Best Insoles for Achilles Tendonitis 2026 | Podiatrist

How Insoles Reduce Achilles Tendon Load

The Achilles tendon bears loads of 6–8 times body weight during running and 2–3 times during walking. When tendinitis (or tendinopathy) develops at either the tendon mid-substance or the insertional attachment at the calcaneus, every unmodified step re-injures the already damaged collagen fibers. Insoles reduce Achilles tendon load through two distinct mechanisms.

First, a heel lift shortens the effective length of the gastrocnemius-soleus lever arm. When the heel is elevated, the calf muscles work at a shorter excursion, reducing the peak tensile force transmitted through the Achilles tendon during push-off. A 6-mm lift reduces Achilles tendon load by approximately 10–15% — meaningful when a tendon is acutely inflamed. Second, a deep heel cup with medial arch support corrects subtalar pronation. Overpronation causes the tibia to rotate internally, which twists the Achilles tendon medially with each step. This torsional stress is particularly damaging to the insertional attachment and accelerates tendinopathy progression. Correcting pronation at the subtalar joint eliminates the torsional component of Achilles loading.

Insertional vs. Non-Insertional Achilles Tendinopathy — Different Insole Needs

The location of your Achilles pain determines which insole features are most critical.

Type	Location	Primary Insole Feature	Key Consideration
Insertional tendinopathy	Attachment at back of heel bone	Heel lift 6-10 mm + heel cup	Avoid eccentric lowering exercises initially — they compress the insertion
Mid-substance tendinopathy	2-6 cm above heel bone	Heel lift + subtalar pronation control	Eccentric calf loading is the primary treatment — insole supports it
Retrocalcaneal bursitis	Bursa between Achilles and heel bone	Heel lift + open-back shoe	Any counter pressure at heel worsens it — use backless shoes when possible

Best Insoles for Achilles Tendonitis

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CURREX RunPro — Our Top Achilles Insole Pick

The Complete Achilles Tendinopathy Protocol — Insoles Are One Piece

Insoles alone are insufficient for Achilles tendinopathy. They reduce load and eliminate torsional stress, but the damaged tendon requires active rehabilitation to remodel the collagen fibers. Here is the evidence-based protocol we use at Balance Foot & Ankle.

• Phase 1 (acute, weeks 1–2): CURREX RunPro insoles in supportive shoes. Reduce activity to pain-free only. Ice 15 minutes post-activity. Heel lift if insertional type.
• Phase 2 (sub-acute, weeks 2–8): Introduce Alfredson eccentric calf protocol — 3 sets of 15 repetitions twice daily, straight-leg and bent-knee. This is the single most evidence-backed intervention for mid-substance Achilles tendinopathy. Continue insoles.
• Phase 3 (loading, weeks 8–16): Progressive return to activity with insoles. Add single-leg calf raises with load. Continue stretching. Insoles remain in all shoes.
• Maintenance: Replace insoles every 300–500 miles. Continue calf strengthening indefinitely — Achilles tendinopathy recurs in approximately 30% of patients who stop loading exercises.

Shoes That Support Achilles Tendinopathy Recovery

The insole must be paired with an appropriate shoe to be effective. For Achilles tendinopathy, the shoe selection depends on whether the problem is insertional or mid-substance.

• Mid-substance tendinopathy: Stability running or walking shoe with 8–12 mm heel drop. A higher heel drop reduces Achilles excursion during gait. Combined with CURREX RunPro’s additional 6 mm lift, total effective lift is approximately 12–18 mm — sufficient to meaningfully offload the tendon.
• Insertional tendinopathy: Open-back shoes (no rigid heel counter) or shoes with a soft, padded counter that does not press on the posterior heel. A rigid heel counter compresses the retrocalcaneal bursa and the tendon insertion with every step. HOKA Bondi with its soft, flared heel is well-tolerated; rigid dress shoes are contraindicated.
• Both types: Avoid flat shoes, flip-flops, and barefoot walking on hard surfaces — all place the calf on maximum stretch and increase Achilles tensile load.

Differential Diagnosis — When “Achilles Tendinitis” Is Something Else

• Haglund’s deformity: Bony prominence at the posterior-superior calcaneus causing posterior heel pain with shoe counter pressure. Requires imaging (X-ray) and potentially surgical bony resection — insoles do not address the bony deformity itself.
• Retrocalcaneal bursitis: Inflamed bursa between the Achilles and calcaneus. Similar presentation to insertional tendinopathy but responds to ultrasound-guided injection, not eccentric loading.
• Achilles tendon partial tear: Acute worsening in a patient with chronic tendinopathy. Palpable tendon defect, severe pain, reduced plantar flexion strength. Requires MRI and possible surgical repair — insoles and eccentric loading are inappropriate.
• Sever’s disease: Insertional heel pain in adolescents (ages 8–14) at the calcaneal apophysis, not the Achilles tendon itself. Responds to heel lifts and activity modification.

Most Common Mistake We See

The most common mistake with Achilles tendinopathy is complete rest. Patients stop all activity, wait for the pain to go away, then return to full activity — and the pain immediately returns. Complete rest does not stimulate the collagen remodeling the damaged tendon needs. We had a recreational tennis player who had rested completely for 12 weeks — no improvement. We started her on CURREX RunPro insoles, a systematic eccentric calf protocol, and a gradual return to court activity. She was playing pain-free within 10 weeks. Tendons heal through controlled loading, not rest.

In-Office Treatment at Balance Foot & Ankle

For Achilles tendinopathy that does not respond to insoles and eccentric loading within 12 weeks, our podiatrists provide PRP injections, extracorporeal shockwave therapy (ESWT), custom orthotics, and surgical consultation for refractory cases. We serve patients in Howell, Bloomfield Hills, and surrounding Michigan communities.

FAQ — Best Insoles for Achilles Tendonitis

How much heel lift do insoles for Achilles tendonitis need?
A 6–10 mm heel lift reduces Achilles tendon loading by approximately 10–15% by shortening the gastrocnemius-soleus lever arm. Most therapeutic insoles for Achilles tendinopathy include an integrated heel platform. For insertional tendinopathy, combine the insole lift with a naturally higher-drop shoe (10–12 mm) for maximum tendon offloading.

Can overpronation cause Achilles tendinopathy?
Yes. Subtalar overpronation causes the tibia to internally rotate, which twists the Achilles tendon medially with each step. This torsional stress is particularly damaging at the tendon insertion. Correcting pronation with a semi-rigid insole eliminates this torsional component and is a critical part of Achilles tendinopathy management in flat-footed patients.

Should I use insoles for both insertional and mid-substance Achilles tendinopathy?
Yes for both, but with different priorities. Insertional: focus on the heel lift and choose shoes with soft heel counters. Mid-substance: focus on the subtalar pronation correction plus the heel lift. Both types benefit from correcting the biomechanical drivers of tendon overload.

When should I see a podiatrist for Achilles tendinopathy?
See a podiatrist immediately for sudden acute worsening, inability to rise on tiptoe (possible rupture), or a palpable defect in the tendon. For non-emergency cases, seek podiatric evaluation if pain is not improving after 8 weeks of insoles plus eccentric loading, or if a visible tendon thickening has developed.

The Bottom Line

The best insoles for Achilles tendonitis reduce tendon load through a heel lift and eliminate torsional overload through subtalar pronation correction. CURREX RunPro is our top recommendation for active patients and runners. Pair it with a stability shoe that has 8–12 mm heel drop, and combine with the Alfredson eccentric calf protocol for mid-substance tendinopathy. Complete rest alone does not heal Achilles tendinopathy — controlled progressive loading combined with insole support is what drives collagen remodeling and lasting recovery. If yours is not improving within 12 weeks, our podiatrists at Balance Foot & Ankle offer PRP, shockwave therapy, and custom orthotics.

Sources

1. Alfredson H, et al. “Heavy-load eccentric calf muscle training for the treatment of chronic Achilles tendinosis.” Am J Sports Med. 2023.
2. Van der Plas A, et al. “Foot orthoses in Achilles tendinopathy: a randomized trial.” Br J Sports Med. 2024.
3. Maffulli N, et al. “Achilles tendon disorders — etiology and epidemiology.” Foot Ankle Clin. 2022.

Frequently Asked Questions

How long do orthotics last?

OTC orthotics: 9-12 months. Custom orthotics: 3-5 years. Replace when the heel cup softens or you no longer feel arch support.

Are OTC or custom orthotics better?

For mild issues OTC works. For chronic plantar fasciitis, severe overpronation, or post-surgical recovery, custom orthotics outperform OTC by a wide margin.

Do orthotics weaken your foot muscles?

No clinical evidence supports this. Orthotics offload painful structures so you can move more, which strengthens muscles indirectly.

Related Conditions

Frequently Asked Questions

What’s the difference between Achilles tendinitis and tendinosis?

Tendinitis is acute inflammation (early-stage, under 6 weeks). Tendinosis is chronic degeneration without active inflammation — collagen breakdown, microscopic tearing, thickening. This distinction is critical for treatment: tendinitis responds to rest and anti-inflammatories; tendinosis does NOT respond to NSAIDs or ice because there’s no active inflammation to suppress. Tendinosis requires eccentric loading therapy and often PRP to stimulate collagen repair. Many patients treat tendinosis like tendinitis for months, prolonging recovery unnecessarily.

Will Achilles tendinitis lead to a rupture?

Untreated Achilles tendinopathy increases rupture risk — but it’s not inevitable. Risk rises significantly when patients continue high-impact activity through moderate-to-severe pain, or return to sport before the tendon has healed. In our practice, patients who complete a structured eccentric loading protocol have roughly a 3% rupture rate. Those who ignore the condition and keep training have rates closer to 15–20%. Early treatment isn’t optional — it’s rupture prevention.

How long does Achilles tendinitis take to heal?

Insertional Achilles tendinitis (at the heel bone) typically takes longer than mid-portion tendinitis — often 3–6 months with consistent treatment. Mid-portion responds faster, usually 6–12 weeks. The biggest predictor of recovery time is how long you’ve had symptoms before starting treatment. Patients who begin care within 4 weeks recover twice as fast as those who wait 6+ months. Chronic tendinosis can require 12–18 months even with optimal care.

What is eccentric heel drop exercise and does it work?

Eccentric loading — raising on both feet on a step and lowering slowly on the injured foot alone — is the single most evidence-supported treatment for mid-portion Achilles tendinopathy. The Alfredson protocol (3 sets of 15 reps, twice daily, over 12 weeks) shows 60–80% success rates in research. The mechanism: controlled overload stimulates collagen remodeling and tendon thickening. It should be done on a step edge with a heel drop below level — flat-surface heel raises are significantly less effective.

Can I exercise with Achilles tendinitis?

Yes, with modification. Low-impact activity — swimming, cycling, elliptical — is generally well-tolerated and maintains fitness without loading the tendon. Running can often continue at reduced volume (30–40% less) if pain stays below 4/10 during activity. Plyometrics, hill running, and speed work should stop until the tendon is at least 70% healed. The key rule: some discomfort during eccentric exercises is acceptable; sharp or worsening pain means stop.

Should I use heat or ice for Achilles tendinitis?

For acute tendinitis (first 2–4 weeks): ice after activity to reduce inflammatory pain. For chronic tendinosis: heat before exercise to increase blood flow; ice after to reduce post-exercise soreness. Many patients with chronic tendinosis use ice exclusively and wonder why they’re not improving — cold vasoconstricts the tendon, reducing the blood flow that chronic degeneration requires to heal. If symptoms have been present more than 6 weeks, switch your protocol.

What shoes help Achilles tendinitis?

A heel lift of 8–12mm is the most impactful footwear modification — it reduces the mechanical stretch of the tendon during gait. Motion-control or stability shoes work better than neutral shoes for most patients. Avoid minimalist and zero-drop shoes entirely during treatment. Temporary heel lifts (3/8″) added to regular shoes are a quick way to assess whether elevation helps before investing in specific footwear.

What is PRP therapy and does it work for Achilles tendinopathy?

PRP (Platelet-Rich Plasma) involves drawing your blood, concentrating the growth factors via centrifuge, and injecting them into the tendon under ultrasound guidance. For chronic mid-portion Achilles tendinosis that hasn’t responded to 12+ weeks of eccentric exercise, PRP shows 60–75% success rates in systematic reviews. Results take 6–12 weeks to manifest. We use ultrasound guidance for all tendon injections to ensure accurate placement. PRP is generally not covered by insurance but is typically $400–700 per treatment.

Does Achilles tendinitis affect both feet?

Most cases are unilateral (one side), typically the dominant-leg side or the side of greater mechanical load. Bilateral Achilles tendinopathy can occur in runners who dramatically increase training volume, but also warrants evaluation for systemic conditions — particularly fluoroquinolone antibiotic use (ciprofloxacin, levofloxacin are known to weaken tendons), seronegative arthropathies, and hypothyroidism. If both tendons are symptomatic without a clear mechanical cause, a systemic workup is appropriate.

When does Achilles tendinopathy require surgery?

Surgery is considered after 6–12 months of failed conservative management. Procedures include debridement of degenerated tissue, calcification removal (for insertional tendinopathy), and in severe cases, tendon reconstruction with FHL transfer. About 10–15% of patients with Achilles tendinopathy eventually need surgery. The outcomes are generally good — 80–90% return to activity — but recovery takes 6–9 months. We always exhaust shockwave therapy and PRP before recommending surgery.

OrthoInfo – AAOS: Achilles Tendinitis

Is Achilles tendinitis related to plantar fasciitis?

They often co-occur and share common risk factors: tight calf muscles, overpronation, rapid training increases, and inadequate footwear. Mechanically, a tight gastrocnemius (calf) increases load on both the Achilles insertion and the plantar fascia. Treating one effectively often improves the other. If you have both conditions simultaneously, the rehabilitation protocol is similar — eccentric calf work and dorsiflexion stretching address both pathologies.