Insoles help knee pain when the pain is being driven by how your foot behaves on the ground, and they do very little when it is not. If your arch collapses inwards as you walk, your shin rotates inwards with it, and your kneecap is pulled slightly off its track thousands of times a day. Supporting the arch reduces that inward roll and takes load off the front and inside of the knee. This is why insoles for knee pain tend to work well for patellofemoral pain (often called runner's knee) and for knee pain linked to flat feet or overpronation, and why they rarely fix knee pain caused by an acute ligament tear, a meniscus injury or advanced joint damage. Below, a SOLE5 podiatrist explains how to tell which group you are in.
In this article
- How can your feet cause knee pain?
- Which types of knee pain respond to insoles?
- What does the research actually say?
- 5 signs your knee pain is coming from your feet
- How do you choose insoles for knee pain?
- How long do insoles take to help knee pain?
- When are insoles not the answer?
- Frequently asked questions
How can your feet cause knee pain?
Your knee is a hinge caught between two joints that rotate. The hip turns the thigh bone from above, and the foot and ankle turn the shin bone from below.
When the foot rolls inwards excessively during the stance phase of walking or running, a pattern known as overpronation, the shin bone rotates internally along with it. That rotation changes the angle at which the kneecap glides in its groove and increases compressive load on the cartilage behind it. Repeat that over a 10,000 step day and a small alignment becomes a persistent ache.
The same mechanism runs upstream, which is why poor foot posture is also commonly involved in hip pain and lower back pain. Knee pain is often just the loudest link in that chain.
Which types of knee pain respond to insoles?
Not all knee pain is caused by poor foot mechanics. The table below reflects how podiatrists typically triage knee pain in clinic.
| Type of knee pain | Typical presentation | Likely to respond to insoles? |
|---|---|---|
| Patellofemoral pain (runner's knee) | Dull ache around or behind the kneecap, worse on stairs, squats and after sitting | Good |
| Knee pain with flat feet or overpronation | Inner knee ache, arches collapse when standing, shoes wear on the inner edge | Good |
| Load related knee pain from standing or walking all day | Both knees ache by late afternoon, better with rest and better shoes | Moderate to good |
| Early osteoarthritis | Morning stiffness, inner knee pain, age typically over 50 | Variable, useful as part of a broader plan |
| Ligament or meniscus injury | Sudden onset, swelling, locking, giving way, a twisting incident | Unlikely, see a clinician first |
If your pattern sits in the first three rows, arch support is a sensible first step. Our knee pain page explains the biomechanics in more detail.
Podiatrist designed arch support, a stabilising heel cup to control inward roll, and a metatarsal dome that redistributes pressure under the ball of the foot. Built for running shoes, gym shoes and long days on your feet.
What does the research actually say?
The most useful study here is an Australian randomised clinical trial published in the BMJ in 2008. Researchers in Brisbane randomised 179 adults aged 18 to 40 with patellofemoral pain into four groups: off the shelf foot orthoses, flat inserts, multimodal physiotherapy, or orthoses plus physiotherapy.
Three findings matter for anyone deciding what to buy:
- Foot orthoses beat flat inserts at six weeks. The shape did the work, not simply having something extra in the shoe.
- Orthoses performed about as well as physiotherapy. Neither approach was clearly superior over the short term.
- Adding orthoses to physiotherapy gave no extra benefit, and all four groups improved meaningfully by 52 weeks.
Read honestly, that is a reasonable case for supportive insoles as a low effort, low risk first step, and a reminder that they are not a replacement for strengthening. The American Academy of Orthopaedic Surgeons makes a similar point about patellofemoral pain: hip and quadriceps strength usually needs attention too.
5 signs your knee pain is coming from your feet
- Your arches flatten noticeably when you stand. Compare sitting to standing in front of a mirror. A visible drop suggests flat feet.
- Your shoes wear down on the inner edge. Line up an old pair on a bench and look at them from behind. Inward lean at the heel counter points to overpronation.
- The pain is worse in flat, unsupportive shoes. Canvas sneakers, thongs and flat work shoes leave the arch unsupported all day.
- Both knees ache, without any injury. A symmetrical ache with no incident is more consistent with a load and alignment problem than with tissue damage.
- You also get foot, shin or lower back symptoms. Heel pain, shin splints or a stiff lower back alongside knee pain suggests a chain issue rather than an isolated knee issue.
Three or more of these is a strong hint that your feet deserve attention before anything else.
How do you choose insoles for knee pain?
For knee pain, structure matters far more than cushioning. A soft gel pad feels pleasant underfoot but does nothing to control the inward rotation driving the problem. Look for four things.
- Genuine arch support with some firmness. The insole should resist being flattened by hand. If it collapses easily, it will collapse under your body weight too.
- A stabilising heel cup. This cradles the heel bone and limits how far it rolls inward at ground contact, which is where the rotation chain starts.
- Forefoot support. A metatarsal dome spreads load across the ball of the foot instead of concentrating it, which helps keep your push off position consistent.
- Full length if the pain is activity related. Running, gym work and long shifts all benefit from support underfoot for the whole stride.
SOLE5 insoles are designed by Australian podiatrists and are included in the Australian Register of Therapeutic Goods (ARTG 441576) as a Class 1 medical device. You can compare the full range on our shop page.
Both the Full Length and Half Length insoles, so your arches stay supported in trainers and in work or casual shoes. Consistency across the day is what changes knee load, not support in one pair only.
How long do insoles take to help knee pain?
Expect a settling period before you judge them. Most people notice their walking pattern feels different within a few days, some easing of symptoms in 2 to 3 weeks, and a clearer picture at the 6 week mark, which matches the follow up point used in the research above. Mild arch or calf awareness during this period is normal as the tissues adapt. Sharp pain is not, and it means you should scale back the hours and check the fit.
When are insoles not the answer?
See a podiatrist, physiotherapist or GP rather than reaching for insoles if your knee locks, gives way or swells, if the pain followed a twist or impact, if you cannot bear weight, or if there is redness and heat around the joint. These suggest a structural or inflammatory problem that support underfoot will not address.
Insoles are also only half the job for most people. Quadriceps and gluteal strengthening remains the best supported long term treatment for patellofemoral pain. Think of the insole as reducing the load reaching the knee while you build the strength to handle it.
Frequently asked questions
Can flat feet cause knee pain?
Yes. Flat feet allow the arch to collapse inwards during walking, which rotates the shin bone internally and pulls the kneecap slightly off its normal track. Supporting the arch reduces that inward rotation, which is why knee pain associated with flat feet often responds well to orthotic insoles.
Do insoles help arthritis knee pain?
Results are mixed and depend on the pattern of wear in the joint. Insoles are most useful for early inner compartment osteoarthritis, where improving foot alignment can reduce load on the affected side of the knee, and they are best used alongside strengthening, weight management and advice from your treating clinician. They will not reverse existing joint damage.
Should I wear insoles in both shoes if only one knee hurts?
Yes, always wear a pair including left and right. Placing an insole in one shoe only creates a leg length and alignment difference that can shift the problem to the other side or into the hip and lower back. Both feet contribute to how you load your body, so both should be supported equally.
Can insoles make knee pain worse?
They can temporarily. Introducing arch support changes how your joints are loaded, so mild arch, calf or knee awareness in the first two weeks is normal while your body adapts. Reduce your wearing hours and seek advice if it feels very painful and it does not settle.
Are custom orthotics better than off the shelf insoles for knee pain?
Not necessarily. The 2008 Australian randomised trial in patellofemoral pain used off the shelf foot orthoses and found they improved symptoms more than flat inserts at six weeks, performing comparably to physiotherapy. Well designed prefabricated insoles are a reasonable first step for most people, while custom devices are usually reserved for significant deformity, large limb length differences or cases that have not responded to good quality off the shelf support.
Take the load off your knees
Podiatrist designed arch support, a stabilising heel cup and a metatarsal dome, engineered in Australia to keep your feet, knees and hips better aligned all day.
Shop Full Length Orthotic Insoles →References:
- Mayo Clinic - Knee Pain
- AAOS OrthoInfo - Patellofemoral Pain Syndrome
- Cleveland Clinic - Overpronation
- AAOS OrthoInfo - Orthotics
- Collins N, et al. (2008). Foot orthoses and physiotherapy in the treatment of patellofemoral pain syndrome: randomised clinical trial. BMJ, 337, a1735
|
|
|
