It didn’t announce itself. That’s the thing about runner’s knee — there’s no dramatic moment, no snap, nothing you can point at afterward and say There, that’s where it happened.
Mine started as a vague ache going down the stairs. Then it was there at the end of long runs. Then at the start of them. Then it was there when I stood up from my desk, which felt deeply unfair, because standing up from a desk is not a sport.
I lost the better part of four months to it — and, honestly, at least two of those months were spent doing the wrong things enthusiastically. So here’s the version I wish I’d read at the beginning.
Before anything else: I’m a runner who writes, not a physio or a doctor. This is my experience, not a diagnosis or a treatment plan. Knee pain has many possible causes, and they don’t all require the same treatment — so if yours is persistent, getting worse, swollen, giving way, or waking you at night, please see a physio or your doctor rather than a blog. Getting looked at early is the single cheapest thing you can do.
What “runner’s knee” actually means
It’s less a diagnosis than a nickname. Most of the time, it refers to pain around or behind the kneecap — the sort that shows up on stairs, on downhills, when you squat, and after you’ve been sitting with your knees bent for a while. Physios usually call it patellofemoral pain.
What actually causes it is still debated. The old story was “your kneecap tracks badly,” and the fix was stretching and arch support. The current thinking leans much more towards load — the knee being asked to handle more than it’s currently prepared for, whether that’s a jump in mileage, a new hill route, tired hips, or just too much too soon after a break.
That distinction mattered enormously for me, because it changed the question from “what’s wrong with my knee?” to “what am I asking my knee to do that it isn’t ready for?” One of those questions has an answer you can work on.
What didn’t work
Running through it
Three weeks of “it’ll settle once I’m warmed up”. It did settle once I was warmed up. It also got steadily worse for the other twenty-three hours of the day. I told myself I was being tough. I was slow to admit something.
Complete rest
Then I swung the other way and did absolutely nothing for two weeks. The knee felt lovely. I went for a gentle 4K, and it hurt within ten minutes — because nothing had changed except that everything around the knee had gotten weaker.
Rest takes the pain away. It doesn’t take the problem away. That was the most expensive lesson in the whole of four months.
Buying my way out of it
New shoes. A knee strap. A foam roller I used with genuine commitment. A massage gun that mostly lived in the cupboard. The strap was mildly comforting on the day. None of it addressed why my knee was unhappy, and I could have put that money towards about four physio sessions.
Stretching my quads at it
Not useless. Just not the answer. I stretched diligently for weeks, and it did roughly nothing, because tightness wasn’t the problem — capacity was.
What did work
Seeing a physio — properly
Not one session where I nodded and went home. Several, with actual homework and check-ins. She watched me run, watched me do a single-leg squat, and identified within about four minutes what I’d been failing to work out for eleven weeks: my left hip was giving up under load, and my knee was absorbing the difference.
Money well spent. If you take one thing from this article, take this one.
Strength work — the boring, unglamorous kind
Glutes, hips, quads, and calves. Three times a week, twenty minutes, in my lounge, usually while something was on TV. Nothing that looked impressive. Nothing anyone would post.
This was the actual medicine. Not because strength is magic, but because the whole problem was capacity — and capacity is built, not rested into existence. Your physio should give you a specific set for your specific knee, so I’m not going to hand you a generic list here. Do theirs, not mine.
Shortening my stride
Taking slightly quicker, smaller steps rather than reaching out in front of me. It felt ridiculous for about two weeks, then normal. It’s one of the few running-form tweaks with reasonable evidence behind it for knee pain, and it costs nothing.
Keeping the engine running
This is where indoor cycling saved my sanity. Zwift let me keep my aerobic fitness — and, more importantly, my identity as someone who trains — while my knee was rebuilding. Pain-free, low-impact, and I still got to race people on a Tuesday night.
Coming back to running with most of my fitness intact made the return about a hundred times less demoralizing. Whatever your cross-training is — bike, pool, rower — find the thing that doesn’t hurt and do that thing.
A traffic-light rule for pain
The rule my physio gave me, which took all the guesswork out of it:
- Green: Mild discomfort during, settled by the next morning → carry on.
- Amber: Noticeable pain during or still there the next day → back off, repeat the previous step.
- Red: Pain that changes how you run, or pain that’s still there 48 hours later → stop and check in with your physio.
Having a rule meant I stopped negotiating with myself mid-run. Enormously freeing.
The return-to-running ladder
Coming back was slower and less linear than I wanted, and it looked roughly like this. Each step got repeated until it was fully green before I moved up — sometimes twice, once four times.
| Step | What it looked like |
|---|---|
| 1 | Walking, pain-free, plus strength work 3× a week |
| 2 | Brisk walking on gentle hills, still pain-free |
| 3 | Walk 4 min / jog 1 min × 5, on flat ground |
| 4 | Walk 3 / jog 2 × 6 |
| 5 | Walk 2 / jog 3 × 6 |
| 6 | Continuous easy 20 min |
| 7 | Continuous easy 30 min, twice a week |
| 8 | Add a longer run back in — mileage up slowly, downhills last |
Downhills genuinely go last. They load the knee hardest, and they’re the thing most likely to undo three careful weeks in twenty careless minutes. Ask me how I know.
This ladder is what my physio built for me. Yours may look completely different, and it should — but the shape of it, small steps repeated until they’re comfortable, is the bit worth stealing.
The part I nearly ignored: fuelling
Here’s something that caught me out. When I stopped running, my instinct was to eat less, because I was “doing less”. That was completely backward.
Rebuilding tissue is work. Strength sessions three times a week are work. Your body repairs itself using the materials you give it — protein especially — and under-fuelling a body that’s trying to heal is like asking a builder to finish a wall with half the bricks.
The weeks I ate properly and consistently were the weeks the strength work actually stuck. It’s not a glamorous insight. It made a real difference.
🍽️ Eating like someone who’s rebuilding
The 30-Day Meal Plan is the TED planner for exactly this — real, everyday South African meals, sorted month by month, so that fuelling properly stops being one more decision at the end of a long day. It’s about eating well, not eating less. Instant download, yours to reuse.
What I’d do differently
- Go to the physio in week one, not week eleven. Ten weeks of guessing cost me more than the sessions ever would have.
- Never fully stop. Swap the running for something that doesn’t hurt, immediately, on day one.
- Start the strength work before something breaks. The exercises that fixed my knee are the same ones that would probably have prevented it.
- Take the niggle seriously the first time. A three-day niggle addressed is not a four-month injury.
- Write down what changed. New route, new shoes, sudden mileage jump, a busier month with worse sleep. I couldn’t remember any of it when I was finally asked.
- Stop apologizing for it. I spent an alarming amount of energy feeling guilty about being injured, which helped precisely nobody’s knee.
The bit nobody warns you about
The knee was honestly the easier half.
The harder half was watching everyone else’s runs come up in my feed. Losing the thing that regulates my mood, sorts my head out, and gives me forty minutes a day that belong to nobody else. Quietly wondering whether I’d ever get back to where I was, and whether “where I was” had actually been that good anyway.
If you’re in that bit right now, it does end. Not on a schedule you’d choose, and not in a straight line, but it ends. And the version of you that comes out the other side tends to be stronger in the hips, wiser about niggles, and a lot less inclined to add five kilometers to a long run just because the weather’s nice.
Rest made the pain go away. Strength made the problem go away. They are not the same thing.
Final thoughts
I still do the hip work. Not religiously — but three times a week, most weeks, twenty minutes, usually badly, usually while something’s on TV. It’s the least interesting thing in my training and easily the most valuable.
Runner’s knee didn’t make me a better runner. The four months of paying attention afterward did.
One more time, because it matters: this is my story, not medical advice. Knee pain has many possible causes, and a physio can tell you in one session what a blog can’t tell you in a thousand words. Please go and see one.
Dealing with a knee that won’t behave? Mail me at liz@theendurancediaries.co.za — I can’t fix it, but I can absolutely commiserate properly. 🩷
🩷The Endurance Diaries🩷
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