Insoles help some Achilles tendonitis cases and do nothing for others — the deciding factor is whether pain sits at the heel bone or in the tendon above it.
Two people with the same diagnosis can need opposite inserts. Pain right where the tendon meets the heel bone calls for a heel lift and a softer, non-rubbing shoe. Pain in the tendon’s midportion justifies arch support only when a clinician finds a documented alignment problem. Get that split wrong and the insert makes things worse instead of better.
Below is the decision process clinicians actually use, the fitting steps that prevent a wasted purchase, and the mistakes that keep people cycling through inserts that never help.
Where Is the Pain? The Answer Splits Two Ways
Insertional Achilles tendinopathy and midportion Achilles tendinopathy respond to different inserts, so locating the pain comes before shopping. The American Academy of Orthopaedic Surgeons (AAOS) describes insertional pain as sitting at the back of the heel, often aggravated by shoe pressure and sometimes by a bony spur.
For insertional pain, AAOS guidance supports a heel lift, a cushioned heel, and footwear that doesn’t press on the back of the heel — open-backed shoes or clogs can reduce irritation while symptoms settle. Note the framing: the lift changes how the tendon loads, and the shoe change removes direct pressure. Neither one heals the tendon alone.
Midportion pain sits a little higher, in the tendon body above the heel. Here the picture is murkier. The 2024 clinical practice guideline published in the Journal of Orthopaedic & Sports Physical Therapy reviewed the orthosis evidence, found it contradictory, and made no general recommendation for foot orthoses or heel lifts in Achilles tendinopathy.
That absence of a blanket recommendation still leaves room for a targeted one. The same guideline allows a clinician to prescribe an orthosis when abnormal foot alignment or another foot impairment is documented — and permits temporary heel lifts for midportion cases.
Match the Insole Type to Your Situation
Once the pain location is clear, the insert type follows from it. The table below compresses the selection logic a clinician walks through.
| Insole Feature | Who It Fits | What to Watch |
|---|---|---|
| Heel lift (12–15 mm typical) | Insertional pain; temporary trial in midportion cases | Clinical figure, not a consumer spec; excess height alters gait |
| Cushioned heel cup | Heel pressure from the shoe counter | Must not create slippage or new pressure points |
| Prefabricated arch support | Documented overpronation or alignment problem | Not routine for every case; needs a clinical assessment first |
| Custom orthosis | Impairment a clinician confirms on gait exam | Cost and lead time; evidence varies by presentation |
| Full-length replacement insole | Shoe with enough internal volume | Remove the factory insole; never stack inserts unadvised |
| Thin flat insert | Rarely useful here | Little cushioning or heel support to offer |
| Firm plastic orthotic | Selected alignment cases only | Rigid materials can increase heel pressure |
AAOS framing matters throughout: insoles are an adjunct. Supportive shoes, load modification, and clinician-directed rehabilitation carry the treatment, and an insert that’s asked to do the whole job will disappoint.
Fitting Steps That Prevent Wasted Money
Fit the shoe before the insole, and introduce the insert gradually. Most failed purchases trace back to an insert jammed into a shoe that couldn’t accommodate it.
- Confirm the diagnosis if you’re unsure which type you have. A physical therapist or podiatrist can locate the pain and assess gait.
- Check the shoe first. It should be supportive, cushioned, wide enough, and free of rubbing at the back of the heel.
- Remove the factory insole if you’re fitting a full-length replacement, and only if the shoe is built for it. Don’t stack inserts unless a clinician tells you to.
- Wear the insert for short stretches at first and watch pain during walking and the next day. Stop if it causes numbness, blisters, instability, or worsening pain.
- Match the lift height in both shoes unless a clinician prescribes otherwise — uneven height throws off gait and balance.
A lift should feel like less strain, not like walking on a wedge. If your calf, knee, or foot starts complaining, the height is too much. Our tested roundup of insoles for achilles tendonitis covers specific models worth comparing, though the fit logic above still governs which one you pick.
Mistakes That Keep People Cycling Through Inserts
Most insert failures are selection errors, not product defects. Assuming every Achilles problem needs arch support is the first one — insertional pain often needs the opposite: less pressure at the heel, not more lift under the arch.
Buying a heel lift purely by advertised height is the second. A 12–15 mm lift shows up in clinical descriptions as a typical adjunct figure, not a universal specification, and too much elevation can push symptoms upward into the calf or knee.
Wearing the lift in one shoe only, combining a thick insole with a tight shoe, and continuing to walk barefoot or in flat shoes when those aggravate symptoms round out the common errors. AAOS also flags heel-drop exercises as appropriate only for noninsertional Achilles tendinitis, never for insertional disease.
One more: inserts are not a substitute for evaluation when pain is severe or arrives suddenly. A pop, immediate weakness, inability to push off, or a palpable gap in the tendon signals a possible rupture and needs urgent medical assessment — not a new insole. Marked swelling, redness, warmth, or rest pain also warrants a professional opinion. If symptoms persist despite reasonable load reduction and treatment, the next step is an exam, not another insert purchase.
Common Questions
Can a heel lift make Achilles pain worse?
Yes, if it’s too tall or worn in only one shoe. Excessive elevation changes ankle position and gait, which can shift strain to the calf, knee, or foot. The clinical literature describes 12–15 mm as a typical adjunct figure, not a target for everyone. Start low, introduce it gradually, and stop if new pain appears elsewhere.
Do I need custom orthotics or will an off-the-shelf pair work?
Off-the-shelf inserts handle many heel-pressure and cushioning needs. Custom orthotics make more sense when a clinician documents abnormal foot alignment or another impairment on gait exam. The 2024 guideline found the orthosis evidence contradictory and made no blanket recommendation, so the choice should follow an assessment rather than a product category.
How long before I know an insole is helping?
Give it a week or two of gradual wear and judge by pain during activity and the following day. Improvement should be steady, not dramatic. Insoles work alongside supportive shoes, load modification, and rehabilitation — not instead of them. If nothing changes or symptoms worsen, stop and get the tendon examined rather than trying a different insert.
Sources
- American Academy of Orthopaedic Surgeons. “Achilles Tendinitis.” Supports the insertional vs. midportion distinction, heel lift and footwear guidance, and heel-drop exercise caution.
- Journal of Orthopaedic & Sports Physical Therapy. “Achilles Pain, Stiffness, and Muscle Power Deficits: Midportion Achilles Tendinopathy Revision 2024.” Supports the 2024 clinical practice guideline findings on orthoses and heel lifts.