MyChart
Will running ruin your knees? It’s one of the most-Googled questions in the sport, and the short answer is no—but the full answer is more useful. Here’s a breakdown of what actually happens to your knees when you run and how to keep them healthy for the long haul.
“The biggest misconception is that running causes knee osteoarthritis and is bad for the joints. The opposite is actually true; there is a higher risk of developing knee osteoarthritis in sedentary individuals than those who run recreationally. In elite ultramarathon runners, there is a higher risk of developing knee osteoarthritis, but for the rest of us, running is joint protective. Most people can keep running for decades—it just takes training smart along the way.”
Thomas Mullin, MD, CAQSM
Welia Health Sports Medicine Physician
How does running impact the knees?
With each stride, your knee absorbs a wave of force—cartilage, muscles and tendons all working together to distribute that load. In a healthy, well-conditioned knee, running doesn’t grind the joint down the way most people assume. Problems tend to surface when training intensity increases faster than the body can adapt.
What’s the one mistake runners make that hurts their knees?
Doing too much, too soon. What may be surprising is that cardiovascular fitness improves faster than your tendons, ligaments and cartilage can adapt to added stress—so you might feel ready for three more miles or a hilly new route well before your knees actually are. That mismatch is the single biggest driver of knee pain in runners. Be aware of your knee’s response when switching to trail running, kick-starting training for a race or jumping back into a routine after time off.
Does running ruin your knees and cause arthritis?
Quite the opposite, according to the research. One widely cited study found recreational runners had lower rates of hip and knee osteoarthritis (3.5%) than both competitive runners (13.3%) and people who didn’t run at all (10.2%). Running at a recreational pace appears to strengthen the muscles that support the knee rather than wear down the joint. Things like previous injury, joint alignment and family history usually play a bigger role than mileage.
What is runner’s knee?
Runner’s knee—medically called patellofemoral pain syndrome—causes pain around or behind the kneecap. It typically happens when the kneecap doesn’t track smoothly in its groove. Often, this results from weak hip and thigh muscles, tightness in surrounding tissues or a sudden jump in training. It’s uncomfortable, but it’s also one of the most treatable running injuries.
Try any of these 10 Exercises to Treat and Prevent Runner’s Knee.
How can I tell the difference between soreness and an injury?
Timing is often the best clue. Soreness typically shows up a day or two after a hard effort—a dull, generalized ache that improves with rest and light movement. Injury pain tends to show up during the run itself, and it doesn’t fade once you’re warmed up.
A few signs that point toward injury rather than soreness:
- Pain that’s sharp or focused on one specific spot, rather than dull and spread out
- Swelling, numbness or tingling
- Pain that doesn’t ease up after a few days of rest, or gets worse instead of better
- Pain that wakes you up at night or lingers even when you’re not running
- Any change in your gait, or a sense that the knee is unstable or giving way
When any of these show up, it’s time to get it looked at rather than push through.
How can I keep my knees, joints and muscles healthy?
A few consistent habits go a long way toward keeping your knees in the game.
- Wear supportive shoes suited to your foot and running style, and replace them regularly..
- Increase mileage gradually—many runners use the “10% rule” (no more than a 10% weekly increase) as a rough guideline, though even sports medicine researchers debate whether that exact number holds up. The safer takeaway—increase slowly and pay attention to how your body responds.
- Build strength in your hips, quads and glutes, not just your legs from the knee down.
- Stretch and work on mobility, especially through the hips and calves.
- Mix in cross-training and rest days so the same joints aren’t absorbing every workout.
What are the best ways to prevent knee pain?
Prevention isn’t always glamorous, but it works: warm up, don’t rush, and listen when your body’s talking.
- Warm up before you run instead of starting at full pace.
- Avoid sudden jumps in distance, speed or hills.
- Listen to your body and adjust rather than pushing through discomfort.
- Keep up with strength training—even a couple of short sessions a week helps.
What should I do if my knees start hurting?
First, back off your mileage, ice the area and give it a few days. If the pain persists, gets worse or comes with swelling, instability or a limp, it’s time to have it evaluated rather than run through it. Catching it early usually means a faster, simpler recovery. Our Sports Medicine and Rehabilitation teams are here to help.
Training for a race next month?
If you’re setting your sights on the Mora Half Marathon & 5K on August 15, these same principles apply: build mileage gradually, don’t skip strength work and listen to your knees along the way. Whatever race goal you have, a smart training plan is the best injury prevention there is.
Dealing with knee pain or just want a training plan that keeps you running injury-free? Welia Health’s Sports Medicine and Rehabilitation teams can help—call us at 320.225.3356.
