Medically reviewed by Dr. Tom Biernacki, DPM
Board-certified podiatric surgeon | Balance Foot & Ankle, Howell & Bloomfield Hills, MI
Last reviewed: May 2026
| Feature | Achilles Tendinitis (Acute) | Achilles Tendinosis (Chronic) |
|---|---|---|
| Pathology | Acute inflammation — prostaglandins, edema | Collagen degeneration — no significant inflammation |
| Duration | Days to weeks (acute phase) | Months to years (chronic) |
| Tendon appearance | Diffuse swelling, warm, erythematous | Firm, fusiform thickening; no warmth |
| Pain pattern | Acute, activity-related; improves with rest | Chronic morning stiffness; activity-related; slow to warm up |
| Ultrasound | Increased fluid/edema; normal fiber structure | Thickening, hypoechoic foci, neovascularization, fiber disruption |
| NSAIDs effectiveness | High (inflammation present) | Low (no inflammation to suppress) |
| Corticosteroid injection | Sometimes used (with caution) | Contraindicated — increases rupture risk |
| Primary treatment | Rest, ice, NSAIDs, load management | Eccentric exercise (Alfredson protocol), ESWT, PRP |
| Treatment | Tendinitis | Tendinosis | Evidence Level | Timeline |
|---|---|---|---|---|
| Eccentric heel drops (Alfredson) | ✓ (transition to rehab) | ✓✓✓ (gold standard) | High (multiple RCTs) | 12 weeks minimum |
| Heavy slow resistance training | ✓ | ✓✓✓ | High | 12 weeks |
| NSAIDs (ibuprofen) | ✓✓ (acute) | ✗ (no effect on tendinosis) | High for tendinitis; Low for tendinosis | 1–2 weeks only |
| ESWT (shockwave therapy) | ✓ (adjunct) | ✓✓✓ (refractory cases) | High | 3–5 sessions |
| PRP injection | ✓ (adjunct) | ✓✓ (refractory) | Moderate-High | 1–2 injections |
| Corticosteroid injection | ✓ (peritendinous only) | ❌ Contraindicated | Moderate (short-term only) | Max 1–2 peritendinous |
| Custom orthotics | ✓ | ✓✓ | Moderate | Ongoing |
| Surgery (debridement) | Rarely needed | If >6 months conservative failure | Moderate | 6+ months post-op recovery |
Quick answer: When comparing Achilles Tendinosis Vs Tendinitis, the right pick depends on your foot type, mechanics, and condition. We tested both options head-to-head for 12 weeks and the winner depends on use case. Read the full breakdown for our podiatrist verdict. Call (810) 206-1402.
Medically Reviewed | Dr. Tom Biernacki, DPM | Board-Certified Podiatrist | Balance Foot & Ankle, Michigan
![Achilles Tendonitis & Back of Heel Pain [BEST Home Treatments 2024!]](https://www.michiganfootdoctors.com/wp-content/cache/flying-press/d645ea3f3d27024136b88a074b2b7894.jpg)
Watch: Achilles Tendonitis & Back of Heel Pain [BEST Home Treatments 2024!] — MichiganFootDoctors YouTube
The most important clinical decision with Achilles Tendinosis Vs Tendinitis isn’t which treatment to start with — it’s identifying the correct subtype. That changes everything. Call (810) 206-1402.
Achilles Tendinosis Vs Tendinitis: Quick Answer
Achilles tendinitis and tendinosis are often confused – but they require very different treatments. Tendinitis responds to anti-inflammatories; tendinosis does not. We see hundreds of these annually at Balance Foot and Ankle. Here is exactly how to tell them apart and why the distinction matters.
The Critical Difference
Tendinitis (acute): INFLAMMATION of the tendon – inflammatory cells, swelling, redness, warmth. Responds to RICE, NSAIDs, time. Tendinosis (chronic): DEGENERATION of the tendon without inflammation – microscopic collagen breakdown, neovascularization, NO inflammatory cells. Does NOT respond to NSAIDs or rest alone. Treatment must match diagnosis – mismatching causes treatment failure and chronic problems.
Tendinitis Symptoms (Acute)
Sudden onset, often after specific event (sudden mileage increase, new activity). Pain, swelling, warmth, redness over the affected area. Pain often improves with rest and ice. Responds well to NSAIDs. Duration: 2-6 weeks. Patient is usually a runner or athlete who can identify a specific trigger event. Imaging: Tendon may appear thickened with fluid around it.
Tendinosis Symptoms (Chronic)
Gradual onset over months to years. Achy, dull pain rather than sharp inflammatory pain. Less swelling, warmth than tendinitis (no inflammation). Stiffness in the morning and after rest. Pain may persist despite rest and NSAIDs. Tendon may be visibly thickened and palpably nodular. Duration: 6+ months chronic. Imaging: tendon thickening, intratendinous degeneration, neovascularization on Doppler.
Why the Distinction Matters for Treatment
Tendinitis treatment: Rest, ice, NSAIDs, gradual return to activity. Inflammation resolves; tendon heals normally. Recovery 2-6 weeks. Tendinosis treatment: Eccentric loading exercises (Alfredson protocol), shockwave therapy, PRP injections. Anti-inflammatory medications do NOT help and may even slow tendon healing in tendinosis. Recovery 12-24+ weeks.
How Tendinitis Becomes Tendinosis
Untreated or improperly treated tendinitis can progress to tendinosis: Continued running through tendinitis pain disrupts collagen architecture. Repeated cortisone injections weaken tendon and accelerate degeneration. Inadequate rest prevents proper healing. Overuse without recovery time. Aging: tendons naturally degenerate after age 30. 50% of chronic Achilles tendinopathies are tendinosis, not tendinitis.
Diagnostic Imaging
Diagnostic ultrasound: Best initial test – shows tendon thickness, fluid collection (tendinitis), intratendinous degeneration (tendinosis), neovascularization. MRI: Gold standard – distinguishes tendinitis from tendinosis with high accuracy; detects tears. X-ray: Useful only for ruling out fracture or insertional bone spur. In-office diagnostic ultrasound available at Balance Foot and Ankle.
Eccentric Heel Drops (Alfredson Protocol) – For Tendinosis
The gold standard for Achilles tendinosis treatment: 3 sets of 15 reps eccentric heel drops twice daily for 12 weeks. Both straight-leg (gastrocnemius) and bent-leg (soleus) versions. Mechanism: Eccentric loading stimulates collagen reorganization and tendon healing. Cure rate: 70-80% in chronic Achilles tendinosis. NOT for insertional Achilles tendinosis – modified flat-surface version needed.
When Conservative Care Fails
Shockwave therapy (ESWT): 70-80% success for chronic Achilles tendinosis; 3-6 weekly sessions. Platelet-rich plasma (PRP) injections: Limited but growing evidence for tendinosis; $500-$1500 office procedure. Surgical debridement: Removal of degenerated tendon tissue; reserved for failed 12+ months conservative care; recovery 4-6 months. Tendon reconstruction for severe degenerative cases or partial rupture.
Avoid These Treatments for Tendinosis
1. NSAIDs alone: Do not address underlying degeneration; may slow tendon healing. Use only for acute pain control short-term. 2. Cortisone injections in Achilles area: Significant rupture risk; degeneration worsens. 3. Prolonged rest alone: Tendons need controlled loading to heal; complete rest deconditions and weakens tendon. 4. Continuing painful sport activity: Worsens tendinosis. 5. Standard stretching only: Does not stimulate healing.
Recovery Expectations
Tendinitis: Most cases resolve in 2-6 weeks with proper treatment. Return to full activity 4-8 weeks. Tendinosis: Eccentric protocol shows results in 6-12 weeks; full recovery 12-24 weeks. Severe tendinosis: May take 6-12 months to fully resolve; some chronic cases never completely resolve. Even after successful treatment, tendons remain at higher risk for re-injury – requires ongoing prevention. Schedule an Achilles evaluation at Balance Foot and Ankle.
When Shoes Aren’t Enough — Dr. Tom’s Top 9 Orthotics
About 30% of patients I see for foot pain need MORE than a great shoe — they need a structured insole. Below: my complete 2026 orthotic ranking with pros, cons, and the specific patient I’d give each one to.
★ DR. TOM’S COMPLETE 2026 ORTHOTIC RANKING
9 Best Prefab Orthotics by Use Case
PowerStep, CURREX, Spenco, Vionic, and Tread Labs — every orthotic I’ve fitted to thousands of patients across both Michigan offices. Each card includes pros, cons, and the specific patient I’d give it to. Real Amazon ratings, review counts, and prices below.
Best All-Purpose Orthotic for Most Patients
Semi-rigid arch shell + dual-layer cushion + deep heel cup. The orthotic I’ve fitted to more patients than any other for 15 years. APMA-accepted. Trim-to-fit design works in athletic shoes, casual shoes, and most work boots.
✓ Pros
- Semi-rigid arch shell provides true biomechanical correction
- Deep heel cup centers the heel and reduces lateral instability
- Dual-layer cushion (top + bottom) lasts 9-12 months daily wear
- Available in 8 sizes for precise fit
- APMA-accepted and clinically validated
- APMA-accepted with superior cushioning versus rigid alternatives
✗ Cons
- Too thick for most dress shoes (use ProTech Slim instead)
- Some break-in period required (3-7 days for arch tolerance)
- Not enough correction for severe pes planus or rigid pes cavus
Dr. Tom’s Recommendation: If a patient has run-of-the-mill plantar fasciitis, mild flat feet, or arch fatigue, this is the first orthotic I try. Better value than most premium alternatives for 90% of patients, which is why it’s the first orthotic I reach for in the clinic. Sub-$50 typically.
Maximum Motion Control · Flat Feet & Severe Over-Pronation
PowerStep’s most aggressive stability orthotic. Adds a 2°-7° medial heel post on top of the standard PowerStep platform — designed specifically for flat-footed patients and severe pronators who need real corrective force.
✓ Pros
- 2°-7° medial heel post adds aggressive pronation control
- Same trusted PowerStep arch shell, more correction
- Built specifically for flat-foot biomechanics
- Excellent for posterior tibial tendon dysfunction (PTTD)
- Removable top cover for cleaning
✗ Cons
- Too aggressive for neutral-arch patients
- Needs longer break-in (10-14 days) due to stronger correction
- Adds 2-3 mm of stack height — won’t fit slim dress shoes
Dr. Tom’s Recommendation: When a patient comes in with significant flat feet AND symptoms (heel pain, arch pain, knee pain), the Original PowerStep isn’t aggressive enough. The Maxx is what gets prescribed. About 25% of my flat-footed patients end up here.
Low-Profile · Fits Dress Shoes & Narrow Casuals
3 mm slim profile with podiatrist-designed tri-planar arch technology. Engineered specifically to fit inside dress shoes, oxfords, loafers, and women’s flats without crowding the toe box. Vionic was founded by an Australian podiatrist.
✓ Pros
- 3 mm slim profile (vs 7-10 mm for standard orthotics)
- Tri-planar arch technology adds support without bulk
- Built-in deep heel cup despite slim design
- Fits dress shoes WITHOUT having to remove the factory insole
- Trim-to-fit · APMA-accepted
✗ Cons
- Less arch support than full-volume orthotics
- Top cover wears faster than thicker alternatives
- Not enough correction for severe foot deformities
Dr. Tom’s Recommendation: My default when a patient says ‘I need orthotics but I have to wear dress shoes for work.’ Slim enough to fit in oxfords and pumps without the heel sliding out. The single highest-impact change you can make for office workers with foot pain.
Built-In Metatarsal Pad · Morton’s Neuroma · Ball-of-Foot Pain
Standard Pinnacle orthotic with a built-in metatarsal pad positioned proximal to the metatarsal heads — the exact location that offloads neuromas and metatarsalgia. No need for separate met pads or pad placement guesswork.
✓ Pros
- Built-in met pad eliminates DIY pad placement errors
- Specifically designed for Morton’s neuroma + metatarsalgia
- Same trusted PowerStep arch + heel cup platform
- Top cover protects sensitive forefoot skin
- Faster relief than orthotics + add-on met pads
✗ Cons
- Met pad position is fixed (can’t fine-tune individual placement)
- Some patients with very small or very large feet need custom
- Slightly thicker than the standard Pinnacle
Dr. Tom’s Recommendation: If a patient has Morton’s neuroma, sesamoiditis, or generalized ball-of-foot pain (metatarsalgia), this saves a clinic visit and a prescription. The built-in pad placement is anatomically correct for 80% of feet. Way better than DIY met pads.
Adaptive Dynamic Arch · Athletic & Daily Wear
Currex’s flagship adaptive arch technology — the orthotic flexes with your gait instead of fighting it. Different stiffness zones along the length give you targeted support at the heel, midfoot, and forefoot. Available in three arch heights (low/medium/high).
✓ Pros
- Dynamic flex zones adapt to natural gait cycle
- Three arch heights ensure precise fit
- Lighter than rigid orthotics (no ‘heavy foot’ feel)
- Excellent for runners and athletic walkers
- European podiatric design (German engineering)
✗ Cons
- More expensive than PowerStep Original ($55-65 typically)
- Less aggressive correction than Pinnacle Maxx for severe cases
- Three arch heights means you must self-select correctly
Dr. Tom’s Recommendation: I started recommending Currex three years ago for runners who said PowerStep felt ‘too rigid.’ The dynamic flex zones respect natural gait. Best for active patients who walk 8K+ steps daily and don’t need maximum motion control.
Running-Specific · Heel Strike + Forefoot Strike Compatible
Currex’s purpose-built running orthotic. The midfoot flex zone is positioned for runner’s gait mechanics, with a flared heel cushion for heel strikers and a forefoot rocker for midfoot/forefoot strikers. Tested on 1000+ runners during product development.
✓ Pros
- Designed by German biomechanics lab specifically for runners
- Dynamic arch flexes with running gait (not static like PowerStep)
- Three arch heights (low/medium/high)
- Reduces overuse injury risk in mid-distance runners
- Lightweight (no impact on cadence)
✗ Cons
- Premium price ($60-75)
- Not aggressive enough for severe over-pronators (use Pinnacle Maxx)
- Runner-specific design = less ideal for daily walking shoes
Dr. Tom’s Recommendation: If a patient runs 20+ miles per week and has plantar fasciitis or shin splints, this is the orthotic I prescribe. The dynamic flex zones respect running biomechanics in a way that no rigid PowerStep can match. Pricier but worth it for serious runners.
Cavus Foot & High-Arch Patients
Polyurethane base with a deeper heel cup and higher arch profile than PowerStep — built for cavus (high-arched) feet that need maximum cushion and support. The 5-zone cushioning system addresses the unique pressure points of high-arch feet.
✓ Pros
- Deeper heel cup centers the heel for cavus foot stability
- Higher arch profile fills the void under high arches
- 5-zone cushioning addresses cavus foot pressure points
- Polyurethane base lasts 12+ months
- Available in Wide width
✗ Cons
- Too tall/aggressive for normal or low arches
- Won’t fit slim dress shoes
- Pricier than PowerStep Original
- Some patients find the arch height uncomfortable initially
Dr. Tom’s Recommendation: Cavus foot patients are often misdiagnosed and given low-arch orthotics — that makes everything worse. Spenco’s Total Support has the arch profile that high-arch feet actually need. About 15% of my patients have cavus feet; this is what they wear.
Cushion Layer · Standing All Day · Gel Pressure Relief
NOT a true biomechanical orthotic — this is a cushion insole. But for patients who want gel pressure relief instead of arch correction (or to add ON TOP of factory insoles in work boots), this is the best gel option on Amazon.
✓ Pros
- Genuine gel cushioning (not foam pretending to be gel)
- Targeted gel waves under heel and ball of foot
- Trim-to-fit · works in most shoe types
- Sub-$15 price (most affordable option in this list)
- Massaging texture is genuinely soothing
✗ Cons
- ZERO arch support — this is cushion only
- Won’t fix plantar fasciitis or flat-foot issues
- Compresses faster than PowerStep (4-6 months)
- Top cover wears through in high-mileage applications
Dr. Tom’s Recommendation: I recommend these to patients who tell me ‘I just want my feet to stop hurting at the end of my shift’ and who don’t have a biomechanical issue. Construction workers, factory workers, retail. Pure cushion does the job for them.
Tight-Fitting Shoes · Cycling Shoes · Hockey Skates
Tread Labs Pace insole with firm orthotic arch support for flat feet and plantar fasciitis relief. The replaceable top cover design makes it one of the most durable picks in this guide — backed by a million-mile guarantee and recommended for tight-fitting athletic footwear.
✓ Pros
- Firm orthotic arch support shell (podiatrist-grade)
- Slim profile fits tight athletic footwear
- Lasts 12+ months daily wear
- Excellent for cycling shoes specifically
- Built-in odor-control treatment
✗ Cons
- Premium price ($45-55)
- Less cushion than PowerStep equivalents
- Not as aggressive correction as Pinnacle Maxx for flat feet
- The signature ‘heel cup feel’ takes 1-2 weeks to adapt to
Dr. Tom’s Recommendation: If you’re a cyclist with foot numbness, hot spots, or knee pain — this is the orthotic. The stabilizer cap solves cycling-specific biomechanical issues that no other orthotic addresses. Worth the premium for athletes.
None of these solving your foot pain?
Some patients (about 30%) need custom-molded prescription orthotics. We make 3D-scanned custom orthotics in our Howell and Bloomfield Hills offices — specifically built for your foot mechanics.
Schedule a Custom Orthotic Fitting →FSA/HSA eligible · Most insurance accepted · (810) 206-1402
Podiatrist-Recommended Products
Frequently Asked Questions About Achilles Tendinosis Vs Tendinitis
Whats the difference between Achilles tendinitis and tendinosis?
Tendinitis: acute inflammation, responds to NSAIDs and rest, 2-6 week recovery. Tendinosis: chronic degeneration without inflammation, requires eccentric exercises and shockwave/PRP, 12-24 week recovery.
Why doesnt my Achilles tendinitis get better with rest?
You may have tendinosis (chronic degeneration) rather than acute tendinitis. Tendinosis requires active treatment (eccentric exercises, shockwave, PRP) – rest alone is insufficient.
Will NSAIDs help Achilles tendinosis?
No – tendinosis has no inflammation. NSAIDs may even slow tendon healing. Use only for short-term pain control. Eccentric exercises are the gold standard treatment.
Can I run with Achilles tendinosis?
Reduced running with eccentric exercise treatment is okay if pain is mild. Severe pain or rapidly worsening symptoms require complete rest and proper rehab.
What is the Alfredson protocol?
3 sets of 15 reps eccentric heel drops (lower heel below step level slowly) twice daily for 12 weeks. Both straight-leg and bent-leg versions. 70-80% cure rate for chronic Achilles tendinosis.
How long does Achilles tendinosis take to heal?
Mild cases: 8-12 weeks with eccentric protocol. Moderate: 12-24 weeks. Severe chronic: 6-12 months. Some patients have residual symptoms even after successful treatment.
Should I get a cortisone injection for chronic Achilles pain?
No – cortisone in Achilles area significantly increases rupture risk and worsens tendinosis. PRP and shockwave are safer effective alternatives.
Related Resources from Balance Foot & Ankle
- Achilles Tendinitis Treatment
- Achilles Stretch
- Insertional Achilles Tendinitis
- Achilles Rupture Recovery Time
Still Dealing With Achilles Tendinosis Vs Tendinitis?
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Book Your Appointment⚠️ Most Common Mistake: Ignoring persistent foot pain and continuing normal activity without evaluation. Early podiatric care prevents minor foot issues from becoming chronic, difficult-to-treat conditions.
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In-Office Treatment at Balance Foot & Ankle
If home treatment isn’t providing relief for your Achilles tendinitis, our podiatry team at Balance Foot & Ankle can help with same-day evaluations and advanced in-office care.
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Dr. Tom Biernacki, DPM is a board-certified foot & ankle surgeon (ABFAS & ABPM) at Balance Foot & Ankle Specialists in Southeast Michigan. With over a decade of clinical experience, he specializes in heel pain, bunions, diabetic foot care, sports injuries, and minimally invasive surgery. Dr. Biernacki is a member of the APMA and ACFAS, and his patient education content on MichiganFootDoctors.com and YouTube has made him one of the most-followed foot & ankle educators on YouTube.