Why Your Knees Hurt When You Run
Running knee pain almost always traces back to a strength or mechanics problem, not a running problem. The three most common causes: runner's knee (patellofemoral pain from weak glutes allowing the kneecap to track improperly), IT band syndrome (friction on the outside of the knee from weak hip abductors), and overpronation-related knee stress (excessive inward foot roll pulling the tibia and knee out of alignment). The solution is not to stop running forever. Reduce volume short-term, strengthen the muscles that support the knee (glutes, quads, hip abductors), correct foot mechanics with proper shoes and a structured insole, and fix overstriding by increasing cadence. Most cases resolve in 4-8 weeks.
The Three Main Causes of Running Knee Pain
Runner's knee (patellofemoral pain syndrome) causes dull, aching pain around or behind the kneecap, worsened by stairs, squatting, or sitting for long periods. It is the most common running knee injury. IT band syndrome causes sharp pain on the outside of the knee where the iliotibial band rubs against the lateral femoral condyle. Pain typically starts after a specific distance and worsens with continued running. Overpronation causes the tibia to rotate inward, pulling the knee joint out of its natural tracking groove. Over time this creates excessive wear on cartilage and ligaments. A professional Arion Running Analysis can measure your pronation pattern, ground contact asymmetry, and force distribution to determine exactly which mechanism is causing your knee pain. Pairing the analysis with a Shapes HYROX Edition insole corrects the foot mechanics that drive knee misalignment from the ground up.
How to Fix Running Knee Pain
The Strength Deficit
- Glute bridges: 3 x 15 reps. Weak glutes cause hip drop, which causes the knee to collapse inward. This is the single most common cause of runner's knee.
- Clamshells: 3 x 15 per side. Targets the gluteus medius, the primary hip stabiliser that prevents knee valgus (inward collapse).
- Single-leg step-ups: 3 x 10 per leg. Builds the eccentric quad strength that controls kneecap tracking during the landing phase of running.
- Side-lying leg raises: 3 x 15 per side. Strengthens hip abductors to address the root cause of IT band syndrome.
- Wall sits: 3 x 30 seconds. Isometric quad strength that supports the kneecap without high-impact loading.
- Do these exercises 3 times per week, ideally before running as activation work.
The Foot Mechanics Fix
- Overpronation starts at the foot and cascades upward to the knee. Correcting pronation at the foot corrects tracking at the knee.
- A structured insole with firm arch support and a deep heel cup limits excessive pronation and stabilises the subtalar joint. The Shapes HYROX Edition insole provides this correction for runners.
- If your running shoes are over 500 km old, replace them. Worn midsoles lose their ability to control pronation.
The Running Form Fix
- Increase cadence by 5-10% to reduce overstriding. Overstriding extends the leg too far forward, increasing impact forces on the knee by up to 30%.
- Land with your foot under your hips, not in front of them. This reduces braking forces that stress the kneecap.
- Lean slightly forward from the ankles (not the waist) to use gravity for propulsion rather than fighting it with knee extension.
Short-Term Pain Management
- Reduce running volume by 30-50% until pain subsides. Do not stop entirely unless pain prevents weight-bearing.
- Ice for 15 minutes after running. Apply to the painful area, not the entire knee.
- Foam roll the quads, IT band, and hip flexors for 5 minutes before and after running.
- Replace high-impact running days with cycling or swimming to maintain fitness while unloading the knee.
FAQ
Why do my knees hurt when I run?
Most commonly: weak glutes (causing runner's knee), weak hip abductors (causing IT band syndrome), or overpronation (causing knee misalignment). These are strength and mechanics problems that respond to targeted exercises and foot correction, not permanent damage from running.
What is runner's knee and how do I fix it?
Runner's knee is dull pain around or behind the kneecap caused by the kneecap tracking improperly in its groove. Fix it by strengthening glutes (bridges, clamshells), building quad eccentric strength (step-ups), increasing running cadence, and using a supportive insole to correct pronation.
Can insoles help with knee pain from running?
Yes, when knee pain is driven by overpronation. Studies show orthotics combined with physiotherapy produce better outcomes for patellofemoral knee pain than physiotherapy alone. Insoles correct the foot alignment that causes the kinetic chain to pull the knee out of its natural tracking groove.
Should I stop running if my knees hurt?
Reduce volume first, not stop completely. If pain worsens during running, is sharp, or prevents normal walking, stop and consult a physiotherapist. Mild pain that does not worsen during or after running can be managed with reduced volume plus the strengthening and mechanics fixes above.
What exercises prevent knee pain from running?
Glute bridges, clamshells, single-leg step-ups, side-lying leg raises, and wall sits. These strengthen the muscles that stabilise the knee during running: glutes, hip abductors, and quads. Do them 3 times per week consistently.
Does overpronation cause knee pain?
Yes. When the foot overpronates (rolls inward excessively), the tibia rotates inward, pulling the knee out of its natural alignment. This increases stress on the kneecap and the IT band. Correcting pronation with a structured insole and hip strengthening breaks this chain reaction.
