For decades, runners have heard the same warning:
“Running ruins your knees.”
I’ll admit, years ago, I believed it too. The logic seemed sound: all that pounding must wear the joints down, right?
Turns out, the science says the exact opposite.
According to new research published in The American Journal of Sports Medicine, running doesn’t destroy your knees—it helps protect them.
Do Runners Really Get More Arthritis? The Science Says No
A 2023 systematic review led by Dhillon and colleagues analyzed data from over 14,000 people—7,194 runners and 6,947 non-runners—to see if running actually increases the risk of knee osteoarthritis (OA).
Here’s what they found:
- Runners had a lower prevalence of knee pain and arthritis than non-runners.
- Cartilage health and joint space were the same or better in runners.
- Even when bone spurs were detected, they didn’t translate to pain or disability.
In short, runners’ knees looked and felt healthier than those who didn’t run.
Why Running Protects Your Knees
So how can something that clearly loads your knees actually protect them?
The answer: adaptation.
When you run consistently and intelligently, your body doesn’t break down—it adapts. Here’s how:
- Cartilage strengthens with repeated, moderate stress.
- Joint fluid circulation improves, delivering more oxygen and nutrients.
- Muscles and tendons support your knees better, reducing load on ligaments.
- Inflammation decreases and weight stays in check, both critical for joint longevity.
Your knees don’t hate running. They hate inconsistency. Movement is what keeps them alive and healthy.
So If Running Isn’t the Problem… Why Do Your Knees Hurt?
Great question.
If you’re dealing with knee pain while running, odds are the issue isn’t arthritis—it’s one (or several) of these eight factors:
- Training Volume: Spiking mileage too fast.
- Body Mass: Extra load = more joint stress.
- Recovery: Ignoring rest days or skipping sleep.
- Nutrition: Under-fueling slows tissue repair.
- Strength Training: Weak hips and quads destabilize the knees.
- Running Form: Poor mechanics multiply joint strain.
- Frequency: Back-to-back hard days leave no time for adaptation.
- Overtraining: More isn’t always better—it’s about balance.
At Next Level Physio, we see this every day. Runners who train smart, lift consistently, and recover well don’t just stay pain-free—they perform better year after year.
Move Smart. Run for Life.
Running doesn’t ruin your knees. Not moving enough does.
When paired with strength, recovery, and smart progression, running actually makes your knees stronger.
So the next time someone tells you that running causes arthritis, tell them this:
Science says you’re protecting your joints, not destroying them.
Ready to Run Smarter and Stay Pain-Free?
If your knees have been keeping you from hitting the pavement, it’s time for a smarter plan.
Our team of running specialists and sports physical therapists in Montclair, NJ, Woodcliff Lake, NJ, Raleigh, and Cary, NC help athletes uncover the real reason behind their pain and build a system for performance that lasts.
Schedule your Runner’s Performance Assessment today and learn how to keep running for life—with confidence, strength, and zero fear of knee pain.
References: Dhillon, J., Kraeutler, M. J., Belk, J. W., Scillia, A. J., McCarty, E. C., Ansah-Twum, J. K., & McCulloch, P. C. (2023). Effects of Running on the Development of Knee Osteoarthritis: An Updated Systematic Review at Short-Term Follow-up. The American Journal of Sports Medicine, 51(9), 2468–2478. https://pubmed.ncbi.nlm.nih.gov/36875337/ PubMed+2journals.sagepub.com+2