If your knee has been aching on the front, around or under the kneecap, especially going downstairs, after sitting for a film, or three kilometres into a run that should feel easy, you are probably dealing with patellofemoral pain. Most people call it runner's knee.
I have rehabbed it in myself twice, in my husband Deso once, and in a long list of callanetics students and running friends. The frustrating part is not the pain itself — it is how many people do six weeks of "rest" and then jog out the door and feel it return inside a kilometre. Rest alone does not fix this. A progression does.
Here is the one I actually use.
What runner's knee actually is (in plain language)
The kneecap (patella) sits in a small groove on the front of the thigh bone (femur). When you bend and straighten your knee, the kneecap slides up and down in that groove. If it tracks even slightly off-centre, or if the joint is loaded faster than the surrounding tissues can handle, the cartilage on the back of the kneecap gets grumpy. That is the pain you feel.
Notice what I did not say. I did not say your kneecap is "out of place" or your cartilage is "worn out" or your knees are "bad." Patellofemoral pain is almost always a load problem, not a structural disaster. Your knee is doing more work than the muscles around your hip, thigh and foot are sharing with it. Change the share, change the symptoms.
The drivers I see most often:
- Weak or sleepy glutes, especially the gluteus medius (the side of your hip)
- Quadriceps that are strong but uncoordinated — the inner quad (VMO) lags behind the outer one
- A sudden jump in training volume, hill work, or downhill running
- Tight calves and stiff ankles that force the knee to absorb impact the ankle should have shared
- Worn-out shoes, or running form that loads the front of the knee instead of the hip
If you are nodding at more than one of these, you are in the right article.
The three-phase plan
Rehab works when you respect the order of operations. Phase 1 calms the joint down. Phase 2 builds the muscles that should have been doing the work. Phase 3 returns you to running without flaring everything back up.
You cannot skip phases. I have tried. It always costs you another four weeks.
Phase 1: Calm it down (roughly week 1 to 2)
Your one job in phase 1 is to reduce the irritation enough that you can train the muscles around the knee without the knee shouting back. This is not "do nothing" — that just leads to deconditioning, and then the pain comes back the moment you load again.
What to stop, temporarily:
- Running, especially downhill running
- Deep squats and lunges
- Long sets of stairs
- Anything that reproduces the pain at more than a 3 out of 10
What to keep doing:
- Walking on flat ground
- Cycling on a flat or low-resistance trainer (often surprisingly comfortable)
- Swimming or pool walking
- Upper body and core work
Exercises for this phase (daily, low load):
- Quad sets. Sit on the floor with your leg straight, a small rolled towel under your knee. Press the back of your knee gently down into the towel, tightening the front of your thigh. Hold five seconds, release. Two sets of fifteen.
- Straight leg raise. Lying on your back, bend one knee with the foot flat. Keep the other leg straight and lift it to the height of the bent knee. Lower with control. Two sets of ten each side.
- Side-lying clamshells. Lie on your side, knees bent at 45 degrees, heels stacked. Keeping your heels together, open the top knee like a clam. Slow up, slow down. Two sets of twelve each side. You should feel this in the side of the hip of the top leg, not in the lower back.
- Calf raises off a step (double leg). Stand on the edge of a step, lower the heels gently, lift back up. Two sets of fifteen.
Most people get noticeable relief in seven to ten days of consistent work at this level. If you do not — if you still have pain at rest, swelling, or the knee gives way — see someone in person. Some things masquerade as runner's knee that are not (meniscus issues, fat pad irritation, referred pain from the hip). I wrote more about a related-but-different problem here, IT Band Syndrome in Runners: Why It Keeps Coming Back.
Phase 2: Build it up (roughly week 2 to 6)
This is where the real work happens. You are calmer. Now you train the system to handle load. Three sessions a week is plenty. You do not need a gym for any of this.
The non-negotiable five:
1. Single-leg glute bridge. Lie on your back, one foot flat, the other leg extended. Push through the heel of the planted foot and lift the hips, squeezing the glute hard at the top. Lower with control. 3 sets of 10 per side. If your hamstring cramps, your glute is asleep — that is exactly why we are doing this.
2. Side-step with a resistance band. Loop a band just above your knees. Quarter-squat position, hands on hips, take ten small steps to the right, then ten back to the left. The leading knee should not cave inward. 3 rounds. Your gluteus medius will burn. Good.
3. Step-ups (controlled). A step or low box, knee-height or lower. Step up slowly — push through the whole foot, not just the toes — stand tall, and step down even more slowly (3 seconds down). The slow lowering is the part that fixes runner's knee, because most patellofemoral pain happens on impact and descent. 3 sets of 8 per leg. If the front of your knee complains, lower the step.
4. Spanish squat (or a wall sit with a band). Loop a sturdy band around a pole at knee height and around the back of your knees. Step back so the band is taut, sit your hips back, lower into a squat keeping the shins relatively vertical. Hold 30 to 45 seconds, 3 rounds. No band? Wall sit with feet a little further out than usual, knees over heels not over toes. This one is brilliant for the quads without hammering the kneecap.
5. Single-leg calf raise. Stand on one leg on a step. Raise and lower slowly. 3 sets of 12 per side. The calf shares load with the knee; a strong calf is a quiet knee.
Mobility to pair with this:
- Standing calf stretch against a wall, 2 minutes per side daily
- Couch stretch (kneeling lunge with back foot up on a sofa) for hip flexors, 90 seconds per side
- Foam roll the outer thigh and glute, gently, two to three times a week
Two things I want to flag. First, do not chase the burn into the front of your knee. If a particular exercise causes pain above 3 out of 10 during, or that lingers more than 24 hours after, modify it (smaller range, less load) or skip it for now. Second, do not add running back yet, even if you feel great. I know. I have been the runner who felt great in week three and was back in pain by week four. Phase 2 is when the muscles are getting stronger; the tendons and joint surfaces are still catching up.
Phase 3: Return to running (roughly week 6 onward)
You graduate to phase 3 when you can do all five of the phase 2 exercises with good form, both sides feel roughly equal, and the knee is quiet during normal life — stairs, squatting to pick something up, sitting for an hour.
This is a return-to-run progression, not a return-to-training-plan. The first run is humbling. Make peace with that.
Week 1: Walk 4 minutes, jog 1 minute. Repeat 5 times. Three sessions, on flat ground, alternate days.
Week 2: Walk 3 min, jog 2 min, ×5. Three sessions.
Week 3: Walk 2 min, jog 3 min, ×5. Three sessions.
Week 4: Walk 1 min, jog 4 min, ×5. Three sessions.
Week 5: Continuous easy 20 to 25 minutes. Two sessions, plus one walk-jog.
Week 6: Continuous easy 30 minutes. Add gentle rolling terrain.
Rules during return-to-run:
- Effort is conversational, no exceptions. If you cannot speak in full sentences, slow down.
- No downhill running yet. Flat or slight uphill only until week five.
- Keep doing your phase 2 exercises three times a week. This is the part everyone drops. Do not drop it.
- If a session leaves pain above 3/10 that lasts more than a few hours, drop back one week of the progression.
Hills and speed work come back after week six, one at a time, never in the same week as a step up in mileage.
When a knee brace actually helps (and when it lies to you)
I get asked about braces constantly, by runners and by callanetics students. The honest answer has two parts.
Where a compression sleeve genuinely helps:
- During the return-to-run phase, as a proprioceptive cue. It reminds your brain the knee is there, and many people land more softly with one on.
- On race day, when you are about to ask more of the joint than you have in training.
- For people coming back from a specific event (a fall, a tweak) who want a bit of stability while they rebuild.
For lighter compression and warmth — what I personally reach for during the rebuild phase and on most training runs — a sleeve like the HYKLE Octo Knee Brace does the job. It is supportive without being stiff, you can run in it for hours, and the compression helps with swelling on the days the knee feels puffy. For something with a bit more structure when you need real stabilization (think: long downhill on race day, or coming back from a more significant injury).
Where a brace becomes a problem:
When you wear it instead of doing the work. A brace can mask pain enough that you keep running, keep loading, and never address why the knee hurt in the first place. Six weeks later, the underlying issue is worse and your training week is built around a piece of fabric.
A brace is a bridge during rehab and a tool on hard days. It is not the rehab.
A short note from my own training
Two years ago, in the middle of training for a 60 km mountain race, I started getting that familiar dull ache under my right kneecap on long descents. I had increased downhill volume too fast — classic mistake, and I knew better. I gave myself ten days of phase 1, four weeks of phase 2 (the band side-steps were absolutely brutal in week one — clear signal of which glute had checked out), and four weeks of return-to-run. I raced. I finished. No knee pain.
The reason I tell this is not that my plan worked — of course I am going to say my plan worked. It is that even as a physiotherapist who knows exactly what to do, I needed the full ten weeks. There is no fast version. Anyone selling you one is selling you a relapse.
Quick FAQ
Can I do this without a gym? Yes. Everything in phase 2 needs a resistance band, a step, and a wall. That is it.
How do I know if it is really runner's knee and not something else? Patellofemoral pain is felt around or under the kneecap, worse with stairs (especially down), squatting, and sitting with the knee bent for long periods. If your pain is sharp, on the side or back of the knee, or if your knee swells visibly, locks, or gives way — get it looked at in person.
Can I cycle while I rehab? Yes, usually. Lower the saddle a little so your knee is not bending past 90 degrees, keep the resistance light, and stop if it provokes pain.
Do I need to ice it? A cold pack for 10 minutes after a session can feel good and is harmless. It is not magic. The progression is the magic.
What if I am also getting hip pain or back pain? Common, because the same weak glutes drive all three. The phase 2 exercises help all of them. If the lower back pain is the dominant problem, this one is closer to your situation: 5 Knee-Strengthening Exercises I Give Every Runner with Cranky Knees.
The thing I want you to take away
Runner's knee is not a sentence. It is a signal that the load on the front of your knee has outgrown the strength of everything supporting it. Calm it down, build it up properly, return to running with patience, and the knee almost always becomes a non-issue.
If you skip the build phase because your knee feels better and head straight back out the door, you will be back in a brace and a forum thread inside a month. Do the work in the order it is meant to be done. Your future kilometres will thank you.