Glenn Wellmann DPT

If the front of your knee aches when you run downhill, when you stand up after a long meeting, or when you take stairs two at a time, you are most likely dealing with patellofemoral pain. It is the most common running knee complaint I see, and it responds well to a plan.

Runners describe it consistently: a dull ache “under” or “around” the kneecap rather than one sharp point, fine for the first mile then creeping in, worse on descents than climbs, and achy after sitting with the knee bent. Some people also notice grinding with squats, which sounds alarming but usually means nothing on its own (more on that in my post on joint noises). This is a load problem at the joint between your kneecap and thigh bone, not a sign that something is torn.

Why it shows up in runners

Every step compresses your kneecap into the groove at the end of your femur, at roughly four times body weight, and at 160 steps per minute that is about 19,200 body weights of loading per hour of running (Esculier et al., Journal of Athletic Training, 2020). The tissue is not fragile. It just has a ceiling. Four things push you over it:

• A training load spike. A jump in weekly mileage, a new speed block, or a sudden move to hill repeats. The classic story is “nothing hurt until I added a day.”
• Quad and hip weakness. Weak muscles do not absorb load, so more of it lands on the joint. This is the variable you control most.
• Cadence and stride. A long, overstriding step lands with the knee out in front of you and raises force per step. In 30 recreational runners, running at 110 percent of preferred step rate cut peak patellofemoral force about 14 percent, while 90 percent of preferred raised it about 15 percent (Lenhart et al., Medicine and Science in Sports and Exercise, 2014).
• Downhill running. When researchers modeled load across speeds, gradients and cadences in 19 runners, uphill running raised tibia and Achilles load but lowered kneecap load, downhill did the reverse, and higher cadence reduced estimated damage at every site (Van Hooren et al., Scandinavian Journal of Medicine and Science in Sports, 2024).

What the evidence actually says

Exercise is the treatment of choice. The 2018 international consensus statement from the 5th Patellofemoral Pain Research Retreat, built from 41 experts reviewing 655 papers, recommends exercise therapy to reduce pain short, medium and long term, and recommends combining hip focused and knee focused exercise over knee exercise alone (Collins et al., British Journal of Sports Medicine, 2018).

Hip work and quad work perform about the same, so pick what you will do. A 200 person randomized equivalence trial ran both at home, 3 times a week for 12 weeks, 3 sets of 8 to 12 reps. Anterior Knee Pain Scale scores improved 7.6 points with quads and 7.0 with hips, a difference of 0.6 points (95 percent CI negative 2.0 to 3.2), and strength rose 10 to 11 percent in both. The authors’ own caveat: neither average cleared the 8 to 10 point threshold usually called meaningful (Hansen et al., British Journal of Sports Medicine, 2023).

How you manage your running matters as much as the exercises. In 69 runners with this diagnosis, all three groups got education on symptoms and training modification, and adding exercise or gait retraining gave no significant extra benefit over education alone at 4, 8 or 20 weeks (Esculier et al., British Journal of Sports Medicine, 2018). Do not skip strengthening. Do stop treating your training plan as a side note.

A six week starting plan

Work in a range you can tolerate: up to about 3 out of 10 during a session, back to your baseline within 24 hours. If the next morning is worse, repeat the previous week instead of progressing.

1. Spanish squat or wall sit hold, knees near 60 degrees: 5 holds of 30 to 45 seconds, daily. Isometrics are usually the most comfortable entry point.
2. Leg press or shallow double leg squat: 3 sets of 10, 3 days a week, only to a depth that stays quiet.
3. Side lying hip abduction: 3 sets of 12 each side, 3 days a week. Cue: stack your hips, heel slightly behind the body, no rolling backward.
4. Standing calf raise: 3 sets of 15, 3 days a week. Your calf absorbs load your knee otherwise takes.

To reach week 3: all sets at 3 out of 10 or less with no next day flare for a full week.

1. Split squat: 3 sets of 8 each leg, 3 days a week, adding weight before depth. Cue: front shin near vertical, hips level, knee not collapsing inward.
2. Step down from a 4 to 6 inch step: 3 sets of 8 each leg, 3 days a week, with a controlled 3 second lower.
3. Single leg bridge: 3 sets of 10 each side, 3 days a week.
4. Side plank with hip abduction: 3 sets of 8 each side, 2 to 3 days a week.
5. Keep the isometric holds as a warm up on run days.

To reach week 5: 8 clean step downs per leg with level hips and no pain spike, plus split squats carrying added load.

1. Heavier split squat or leg press: 4 sets of 6 to 8, 2 to 3 days a week, at about an 8 out of 10 effort.
2. Single leg calf raise: 3 sets of 12 each side, 3 days a week.
3. Low level hops: 3 sets of 20 seconds of pogo hops in place, 2 days a week, progressing to single leg only once double leg work is symptom free.
4. Deceleration work: controlled step down to a soft landing, 3 sets of 6 each leg, 2 days a week.

How to change your running while you do this

• Reduce volume temporarily, do not stop. Cut mileage enough that running stays at 2 out of 10 or less and leaves you no sorer the next day, often 30 to 50 percent to start. Shorter and more frequent beats long.
• Nudge cadence up 5 to 10 percent. If your comfortable cadence is 164, aim for 172 to 180 in a few minute blocks using a metronome or watch alert.
• Avoid steep downhills for three to four weeks. Flat routes or a treadmill at 1 percent are friendlier to the kneecap.
• Form cues: quicker and quieter steps, foot landing closer to under your hips, tall torso, and no deliberate change to your foot strike.
• Rebuild about 10 percent per week once running is pain free, adding distance or intensity in a given week, not both.

How to know it is working

Progress here is rarely a straight line, so track something objective. Every two weeks check three things: pain free minutes of running, controlled step downs on the painful leg, and whether stairs and long sitting still bother you. Two of three improving means the plan is working. Nothing moving after six honest weeks means the plan needs changing, not more of the same.

Red flags: when to get it looked at in person

• The knee gave way, locked, or will not fully straighten
• Rapid swelling, especially within hours of an injury
• A specific trauma: a fall, a twist, or a direct blow to the kneecap
• Warmth, redness, or fever with the knee pain
• Night pain that wakes you, or pain escalating despite reduced load
• Numbness, tingling, or weakness spreading down the leg
• No change after six to eight weeks of consistent, sensible loading

Where to go from here

Most runners can start this on their own and many get better with it. If you have already tried strengthening and nothing moved, or you want the plan matched to your race calendar instead of a template, that is what a comprehensive evaluation is for: a full hour, one on one, and a plan you walk out holding. If you would rather have the programming written and progressed for you, my home exercise program service does that.

References

• Collins NJ, Barton CJ, van Middelkoop M, et al. 2018 Consensus statement on exercise therapy and physical interventions to treat patellofemoral pain. British Journal of Sports Medicine. 2018;52(18):1170. https://bjsm.bmj.com/content/52/18/1170
• Hansen R, Brushoj C, Rathleff MS, et al. Quadriceps or hip exercises for patellofemoral pain? A randomised controlled equivalence trial. British Journal of Sports Medicine. 2023;57(20):1287. https://bjsm.bmj.com/content/57/20/1287
• Esculier JF, Bouyer LJ, Dubois B, et al. Is combining gait retraining or an exercise programme with education better than education alone in treating runners with patellofemoral pain? British Journal of Sports Medicine. 2018;52(10):659. https://bjsm.bmj.com/content/52/10/659
• Lenhart RL, Thelen DG, Wille CM, et al. Increasing running step rate reduces patellofemoral joint forces. Medicine and Science in Sports and Exercise. 2014;46(3):557. doi:10.1249/MSS.0b013e3182a78c3a. https://pmc.ncbi.nlm.nih.gov/articles/PMC3925193/
• Van Hooren B, van Rengs L, Meijer K. Per-step and cumulative load at three common running injury locations. Scandinavian Journal of Medicine and Science in Sports. 2024;34(2):e14570. doi:10.1111/sms.14570. https://pubmed.ncbi.nlm.nih.gov/38389144/
• Esculier JF, Maggs K, Maggs E, Dubois B. A contemporary approach to patellofemoral pain in runners. Journal of Athletic Training. 2020;55(12):1206. https://pmc.ncbi.nlm.nih.gov/articles/PMC7740062/