Do Orthotics Work? An Honest Look

Last updated: · FIVOR

Few topics in foot health generate more heat. One camp says orthotics are essential and you will need them for life. The other says they are an expensive crutch that weakens your feet and exists mainly to sell you something.

Both positions are overstated. Here is what the evidence actually supports.

What orthotics are supposed to do

The traditional rationale is mechanical: the device changes how load is distributed across the foot, supports the arch, and reduces the strain on the plantar fascia.

That explanation is probably too simple. The more current view is that orthoses work through a combination of altered load distribution, changed muscle activity, and — not trivially — cushioning and comfort. Some of the benefit that gets attributed to biomechanical correction may simply be that the foot is having an easier time.

That is not a criticism. If something reduces your pain, the mechanism is a secondary question. But it does matter for the "you need a precisely engineered custom device" claim.

What the evidence supports

Foot orthoses appear in the JOSPT clinical practice guideline as a reasonable option for plantar heel pain, particularly for short- to medium-term symptom relief.

Note the framing carefully. Not "essential." Not "the definitive treatment." A reasonable option, with the clearest benefit in the shorter term.

The honest summary:

  • They help a meaningful proportion of people. Not everyone, but enough that trying them is sensible.
  • The benefit is clearest early. Short- and medium-term relief is better supported than long-term change.
  • They are low-risk. The main costs are money and comfort.

What the evidence does not support

That you must wear them forever. This is the claim that generates the backlash, and it is the least supported thing in the whole discussion. Nothing in the evidence establishes that once you start, you cannot stop.

The frustration is real and specific — people report being told they must be in orthotics for the rest of their lives, and finding that hard to believe. They are right to push back. That is a stronger claim than the evidence carries.

That custom devices reliably beat good off-the-shelf ones. This is the uncomfortable finding for the industry. Across trials, prefabricated orthoses have generally performed comparably to custom ones for plantar heel pain. There are individual cases with unusual foot shapes or specific deformities where custom genuinely matters — but as a general rule, the price difference is not matched by an equivalent evidence difference.

That they correct anything permanently. An orthotic changes what happens while you are wearing it. It is not reshaping your foot.

That they weaken your feet. The counter-claim is also unsupported. There is no good evidence that wearing orthotics causes lasting weakness.

Where the "scam" reaction comes from

It is worth naming, because it is not irrational.

If you are told you have a permanent structural problem, sold an expensive custom device, told you will need it indefinitely, and then discover that the trial evidence shows off-the-shelf performing comparably and no requirement for permanence — you will feel misled. Reasonably.

The device is not the scam. The overclaim around it is. Orthotics are a legitimate, guideline-recognised option that helps many people. What is not supported is permanence, custom superiority as a general rule, and the framing of a fitted insole as a correction rather than a comfort and load-management aid.

A sensible way to approach them

Start off-the-shelf. Given that prefabricated devices have generally performed comparably in trials, starting with the cheap option is the rational move. If a £20 insert resolves your symptoms, you have your answer.

Judge them on comfort. Comfort is a better predictor of whether an orthotic will help you than any theory about your arch type. If it is uncomfortable, it will not be worn, and an unworn orthotic has an effect size of zero.

Give it several weeks. Not three days. There is usually an adjustment period, and nothing in this condition responds meaningfully in under a fortnight.

Do not treat them as the whole plan. This is the key point. Orthoses manage load; they do not build tissue capacity. The guideline also recommends plantar fascia-specific and calf stretching, and the modern approach adds progressive loading, because degenerated tissue needs a reason to remodel. An orthotic plus nothing else is a symptom strategy.

Consider custom if off-the-shelf genuinely fails, or if you have an unusual foot shape, a significant leg-length difference, or a specific deformity. That is where custom earns its cost.

Try weaning off later. If your symptoms have resolved and you have addressed the calf and the loading, there is no evidence-based reason you must stay in them indefinitely. Reduce gradually rather than stopping overnight.

The factor orthotics do not address

Worth flagging, because it is the biggest one.

In the Riddle (2003) matched case-control study, restricted ankle dorsiflexion showed the strongest association with plantar heel pain — stronger than BMI or hours on your feet.

An orthotic does not change your ankle range of motion. Two minutes a day of calf stretching does, and it costs nothing. If you are going to spend money on one thing and time on another, the free thing is targeting the bigger factor.

FAQ

Custom or off-the-shelf? Start off-the-shelf. Trials have generally found prefabricated devices comparable for this condition. Move to custom if that genuinely fails or you have an unusual foot structure.

Will I need them forever? The evidence does not support that claim. Many people use them through a symptomatic period and reduce afterwards.

Do they weaken your feet? No good evidence supports that either. It is a counter-myth to the permanence myth.

How long before I know? Several weeks. Judge by comfort and by whether the trend over a month is improving, not by day three.

Sources

  • Journal of Orthopaedic & Sports Physical Therapy — Heel Pain–Plantar Fasciitis: Revision 2023 (APTA clinical practice guideline)
  • Riddle DL, Pulisic M, Pidcoe P, Johnson RE. Risk factors for plantar fasciitis: a matched case-control study. Journal of Bone and Joint Surgery (Am), 2003
  • Lemont H, Ammirati KM, Usen N. Plantar fasciitis: a degenerative process (fasciosis) without inflammation. JAPMA, 2003

This article is general education, not medical advice. Persistent heel pain should be assessed by a qualified clinician.