Achilles Tendonitis Treatment: Exercises, Therapies & Recovery Timeline

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Achilles tendonitis — more accurately called Achilles tendinopathy — is one of the most common and frustrating overuse injuries in runners, athletes, and active adults. The Achilles tendon is the largest tendon in the body and is subjected to forces of 6–8 times body weight during running. When cumulative load exceeds the tendon’s adaptive capacity, degeneration and pain result. The good news: the right treatment program resolves the majority of cases without surgery.

Mid-Portion vs. Insertional Achilles Tendinopathy

There are two distinct types of Achilles tendinopathy, and distinguishing them is critical because treatment differs significantly:

Mid-Portion Tendinopathy

Pain located 2–6 cm above the heel bone insertion. This is the more common presentation, typically affecting runners and athletes. The tendon may have a visible or palpable thickening (nodule) at the painful area. This location has a relatively good blood supply and responds well to eccentric loading exercises.

Insertional Tendinopathy

Pain directly at the posterior calcaneus where the Achilles inserts. Often associated with a bony spur at the insertion (enthesophyte) and sometimes with Haglund’s deformity (a prominent posterior heel prominence). This type is more common in older, heavier, or less active individuals and in those with inflammatory arthritis. It responds less well to eccentric exercises that stretch the tendon below neutral — a different loading protocol is required.

Symptoms of Achilles Tendinopathy

• Pain and stiffness at the back of the heel or lower leg, especially with the first steps in the morning
• Pain that “warms up” with activity but returns after stopping
• Tenderness on direct pressure at the tendon (mid-portion) or heel insertion
• Visible or palpable thickening, nodule, or swelling in the tendon
• Pain with hill running, stairs, or explosive push-off movements
• In severe cases: pain with walking, inability to perform a single-leg heel raise
• Red flag: sudden severe “pop” with acute inability to push off = possible complete tendon rupture — requires immediate evaluation

Risk Factors

• Rapid increase in running mileage or training intensity
• Tight gastrocnemius and soleus muscles (reduces tendon compliance)
• Overpronation — increases torsional forces on the tendon
• Sudden footwear change (e.g., switching to minimalist shoes too quickly)
• Running on hills or hard surfaces
• Male sex (Achilles tendinopathy is 3× more common in men)
• Age 35–65 (peak incidence)
• Fluoroquinolone antibiotic use (increases tendon rupture risk)
• Anabolic steroid use

Evidence-Based Treatment

1. Eccentric Calf Raises (Alfredson Protocol) — The Gold Standard

The Alfredson eccentric protocol has the strongest evidence base for mid-portion Achilles tendinopathy, with studies showing 60–90% success rates. Eccentric exercises create controlled tensile load that stimulates tendon remodeling from degenerative collagen to stronger, organized Type I collagen.

Protocol for mid-portion tendinopathy:

1. Stand on a step with heel hanging off the edge; rise on both feet
2. Shift all weight to the affected foot
3. Slowly lower the heel below step level over 3 seconds (eccentric phase)
4. Return to starting position using the unaffected leg or both legs (no concentric loading)
5. Perform with knee straight (loads gastrocnemius) AND knee bent to 45° (loads soleus)
6. Do 3 sets of 15 reps for each position, twice daily, 7 days a week
7. Continue for 12 weeks — do not stop at 6 weeks even if pain improves
8. Exercise through mild-to-moderate pain (3–5/10) — this is expected and appropriate

For insertional tendinopathy: Use the same protocol but do NOT drop the heel below neutral — this compresses the tendon at the insertion and worsens insertional disease. Keep the heel in neutral or slightly elevated throughout.

2. Load Management

Complete rest is counterproductive for tendinopathy — tendons need load to heal. The goal is reducing provocative loads while maintaining therapeutic ones. Temporarily reduce mileage by 30–50%, eliminate hills and speed work, and replace with low-tendon-stress cross-training (cycling, swimming). Maintain the eccentric program throughout.

3. Footwear and Heel Lifts

A 12mm heel lift temporarily reduces Achilles tendon strain by decreasing the plantarflexion range required. This is particularly helpful for insertional tendinopathy and during the early painful phase of rehabilitation. As symptoms improve over 6–8 weeks, gradually wean off the heel lift to restore normal tendon loading. Avoid flat shoes and barefoot walking during active treatment.

4. MLS Laser Therapy

MLS (Multiwave Locked System) laser therapy delivers two synchronized wavelengths that reduce tendon inflammation and stimulate mitochondrial ATP production — accelerating cellular repair. Multiple clinical studies support its efficacy for Achilles tendinopathy, both mid-portion and insertional. A course of 6–10 sessions produces significant pain reduction and histological improvement in tendon structure. At Balance Foot & Ankle, MLS laser is used alongside the eccentric exercise program for faster recovery.

5. Shockwave Therapy (EPAT)

Extracorporeal pulse activation technology (EPAT/shockwave) delivers high-energy acoustic waves that stimulate tendon neovascularization and collagen synthesis. It’s particularly effective for chronic Achilles tendinopathy (>3 months) that has failed eccentric exercise. A series of 3–5 sessions provides lasting improvement in 60–80% of patients with chronic tendinopathy.

6. PRP Injection

Ultrasound-guided platelet-rich plasma injection delivers concentrated growth factors (PDGF, TGF-β, VEGF) directly into the degenerative tendon tissue to stimulate healing. Evidence is strongest for chronic mid-portion tendinopathy that has failed eccentric exercises and shockwave therapy. It is an alternative to cortisone that doesn’t carry the risk of tendon weakening.

Cortisone Injections — Use With Caution

Corticosteroid injections into the Achilles tendon are generally avoided due to the significant risk of tendon rupture — multiple studies have demonstrated that cortisone injections around the Achilles weaken the tendon and increase rupture risk by 2–4×. Peritendinous (around but not into the tendon) injections are safer and may reduce peritendinous inflammation in early cases. PRP and shockwave are preferred alternatives.

Recovery Timeline

Achilles tendinopathy has a notoriously slow recovery timeline due to the tendon’s relatively poor blood supply. Realistic expectations:

• Mild mid-portion tendinopathy — 6–10 weeks of eccentric training with activity modification
• Moderate tendinopathy — 3–4 months with eccentric program ± MLS laser or shockwave
• Chronic insertional tendinopathy — 4–6 months; heel lift + modified eccentric protocol + shockwave therapy
• Post-surgical — 4–6 months for return to running after tendon debridement

The most common reason for prolonged recovery is returning to running before the tendon has fully adapted — this creates a cycle of re-injury. Use the single-leg heel raise test: if you cannot perform 25 pain-free single-leg heel raises, you are not ready for return to running.

When Is Surgery Needed?

Surgery is reserved for patients who fail 6+ months of dedicated conservative care including eccentric loading, MLS laser, and shockwave therapy. Surgical options include:

• Tendon debridement — removal of degenerative tendon tissue; most common for mid-portion disease
• Calcification removal — for insertional tendinopathy with large, painful enthesophyte
• Haglund’s resection — removal of posterior heel bone prominence in insertional disease
• Tendon transfer (FHL) — for severe tendon degeneration where insufficient healthy tendon remains; the flexor hallucis longus tendon is used to augment the Achilles

Frequently Asked Questions

Achilles tendinopathy responds best when treated early and correctly. Balance Foot & Ankle in Howell and Bloomfield Hills, Michigan offers comprehensive evaluation including diagnostic ultrasound, MLS laser therapy, shockwave treatment, and custom orthotics for Achilles conditions. Dr. Tom Biernacki DPM specializes in sports-related foot and ankle injuries. Schedule an appointment today.

Medical References & Sources

• American Orthopaedic Foot & Ankle Society — Achilles Tendinopathy
• PubMed Research — Achilles Tendinopathy Treatment