Do Orthotics Help Knee Pain? What the Evidence Shows

How do foot orthotics affect the knee?

The foot, ankle, knee, and hip are mechanically linked. How your foot contacts the ground — and how force travels upward through the leg — influences the load placed on different parts of the knee joint. An orthotic (an insert placed inside the shoe) can subtly alter foot posture and ankle alignment, which in turn shifts the distribution of forces at the knee.

The most studied application is the lateral wedge orthotic for medial knee osteoarthritis (OA), the most common form of knee arthritis, which predominantly affects the inner compartment of the knee. A wedge that tilts the foot slightly outward reduces the "knee adduction moment" — a biomechanical measure of the inward-twisting force across the knee joint that correlates with medial compartment loading. Reducing this force is theoretically protective for the worn cartilage.

What does the evidence say about orthotics and knee osteoarthritis?

Clinical trial results for knee orthotics are mixed, which is why guideline recommendations are cautious rather than strongly for or against:

The AAOS and ACR guidelines on knee OA generally classify orthotics as a low-risk intervention that may benefit some patients, particularly those with valgus or varus malalignment, but the evidence for meaningful pain reduction is modest and inconsistent across trials 1Ref 1Brophy RH, Fillingham YA (2022).AAOS Clinical Practice Guideline Summary: Management of Osteoarthritis of the Knee (Nonarthroplasty), Third Edition.AAOS guideline placing exercise as primary recommendation and orthotics as secondary with mixed evidence for knee OA2Ref 2American Academy of Orthopaedic Surgeons (2021).Management of Osteoarthritis of the Knee (Non-Arthroplasty): Evidence-Based Clinical Practice Guideline, Third Edition.Full AAOS knee OA guideline evidence base.

Exercise therapy consistently outperforms orthotics alone in randomized trials for knee OA 3Ref 3Fransen M, McConnell S, Harmer AR, Van der Esch M, Simic M, Bennell KL (2015).Exercise for osteoarthritis of the knee.Exercise therapy consistently outperforms passive interventions for knee OA pain and function. The most durable improvements in pain and function come from quadriceps strengthening, aerobic exercise, and weight management — not from passive interventions like insoles. Orthotics are best understood as an adjunct that may make exercise more comfortable, not as a primary treatment.

For people with patellofemoral pain (pain under or around the kneecap, sometimes called runner's knee), orthotics that correct overpronation may reduce pain by improving patellar tracking during loading activities. Evidence in this subgroup is somewhat more favorable.

Custom vs. over-the-counter orthotics — does it matter?

Custom orthotics are individually molded to your foot shape by a podiatrist or orthotist, typically at considerably higher cost than prefabricated insoles. For knee pain, the evidence does not consistently show that custom orthotics outperform good-quality prefabricated options. Many patients try an OTC insole (available at pharmacies) first and find adequate benefit.

Custom orthotics are more likely to add value when:

• Foot or ankle deformity is significant (severe flat feet, high rigid arches)
• Prefabricated options have failed
• You have a specific biomechanical problem identified on assessment by a podiatrist or PT

A podiatrist specializes in foot and ankle conditions and orthotics; a physical therapist can assess the biomechanical chain and advise on whether orthotics are likely to help your specific knee pain pattern.

What is more important than orthotics for knee pain?

The AAOS knee OA guideline assigns its strongest recommendations to:

1. Exercise therapy — especially quadriceps strengthening 1Ref 1Brophy RH, Fillingham YA (2022).AAOS Clinical Practice Guideline Summary: Management of Osteoarthritis of the Knee (Nonarthroplasty), Third Edition.AAOS guideline placing exercise as primary recommendation and orthotics as secondary with mixed evidence for knee OA3Ref 3Fransen M, McConnell S, Harmer AR, Van der Esch M, Simic M, Bennell KL (2015).Exercise for osteoarthritis of the knee.Exercise therapy consistently outperforms passive interventions for knee OA pain and function 2. Weight management — each pound of body weight reduction reduces knee joint load by a greater multiple during activities like stair descent 3. NSAIDs (when appropriate and tolerated) 4. Physical therapy — to address movement mechanics comprehensively

Orthotics sit in a secondary tier — potentially helpful, low-risk, worth trying, but unlikely to produce the same magnitude of benefit as consistent exercise. Gale can help you connect with a physical therapist or podiatrist to evaluate whether orthotics are right for your situation.