’re reaching for comfort when the real problem is capacity. That’s why the relief never sticks.

The Principles That Actually Matter

So if the quick fixes don’t last, what does? With runner’s knee, it comes down to a few principles. They’re the same ones I work through with almost every runner I treat.

Manage the Load Before You Blame the Knee

The most common trigger for runner’s knee is doing too much, too soon. A jump in distance. A block of hills. A new speed session. Or simply more running than your body has caught up with.

In my experience, this is behind the large majority of cases I see.

A large 2025 study of more than 5,000 runners backs this up. Injury risk climbed when runners pushed a single run beyond their recent longest-run benchmark.² And when researchers compared treatments for this kind of knee pain, teaching runners to manage their load worked about as well as adding exercises or changing their form — a sign of how central load is.³

The starting point is rarely complicated:

Build up gradually, not in big leaps.
Space your hard sessions out.
Slip in the occasional easier week.

A simple gauge I give runners: a niggle that’s gone by the next morning is usually fine to work with. One that’s still there, or worse, the day after means you’ve pushed past your current capacity.

You Can’t Rest Your Way to a Stronger Knee

Rest lowers your load, so the pain quietens down. But rest alone doesn’t raise your capacity. It doesn’t make the bucket bigger.

That’s what strength work does.

This is the one I find hardest to convince runners of. Resting feels productive — but it doesn’t build anything.

A large review of injury-prevention research found that strength training roughly halved the rate of overuse injuries.⁴ And for this kind of knee pain, expert guidelines point to exercise — especially hip and thigh strengthening — as the most reliable approach.¹ The calves matter too. They absorb a surprising share of the load on every stride.

Recovery Is Where Adaptation Happens

Many runners get this backwards. You don’t get more resilient during a run. You adapt in the hours and days between runs, as your body repairs and rebuilds a little stronger.

In my experience, this is the principle runners overlook most. Poor sleep and poor recovery are consistently linked with worse performance, slower adaptation and higher injury risk in athletes.⁵

And it isn’t only sleep. Busy, high-stress weeks, rushed meals and broken routines all eat into recovery. A desk-bound week on bad sleep leaves far less in the tank than most people assume.

Skimp on recovery and your capacity stays stuck low — no matter how hard you train.

Consistency Beats Heroics

Capacity is built slowly. It comes from repeated, manageable stress over weeks and months.

The runner who does steady, sensible work almost always ends up more durable than the one who swings between heroic weekends and forced layoffs.

It’s nearly always the consistent runners who I stop seeing in clinic. Boring consistency quietly builds a knee that holds up.

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Why Runner’s Knee Keeps Coming Back

If runner’s knee has visited you more than once, here’s the usual reason. The flare settles. Then you go back to the exact same running — same weekly structure, same jumps in load, same missing strength and recovery.

I see this pattern again and again. The symptom calmed down, but nothing underneath it changed.

That’s the principle most runners skip. Settling a flare and building a knee that won’t flare again are two different jobs.

The second only happens when load, strength and recovery are managed deliberately — and progressed in a way that fits you. Your history. Your goals. Your week. Not left to chance.

Can You Keep Running With Runner’s Knee?

This is the first question nearly every runner asks me. The answer is usually yes — with a caveat.

The goal usually isn’t complete rest forever. It’s to adjust your load so symptoms stay manageable while you rebuild capacity underneath. Often that means dialling back distance or pace for a while, swapping a session or two, or using run-walk intervals — rather than stopping cold.

Worried that running is quietly wearing your knees out? There’s some reassurance here. A large review found that recreational runners actually have lower rates of knee and hip arthritis than people who don’t run.⁶

That said, it isn’t a blanket green light. Some knees do need a proper break and a closer look.

Your Next Step Principles are useful, but they only work once they’re built into a structured plan — progressed in the right order, with clear steps to follow. That’s exactly what The Smart Runner’s System is designed to do. Explore The Smart Runner’s System →

How Long Does Runner’s Knee Take to Settle?

This is the other question I’m always asked. I’ll be honest: usually longer than runners want to hear, but not as long as they fear.

Capacity is a slow build. Tissues adapt over weeks, not days. So the sharpest pain often eases fairly quickly once the load is sorted — but genuinely rebuilding what the knee can tolerate takes longer. The structured programmes studied in runners with this kind of pain typically run over a couple of months.³

The runners who recover fastest aren’t the ones who do the most. They’re the ones who stay patient and consistent — and who resist the urge to test the knee with a big run the moment it feels better.

That “it feels fine, let me push” moment is exactly where a lot of flares quietly restart.

When to Get It Checked

Most of the runner’s knee I see settles with sensible load management and strength work. But some signs are worth taking seriously.

Get it properly assessed, rather than pushing through, if your pain is:

sharp, getting worse, or comes with swelling
linked to the knee giving way, locking, or catching
the result of a specific injury or fall
stopping you from running normally

A quick check can rule out anything that needs more attention — and get you a plan that fits.

Key Takeaways

Runner’s knee is usually a load problem, not just a knee problem. Pain shows up when demand outruns what your knee can handle.
The contributing factors often sit up or down the chain — hips, calves, feet — not only at the kneecap.
The usual fixes buy comfort, not capacity, which is why relief fades.
What moves the needle: manage your load, build strength, respect recovery, stay consistent.
Rebuilding capacity takes weeks to months. Patience beats heroics.
It comes back when you return to the same training that caused it.
You can usually keep running with sensible adjustments — but get sharp, swelling, locking or giving-way pain checked.

This article is general information, not medical advice. If you’re worried about your knee, or it isn’t settling, get it assessed by a healthcare professional. You’re welcome to contact the practice at info@ddcphysiotherapy.co.za.

Daniel da Cruz is a physiotherapist in Sandton who regularly treats runner’s knee, patellofemoral pain, and overuse running injuries in clinical practice. He uses evidence-based rehabilitation, progressive strength training, and movement retraining to help his patients recover and return to the activities they love.

References

Collins, N. J., Barton, C. J., van Middelkoop, M., Callaghan, M. J., Rathleff, M. S., Vicenzino, B. T., Davis, I. S., Powers, C. M., Macri, E. M., Hart, H. F., de Oliveira Silva, D., & Crossley, K. M. (2018). 2018 consensus statement on exercise therapy and physical interventions (orthoses, taping and manual therapy) to treat patellofemoral pain: Recommendations from the 5th International Patellofemoral Pain Research Retreat, Gold Coast, Australia, 2017. British Journal of Sports Medicine, 52(18), 1170–1178. https://doi.org/10.1136/bjsports-2018-099397
Frandsen, J. S. B., Hulme, A., Parner, E. T., Møller, M., Lindman, I., Abrahamson, J., Simonsen, N. S., Jacobsen, J. S., Ramskov, D., Skejø, S., Malisoux, L., Bertelsen, M. L., & Nielsen, R. Ø. (2025). How much running is too much? Identifying high-risk running sessions in a 5200-person cohort study. British Journal of Sports Medicine, 59(17), 1203–1210. https://doi.org/10.1136/bjsports-2024-109380
Esculier, J.-F., Bouyer, L. J., Dubois, B., Fremont, P., Moore, L., McFadyen, B., & Roy, J.-S. (2018). Is combining gait retraining or an exercise programme with education better than education alone in treating runners with patellofemoral pain? A randomised clinical trial. British Journal of Sports Medicine, 52(10), 659–666. https://doi.org/10.1136/bjsports-2016-096988
Lauersen, J. B., Bertelsen, D. M., & Andersen, L. B. (2014). The effectiveness of exercise interventions to prevent sports injuries: A systematic review and meta-analysis of randomised controlled trials. British Journal of Sports Medicine, 48(11), 871–877. https://doi.org/10.1136/bjsports-2013-092538
Charest, J., & Grandner, M. A. (2020). Sleep and athletic performance: Impacts on physical performance, mental performance, injury risk and recovery, and mental health. Sleep Medicine Clinics, 15(1), 41–57. https://doi.org/10.1016/j.jsmc.2019.11.005
Alentorn-Geli, E., Samuelsson, K., Musahl, V., Green, C. L., Bhandari, M., & Karlsson, J. (2017). The Association of Recreational and Competitive Running With Hip and Knee Osteoarthritis: A Systematic Review and Meta-analysis. The Journal of orthopaedic and sports physical therapy, 47(6), 373–390. https://doi.org/10.2519/jospt.2017.7137

Runner’s Knee: Why It Happens and the Principles That Help It Settle

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