Flat Feet Academy
Knee pain doesn't always start at the knee. When a flat arch changes how your lower leg rotates during each step, that stress has to go somewhere — and the knee is a common place it ends up.
When a flat, overpronating foot rolls inward more than it should during a step, that inward roll doesn't stay isolated at the ankle — it creates a rotational force that travels up the lower leg. The shinbone rotates inward slightly more than it would with a neutral foot strike, and because the knee joint sits directly above the shin and below the thigh bone, that extra rotation changes the angle at which the kneecap tracks and the alignment the knee joint has to manage with every step. Multiply that by thousands of steps a day, and a small mechanical inefficiency becomes a real source of cumulative strain, often showing up as pain along the inner or front of the knee.
This doesn't mean every case of knee pain is caused by flat feet — plenty of knee pain has nothing to do with foot mechanics. But it's a real, well-documented contributing pathway worth ruling in or out, especially if other explanations haven't panned out.
If the mechanism above matches your situation, a shoe that controls excess inward roll can reduce the rotational stress reaching the knee. That's the same core logic behind our running shoe and overpronation recommendations — stability shoes like the Brooks Adrenaline GTS or firmer options like the ASICS Gel-Kayano address this directly by limiting that inward roll before it reaches the knee.
Strengthening the hip and thigh muscles that control knee alignment independently of footwear also matters, and is a common focus in physical therapy for this exact pattern — shoes reduce the mechanical stress reaching the knee, but they don't replace the muscular control that also plays a role.
See a doctor or physical therapist if knee pain is severe, sudden, accompanied by swelling or instability, or doesn't improve after several weeks of a more supportive shoe and reasonable rest. Foot mechanics are one contributing factor among several possible causes of knee pain, and ruling out ligament, cartilage, or other joint issues is important when self-management isn't working.
Yes, through a well-documented mechanism: excess inward foot roll during walking or running creates rotational stress that travels up the shin to the knee joint, which can contribute to pain, especially on the inner side of the knee. It's not the only possible cause of knee pain, but it's a real contributing pathway.
Not definitely, since knee pain has multiple possible causes. If your pain matches the pattern described above (inner-knee pain worsening with activity, visible overpronation), a supportive shoe is a reasonable, low-risk thing to try first. If it doesn't help within a few weeks, see a doctor or physical therapist.
Either is a reasonable starting point. A podiatrist focuses more on the foot and footwear side, while a physical therapist can assess the full kinetic chain including hip and thigh strength. If your primary concern is knee pain, a physical therapist or your regular doctor is often the more direct first stop.
I'm 32, based in Yerevan, Armenia, and I have grade 2 flat feet myself. Every review, guide, and comparison on this site is based on my own first-hand experience shopping for and wearing footwear, not clinical training. Read more about my approach, or see my medical disclaimer.