Knee Pain When Running: IT Band, Runner's Knee, or Patellar Tendon?
Updated: 19 hours ago
"My knee hurts when I run" can mean several different problems, and each one needs a different plan. In a study of more than 2,000 running injuries seen at a sports medicine clinic, pain around the kneecap was the most common diagnosis and IT band pain was second (Taunton et al., 2002). The good news: where it hurts, and when it hurts, narrows things down quickly.
The short version: Most running knee pain falls into a few patterns: around the kneecap, the outside of the knee, or just below the kneecap. Runner’s knee, or patellofemoral pain, is the most common of these, and combined hip and knee strengthening has the best research support. Rest can calm symptoms, but isn’t enough. For each of these patterns, the research points toward a progressive strength and load plan rather than rest alone. A one-on-one assessment tells you which pattern you have.
This guide compares the four knee problems we see most in Eugene runners. It is not a way to diagnose yourself, but it will help you understand what might be going on and when it is time to get it looked at.
Where exactly does it hurt?
Outside of the knee, often sharp, often at a predictable point in the run: points toward IT band syndrome.
Around or behind the kneecap, worse on stairs or after sitting: points toward runner's knee (patellofemoral pain).
Just below the kneecap, on the tendon: points toward patellar tendinopathy.
Along the joint line, with swelling, catching, or twisting pain: points toward a meniscus problem.
IT band syndrome: outside of the knee
IT band pain usually shows up on the outside of the knee, often at about the same point in every run. It tends to get worse running downhill and can make you stop entirely once it starts. It is common after a quick jump in mileage, a lot of downhill running, or a change in terrain.
It is the most common cause of outside knee pain in runners (van der Worp et al., 2012). The research on treatment is thinner than we would like, but across the studies that exist, hip abductor strengthening is the most consistent part of the programs that reduced pain and improved function (Sanchez-Alvarado et al., 2024). The IT band itself does not really "stretch out," which is why foam rolling alone often falls short.
Runner's knee: around or behind the kneecap
Runner's knee, or patellofemoral pain, is an ache around or behind the kneecap. Stairs, squatting, downhills, and sitting for a long time with bent knees often bring it on. It rarely comes from one bad step. More often it builds as training load outpaces what the knee is ready for (Willy et al., 2019).
An international expert consensus found the strongest support for exercise therapy, especially combining hip-focused and knee-focused strengthening (Collins et al., 2018). The same group rated taping, bracing, dry needling, and soft tissue work on their own as uncertain. They can be part of a plan, but they should not be the whole plan.
Patellar tendinopathy: just below the kneecap
This pain sits right on the tendon below the kneecap. It is common with hill repeats, speed work, and jumping. A classic pattern: stiff and sore at the start, eases once warmed up, then aches more afterward or the next morning. In a trial of 76 athletes with long-standing patellar tendon pain, a progressive tendon-loading program led to better pain and function at 24 weeks than eccentric-only exercise (Breda et al., 2021). Most participants played jumping sports rather than running, so the details of your plan should come from an assessment, but the principle holds: build load back in gradually.
Meniscus: along the joint line
Meniscus irritation usually hurts along the inside or outside joint line rather than around the kneecap. Twisting, deep squatting, and pivoting tend to aggravate it. Swelling, a catching sensation, or the knee feeling like it gets stuck are clues worth taking seriously.
What we see in Eugene runners
From Jesse Klein, DPT: A common pattern we see is doing too much, too soon, then relying on rest alone when knee pain starts. If pain keeps returning after a couple of weeks of active rest, an evaluation can help identify mobility, strength, control, or running-form factors that rest by itself will not address, and build a runner-specific return plan.
See someone promptly if
Your knee swelled up quickly after a specific twist, fall, or impact.
The knee locks, catches, or you cannot fully straighten it.
It gives way or feels unstable.
You cannot put weight on it or walk normally.
The knee is red, hot, and swollen, especially with fever. Seek urgent medical care for this one.
What a PT evaluation sorts out
A physical therapy evaluation looks at where the pain is and what provokes it, then connects it to the why: training load, strength, hip and foot control, and running mechanics. For many runners that includes watching you run, which is where a gait analysis comes in. One example of what it can surface: in a lab study of healthy runners, increasing step rate (or cadence) by 5% to 10% at the same speed reduced the load absorbed at the knee (Heiderscheit et al., 2011). That is not a cure and not right for everyone, but it is one lever worth discussing. The goal is a plan that keeps you running where it is safe to, instead of a blanket order to stop. We wrote more on that in "Stop Running" Is Not a Treatment Plan.
Next step
Book a 60-minute 1:1 PT evaluation with a Zenith DPT. No referral needed.
Still have questions and want to explore options? Book a free 15-minute discovery call with Jesse Klein, DPT and talk through options.
Once the pain settles, the strength you built is what keeps it from coming back. That is where our coached strength training picks up, with your PT down the hall.
This article is general education and not a diagnosis. If you have symptoms, get evaluated by a qualified provider.
Sources
Taunton JE, et al. A retrospective case-control analysis of 2002 running injuries. Br J Sports Med. 2002;36(2):95-101. doi:10.1136/bjsm.36.2.95
Willy RW, et al. Patellofemoral Pain: Clinical Practice Guidelines. J Orthop Sports Phys Ther. 2019;49(9):CPG1-CPG95. doi:10.2519/jospt.2019.0302
Collins NJ, et al. 2018 Consensus statement on exercise therapy and physical interventions to treat patellofemoral pain. Br J Sports Med. 2018;52(18):1170-1178. doi:10.1136/bjsports-2018-099397
van der Worp MP, et al. Iliotibial band syndrome in runners: a systematic review. Sports Med. 2012;42(11):969-992. doi:10.2165/11635400-000000000-00000
Sanchez-Alvarado A, et al. Effects of conservative treatment strategies for iliotibial band syndrome on pain and function in runners: a systematic review. Front Sports Act Living. 2024;6:1386456. doi:10.3389/fspor.2024.1386456
Heiderscheit BC, et al. Effects of step rate manipulation on joint mechanics during running. Med Sci Sports Exerc. 2011;43(2):296-302. doi:10.1249/MSS.0b013e3181ebedf4
Breda SJ, et al. Effectiveness of progressive tendon-loading exercise therapy in patients with patellar tendinopathy: a randomised clinical trial. Br J Sports Med. 2021;55(9):501-509. doi:10.1136/bjsports-2020-103403
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