3 Running Form Mistakes That Cause Knee Pain (And How to Fix Them)

Knee pain is one of the most common complaints I hear from runners — and one of the most misunderstood. Most people assume the problem is in their knee. But after years of working with runners as a physical therapist, I can tell you: the knee is usually where the pain is, not where the problem is.

In the vast majority of cases, runner's knee pain is a biomechanical issue — a pattern in how your body moves that places excessive stress on the joint. The good news is that movement patterns can be corrected. Here are the three most common form mistakes I see, and what to do about each one.

Mistake 1 — Overstriding (Heel Striking Far in Front of Your Body)

When your foot lands significantly in front of your center of mass, it acts like a brake with every step. This braking force travels up the kinetic chain and lands directly on your knee.

The fix: Work on increasing your step rate (cadence) by about 5–10% without increasing your speed. More steps per minute = shorter stride = foot landing closer under your hips. Even a small cadence increase dramatically reduces impact force at the knee.

Mistake 2 — Knee Valgus (Knee Caving Inward)

If your knee drops toward the midline when your foot strikes the ground, your IT band, patella, and medial structures are all taking uneven stress. This pattern is almost always driven by weakness in the hip abductors and external rotators — not a knee problem at its root.

The fix: Single-leg strength work is essential. Exercises like single-leg deadlifts, lateral band walks, clamshells, and step-downs train the hip to keep the knee tracking over the second toe. You should be able to perform these without the knee caving before increasing running mileage.

Mistake 3 — Relying on Your Quads Instead of Your Glutes

Many runners are quad-dominant, meaning their quadriceps absorb most of the landing load rather than sharing it with the hamstrings and glutes. This is taxing on the knee and leads to patellar tendon overload, runner's knee, and IT band syndrome over time.

The fix: Hip hinge and posterior chain strengthening — Romanian deadlifts, glute bridges, and hamstring curls — help retrain the pattern so your glutes take a larger share of the work on landing. Running drills like A-skips and bounding also reinforce glute activation during the stride cycle.

A Note on Mileage

Even perfect form breaks down under excessive training load. If you're ramping up mileage faster than 10% per week, your body doesn't have time to adapt — and compensatory patterns emerge. Structure your build phases carefully, and listen to early warning signs like mild aching or stiffness before they become injuries that pull you off the road.

The Bottom Line

Knee pain during running is your body flagging a problem in the system — usually at the hip, the ankle, or in how the whole chain moves together. Addressing the form mistakes above, combined with targeted strength work, is the most effective path to pain-free mileage.

If you're dealing with persistent knee pain and want a proper movement assessment, reach out at realignedbyregan.com. We work with runners remotely and can identify your specific pattern through video analysis.