Achilles tendinopathy—often called Achilles tendonitis—is a load-related condition involving pain and reduced function in the tendon connecting the gastrocnemius and soleus muscles to the heel.
The term "tendinopathy" is generally more useful than "tendonitis" because persistent Achilles pain does not always represent a simple inflammatory process. The tendon may also demonstrate changes in load tolerance, structure, mechanical capacity, and pain sensitivity.
Iontophoresis may be considered when a qualified healthcare professional identifies a localized, accessible treatment target and a prescriber orders an appropriate ionized medication. Its most evidence-supported role is as a symptom-modifying adjunct in recent-onset midportion Achilles tendinopathy. It should not replace progressive tendon loading, patient education, or a graded return to activity.
Clinical notice: Medication selection, concentration, polarity, dose, electrode placement, treatment frequency and activity instructions require an appropriate prescription, professional judgment and compliance with the instructions supplied with the medication, patch, electrode and dose controller.
Quick Answer: Where Does Iontophoresis Fit?
| Clinical question | Practical answer |
|---|---|
| Is iontophoresis appropriate for every painful Achilles tendon? | No. The clinician must first distinguish tendinopathy from rupture, bursitis, paratenon involvement, referred pain, and other posterior-ankle conditions. |
| Which Achilles presentation has the strongest support? | Acute or recent-onset midportion Achilles tendinopathy with a localized, superficial treatment target. |
| Is the evidence the same for insertional tendinopathy? | No. Insertional Achilles pain has different compression and loading considerations, and evidence for iontophoresis is less certain. |
| Where is the medication electrode placed? | Over the professionally identified focal treatment target, not automatically at the heel or directly over a bony prominence. |
| What is the foundation of rehabilitation? | Education, load management, and progressive tendon-loading exercise. |
| How should success be measured? | By function, tendon-loading capacity, calf strength, activity tolerance, and skin response—not pain relief alone. |
Midportion vs. Insertional Achilles Tendinopathy
Identifying the symptom location is essential because the two primary presentations may require different electrode placement and exercise modifications.
| Feature | Midportion Achilles tendinopathy | Insertional Achilles tendinopathy |
|---|---|---|
| Typical symptom location | Usually more than 2 cm above the tendon’s attachment to the heel, commonly within the 2–6 cm midportion region | At or immediately adjacent to the tendon’s attachment on the calcaneus |
| Palpation finding | Focal mid-tendon tenderness, with or without thickening | Tenderness at the distal tendon-to-bone junction |
| Common loading complaint | Running, jumping, accelerating, hills and repeated calf raises | Uphill walking, stairs, shoes pressing on the heel and deep ankle dorsiflexion |
| Compression issue | Less direct compression against the calcaneus | Tendon may be compressed against the calcaneus during deeper dorsiflexion |
| Early exercise consideration | Loading may progress through a greater range as tolerated | Initially limit provocative end-range dorsiflexion and avoid unsupported heel drops below a step |
| Iontophoresis evidence | Supported most clearly for acute midportion symptoms | Less certain; insertional studies are more limited and observational |
The 2024 clinical practice guideline focuses specifically on midportion Achilles tendinopathy. It describes diagnosis using gradual-onset pain in the tendon midportion, pain during tendon-loading activity, localized palpation findings, and tests such as the painful arc sign and Royal London Hospital test. Its recommendations should not automatically be transferred to insertional tendon pain.
Before Treatment: Rule Out Achilles Tendon Rupture
A routine tendinopathy protocol is inappropriate when the patient may have a partial or complete tendon rupture.
Findings that increase concern for rupture
- Sudden posterior ankle or calf pain during running, jumping or forceful push-off
- A reported pop, snap or sensation of being struck in the back of the leg
- New difficulty walking or pushing off
- Marked plantar-flexion weakness
- Bruising or swelling
- A palpable tendon gap
- Absent or reduced plantar flexion during the Thompson calf-squeeze test
- Altered resting ankle position during the Matles test
The ability to move the ankle does not exclude an Achilles tear. Partial tears may also produce a normal or inconclusive calf-squeeze response. Suspected rupture requires prompt medical evaluation rather than iontophoresis or routine loading exercise.
Other Conditions That May Resemble Achilles Tendinopathy
| Alternative condition | Distinguishing consideration |
|---|---|
| Retrocalcaneal bursitis | Deep pain between the Achilles tendon and calcaneus, often aggravated by dorsiflexion or shoe pressure |
| Superficial calcaneal bursitis | More superficial irritation between the skin and heel counter |
| Achilles paratenon involvement | Pain, swelling or crepitus surrounding the tendon rather than a focal intratendinous site |
| Plantaris-related pain | Medial-sided symptoms that may not follow the usual Achilles pattern |
| Posterior ankle impingement | Pain concentrated deeper in the posterior ankle, often with plantar flexion |
| Sural nerve irritation | Burning, tingling or altered sensation along the posterolateral ankle or foot |
| Referred lumbar or neurological pain | Symptoms influenced by spinal movement or accompanied by neurological findings |
| Calcaneal stress injury | Bone-focused pain, impact intolerance or symptoms inconsistent with isolated tendon loading |
| Systemic or inflammatory enthesitis | Bilateral symptoms, prolonged stiffness or additional joint and systemic findings |
| Infection or inflammatory flare | Unusual warmth, redness, systemic illness or rapidly increasing symptoms |
Insertional pain should also be distinguished from retrocalcaneal and superficial calcaneal bursitis because these conditions may require different placement, footwear, and loading decisions.
Achilles Tendinopathy Examination Checklist
1. Document the history
Record:
- Exact symptom location
- Gradual versus sudden onset
- Duration and recent changes
- Running, walking, work and sport volume
- Changes in speed, hills, jumping or surface
- Morning stiffness
- Pain at the beginning, during and after activity
- Response during the following 24 hours
- Footwear changes
- Previous tendon injury or rupture
- Medication use and allergies
- Recent fluoroquinolone or systemic corticosteroid exposure
- Relevant metabolic, vascular, inflammatory or neurological conditions
- Patient goals and required activity level
2. Observe gait and functional movement
Look for:
- Reduced push-off
- Shortened stride
- Avoidance of the involved side
- Early heel rise
- Altered stair strategy
- Difficulty accelerating or changing direction
- Footwear pressure over the symptomatic region
3. Inspect the tendon and surrounding tissue
Compare sides for:
- Swelling
- Thickening
- Redness or warmth
- Bruising
- Skin irritation
- Scars
- Heel-counter pressure
- Visible deformity or tendon discontinuity
4. Palpate systematically
Identify:
- The point of maximal tenderness
- Distance from the calcaneal insertion
- Midportion versus insertional symptoms
- Tendon thickening or nodularity
- Retrocalcaneal tenderness
- Paratenon tenderness or crepitus
- Calf-muscle tenderness
- Skin sensation and integrity at proposed electrode sites
The medication electrode should target the clinically identified structure—not the general area where the patient gestures.
5. Assess motion
Measure ankle dorsiflexion and plantar flexion with the knee both flexed and extended when relevant. This helps distinguish gastrocnemius-related limitations from restrictions involving the deeper soleus complex.
Avoid forcing painful end-range dorsiflexion in a highly irritable insertional presentation.
6. Measure calf strength and endurance
Depending on irritability, assess the following:
- Bilateral heel raise
- Single-leg heel raise
- Heel-raise height
- Number of controlled repetitions
- Knee-straight calf capacity
- Knee-bent soleus-dominant capacity
- Isometric plantar-flexion force
- Quality and speed of movement
A patient may report less pain while still having substantial deficits in calf strength, endurance, or power.
7. Assess energy-storage capacity when appropriate
Later-stage testing may include:
- Pogo hops
- Single-leg hopping
- Repeated jumping
- Running drills
- Acceleration and deceleration
- Sport-specific reactive tasks
These activities are inappropriate during rupture screening or when basic walking and calf loading remain poorly tolerated.
8. Establish baseline outcomes
Useful measures include:
- VISA-A
- Lower Extremity Functional Scale
- Patient-Specific Functional Scale
- Pain during a standardized loading task
- Morning stiffness duration
- Single-leg heel-raise repetitions and height
- Walking or running tolerance
- Sport- or work-specific capacity
The 2024 guideline identifies the VISA-A and functional testing among the principal tools for monitoring midportion Achilles tendinopathy.
What Does the Evidence Say About Iontophoresis?
Evidence should be interpreted according to symptom duration and tendon location.
| Evidence | What it means clinically |
|---|---|
| 2024 midportion Achilles guideline | Education and tendon-loading exercise are first-line treatments. Passive treatments may be used as adjuncts rather than stand-alone care. |
| Acute Achilles randomized trial | A small double-blind trial compared dexamethasone iontophoresis with saline iontophoresis in 25 patients whose symptoms had been present for less than three months. Positive effects favored dexamethasone, but the small sample limits certainty. |
| Acute midportion recommendation | Current guideline material supports dexamethasone iontophoresis to reduce pain and improve function in appropriate acute midportion cases. |
| Insertional Achilles evidence | A 2025 retrospective study evaluated 159 patients with insertional tendinopathy or retrocalcaneal bursitis, but observational evidence does not provide the same certainty as a randomized trial. |
| Practical conclusion | Consider iontophoresis as a targeted symptom-modifying adjunct, while progressive loading remains the central rehabilitation intervention. |
The available randomized evidence involves acute Achilles tendon pain, not every form of persistent or insertional tendinopathy. A more recent insertional study describes varying effects and cannot establish that additional iontophoresis treatments caused better outcomes.
When Iontophoresis May Be a Reasonable Adjunct
Iontophoresis may fit the plan when:
- Symptoms are localized and relatively superficial
- The presentation is compatible with acute midportion tendinopathy
- Rupture and serious pathology have been excluded
- A prescriber has ordered a suitable ionized medication
- Pain is limiting participation in calf loading or functional activity
- The skin is intact
- An electrode or patch can maintain complete contact
- The patient can avoid shoe, sock or brace pressure over the application
It is less likely to be useful when:
- Pain is diffuse or poorly localized
- The presentation is primarily chronic with no clear symptom-modification goal
- A rupture is suspected
- Pain is caused primarily by footwear pressure or a bony prominence
- The target is too deep for reliable surface localization
- Skin condition or sensation makes treatment unsafe
- The patch cannot remain secure during walking or daily activity
- The patient expects passive treatment to replace loading rehabilitation
Step-by-Step Achilles Iontophoresis Protocol
Step 1: Identify the Achilles subtype
Document whether the target is:
- Midportion tendon
- Distal insertion
- Retrocalcaneal region
- Superficial heel region
- Paratenon or another posterior-ankle structure
Do not use “Achilles tendonitis” as the sole justification for treatment.
Step 2: Define the treatment objective
A useful objective connects symptom modification to function.
Examples:
- Improve tolerance for introductory calf-loading exercise
- Reduce pain that prevents normal walking
- Improve tolerance for work footwear
- Support progression from strength work to running
- Reduce a focal symptom barrier during an active rehabilitation program
Step 3: Verify the medication order
Confirm:
- Medication
- Concentration
- Polarity
- Prescribed dose
- Treatment frequency
- Medication allergies
- Product compatibility
- Patient-specific precautions
Medication is not included with Balego iontophoresis patches, controllers, or electrode kits.
For general dose calculations and medication polarity, refer to our Iontophoresis Frequently Asked Questions rather than reproducing the full information on this condition-specific page.
Step 4: Inspect and prepare the skin
Inspect the treatment and return sites for:
- Cuts
- Blisters
- Abrasions
- Rash
- Irritated follicles
- Recent shaving
- Altered sensation
- Excessive swelling
- Previous electrode reactions
Follow the exact skin-preparation and electrode-filling directions for the selected product. Our Iontophoresis Electrode Directions for Use provides the complete preparation, polarity, and dose-limit instructions.
Step 5: Position the medication electrode
Midportion placement
Place the active drug-delivery electrode over the focal mid-tendon target identified during examination.
Confirm that:
- The drug matrix covers the tender region
- The adhesive does not wrinkle around the narrow tendon contour
- The electrode is not folded
- The application does not enter a deep skin crease
- A shoe or sock will not compress its edge
Insertional placement
Insertional placement requires additional caution because the target lies close to the calcaneus and may be exposed to shoe pressure.
Consider:
- Whether tenderness is truly in the tendon or in a nearby bursa
- Whether the electrode can maintain full contact
- Whether the drug matrix can be positioned without excessive pressure over bone
- Whether the patient can use open-backed or noncompressive footwear
- Whether the clinical rationale is sufficient given the more limited evidence
Do not place a patch over the heel simply because the patient reports “Achilles pain.”
Step 6: Position the return electrode
With a controller-based system, place the return electrode proximally over intact soft tissue, commonly over an appropriate portion of the calf, according to the product instructions.
Ensure:
- Complete contact
- Adequate separation
- No pressure from clothing
- No contact with jewelry
- No placement over compromised skin
- No tape, wrap or brace compressing the electrode
Step 7: Select the delivery system
Choose between controller-based electrodes and a self-contained patch according to the following:
- Target contour
- Prescribed dose
- Medication polarity
- Desired monitoring
- Patient schedule
- Skin sensitivity
- Footwear
- Activity during treatment
Step 8: Deliver the prescribed dose
The existing source protocol describes a 40 mA-min treatment. This should not be presented as mandatory for every Achilles application.
With the ActivaDose II Iontophoresis Dose Controller, the clinician selects the prescribed dose and current, and the device calculates the required treatment time. The appropriate setting still depends on the prescription, medication, polarity, electrode limits, skin condition, and patient tolerance.
For the electrode line described in the directions:
- Negative-polarity treatment must not exceed the listed negative-polarity dose and current limits
- Positive-polarity treatment has a lower listed maximum dose
- The patient should report pain immediately
- Treatment should be paused if contact is disrupted or unusual discomfort occurs
Always follow the exact instructions for the product being used.
Step 9: Prevent movement and compression
During controller-based treatment:
- Keep the ankle comfortably supported
- Avoid repeated plantar flexion and dorsiflexion
- Prevent lead-wire tension
- Do not let clothing compress either electrode
- Do not place a cold pack, wrap or brace over the electrodes
- Do not allow the patient to rest the electrode against a table or chair
For wearable patches:
- Check the patch during walking before the patient leaves
- Avoid footwear that rubs the patch
- Avoid tight socks or compression garments over it
- Avoid exercise that causes the patch to lift or become heavily saturated with perspiration
- Provide a clear removal time and skin-reaction instructions
Step 10: Reassess after treatment
Record:
- Delivered dose
- Medication and concentration
- Polarity
- Patch or electrode model
- Active and return placement
- Treatment time
- Patient sensation
- Skin response
- Change in the selected loading task
- Instructions provided
Temporary redness can occur with direct-current treatment. Burning, blistering, severe itching, increasing pain, or an unusual rash requires treatment cessation and appropriate follow-up.
Comparing Balego Iontophoresis Options for the Achilles Region
This comparison focuses only on Achilles-specific fit. Full dose, size, and wear-time specifications remain on the linked product pages.
| Product approach | Achilles-specific advantage | Important limitation | Best workflow fit |
|---|---|---|---|
| ActivaDose II with Trivarion Butterfly electrodes | A butterfly electrode is specifically suited to curved or narrow anatomical regions such as the Achilles tendon | Requires a controller, lead wires and supervised positioning | Clinics prioritizing contour, adjustable current and direct monitoring |
| ActivaDose II with Ionto4 Butterfly electrodes | Provides a contoured alternative to a square drug electrode with a different reservoir and footprint | Fit must still be checked around the narrow tendon and heel | Clinics already standardized on Ionto4 disposable kits |
| IontoPATCH wearable patches | No external lead wires; may support clinician-directed wear outside the treatment room | Shoes, socks, perspiration and ankle movement may loosen or compress the patch | Patients who can protect the posterior ankle site during the prescribed wear period |
| ACTIVApatch wearable patches | Self-contained, no-saline models provide multiple treatment-time options | Faster delivery does not solve poor adhesion or footwear pressure | Clinics seeking a simplified wearable workflow with several scheduling options |
| Balego iontophoresis collection | Allows comparison across wired systems, wearable patches and disposable electrode shapes | Product choice must follow the medication order and treatment-site requirements | Clinics evaluating more than one iontophoresis workflow |
Trivarion’s form-fitting design and Butterfly option are specifically described for curved regions, including the Achilles tendon. Ionto4 also offers a butterfly electrode for contoured placement. Wearable systems remove external wires but require realistic planning around footwear, ankle movement, and adhesion.
Progressive Achilles Rehabilitation
Iontophoresis may reduce a symptom barrier, but it does not restore tendon capacity by itself.
Stage 1: Establish tolerable loading
Possible interventions include:
- Isometric plantar-flexion loading
- Supported bilateral heel raises
- Reduced-range heel raises
- Seated calf loading
- Temporary reduction of high-speed or high-impact activity
- Modification of provocative hills, sprinting or jumping
Complete rest is generally not the long-term goal. Loading is adjusted to a level the tendon can tolerate and recover from.
Stage 2: Restore calf strength
Progress according to the response using:
- Standing heel raises
- Seated or knee-bent heel raises
- Single-leg heel raises
- External resistance
- Slow concentric and eccentric loading
- Increased range when appropriate
Include both knee-straight and knee-bent work so the program addresses gastrocnemius and soleus capacity.
Our resistance bands may be useful for supplemental ankle and lower-extremity strengthening when elastic resistance matches the rehabilitation plan.
Stage 3: Restore tendon energy storage
When foundational strength and walking tolerance are adequate, progress toward the following is possible:
- Pogo hops
- Skipping
- Bilateral and single-leg jumping
- Faster calf raises
- Running drills
- Acceleration and deceleration
- Changes of direction
Symptoms should be assessed during loading and again over the following day.
Stage 4: Return to running, work or sport
Progress:
- Total volume
- Speed
- Hills
- Consecutive activity days
- Jumping volume
- Sport-specific reactive demand
Do not use pain at rest as the only return criterion. Compare calf strength, heel-raise performance, hopping tolerance, and activity-specific capacity.
How Insertional Rehabilitation Differs
Insertional Achilles symptoms are frequently aggravated by compression between the tendon and calcaneus.
During the more irritable stage:
- Perform heel raises from the floor rather than dropping below a step
- Avoid prolonged deep dorsiflexion when it reproduces insertional pain
- Review heel-counter pressure
- Modify uphill walking or running
- Progress range gradually as symptoms permit
- Distinguish tendon pain from retrocalcaneal bursitis
A temporary clinician-directed heel lift may reduce ankle dorsiflexion during activity for selected patients. We carry heel lifts, wedges, and inserts, including the Clearly Adjustable Heel Lift and Balego Adjustable Heel Lift. A lift should be treated as a temporary load-management tool rather than a replacement for progressive rehabilitation. The 2024 midportion guideline notes that heel lifts may be used temporarily to reduce ankle range during activity.
Reassessment: What Improvement Should Look Like
Symptoms
- Reduced morning stiffness
- Reduced focal tenderness
- Lower pain during a standardized loading task
- Less next-day symptom escalation
- Improved tolerance for footwear
Capacity
- Increased heel-raise repetitions
- Improved heel-raise height
- Better knee-bent calf strength
- Increased walking or running volume
- Improved hopping or jumping tolerance
- Better confidence during push-off
Function
- Improved stair climbing
- Increased work tolerance
- Improved running pace or distance
- Greater tolerance for hills
- Return to dance, court sport or field activity
- Improved VISA-A, LEFS, or patient-specific score
Reasons to reconsider the plan
- No meaningful functional improvement
- Increasing weakness
- New bruising or swelling
- A sudden change in symptoms
- Positive or inconclusive rupture findings
- Worsening neurological symptoms
- Repeated skin irritation
- Inability to keep the patch or electrode secure
- Symptoms no longer localize to the original target
- Continued reliance on passive care without loading progression
Documentation Template
Clinical classification: Midportion/insertional Achilles tendinopathy with symptoms located __________.
Rupture screening: Thompson test __________; resting ankle position __________; palpable defect __________.
Functional limitation: Symptoms limit __________.
Baseline loading measure: __________ heel raises at __________ height/resistance; pain __________.
Iontophoresis objective: Reduce localized symptoms that interfere with __________.
Medication order: Medication __________; concentration __________; polarity __________.
Delivery system: Controller/patch __________; electrode or patch size __________.
Placement: Drug electrode __________; return electrode __________.
Treatment: Dose __________ mA-min, current __________ mA, and time ___________.
Skin response: __________.
Immediate functional response: __________.
Loading plan: __________.
Follow-up measure: Reassess __________ on __________.
For billing-oriented documentation, refer to our Iontophoresis Reimbursement Codes and Documentation Guide.
Frequently Asked Questions
Can iontophoresis help Achilles tendinopathy?
It may help reduce pain and improve function in selected patients, particularly those with acute midportion Achilles symptoms. It should be combined with education and progressive tendon loading rather than used as a stand-alone treatment.
Is Achilles tendonitis the same as Achilles tendinopathy?
The terms are commonly used interchangeably in searches and everyday conversation. Tendinopathy is the broader clinical term and does not assume that persistent symptoms are caused only by active inflammation.
Where is the medication electrode placed?
The medication electrode is placed over the focal target identified during examination. For midportion tendinopathy, this is typically above the heel insertion. For insertional pain, placement must account for the calcaneus, nearby bursae, electrode contact, and footwear pressure.
Should the patch be placed directly over the most painful spot?
Usually, the focal treatment target guides placement, but the clinician must also consider skin integrity, bony prominence, electrode contour, and the actual structure producing symptoms.
Can iontophoresis treat an Achilles rupture?
No. Iontophoresis does not reconnect or repair a torn tendon. A suspected rupture requires prompt medical evaluation.
Is dexamethasone included with the patch or electrode?
No. Medication is supplied separately. The medication, concentration, polarity, and dose must be prescribed and professionally directed.
Is 40 mA-min always the correct dose?
No. Although 40 mA-min appears in many controller-based protocols, the correct dose depends on the prescription, medication polarity, device, electrode limits, skin condition, and patient response.
Can a patient walk while wearing an Achilles iontophoresis patch?
A wearable patch may permit mobility when directed, but walking must not loosen, fold, or compress the patch. Shoe counters, socks, braces, perspiration, and repeated ankle motion can interfere with adhesion.
Should Achilles heel drops always be performed below a step?
No. Deep dorsiflexion can aggravate insertional Achilles symptoms by increasing compression near the heel. Patients with insertional pain may initially perform heel raises from a level surface.
How many iontophoresis treatments are needed?
There is no universal number. Establish a defined treatment trial and reassess function, tendon-loading capacity, symptoms, and skin response. Do not continue automatically when the patient is not making meaningful progress.
Clinical Takeaway
The central decision in an Achilles iontophoresis protocol is not which patch to use. It is determining what structure is painful, whether the symptoms are midportion or insertional, whether rupture has been excluded, and what active rehabilitation goal the modality is meant to support.
For a selected patient with acute, localized midportion Achilles tendinopathy, clinician-directed dexamethasone iontophoresis may help reduce a symptom barrier. Long-term recovery, however, depends on restoring calf strength, tendon-loading capacity, and tolerance for the demands of walking, work, running, or sport.
Explore our iontophoresis patches, electrodes, and dose controllers or browse additional iontophoresis evaluation and treatment protocols.
