| Feature | Iselin Disease | 5th Metatarsal Avulsion Fracture | Jones Fracture |
|---|---|---|---|
| Age group | 8–15 years (growing child) | Any age; most common adults | Young adults and athletes |
| Onset | Gradual; weeks of activity pain | Acute; specific inversion event | Acute; foot inversion/plantarflexion |
| Trauma required? | No — overuse / traction mechanism | Yes — ankle sprain-type mechanism | Yes — specific mechanism |
| Bruising | None or minimal | Lateral foot bruising within 24 hrs | Lateral foot bruising |
| X-ray finding | Normal apophysis; growth plate PARALLEL to shaft | Fracture line PERPENDICULAR to shaft; Zone 1 | Fracture line; Zone 2–3 (at or distal to tuberosity) |
| Weight-bearing | Painful but possible | Painful; may limp | Very painful to impossible |
| Treatment | Activity modification; supportive shoes; padding; boot if severe | Boot or cast 4–6 weeks; non-weight-bearing | Non-weight-bearing 6–8 weeks; surgical fixation in athletes |
| Prognosis | Excellent — resolves with skeletal maturity | Good with proper immobilization | High non-union risk; careful management needed |
| Iselin Disease Treatment | Indication | Duration | Outcome |
|---|---|---|---|
| Activity modification only | Mild cases; pain ≤4/10; can continue sport with discomfort | 4–8 weeks | 90% resolve within 6–8 weeks |
| Lateral padding + supportive shoe | All cases — prevents direct pressure aggravation | Throughout symptomatic period | Significant comfort improvement |
| Walking boot (2–4 weeks) | Severe pain; unable to participate; multiple sports seasons affected | 2–4 weeks then gradual return | Faster acute resolution; same long-term outcome |
| Ice + NSAIDs | Acute pain management only | 1–2 weeks; not long-term | Symptomatic relief; not curative |
| No treatment / natural history | Mild, non-limiting cases | Resolves with skeletal maturity (within months to 2 years) | 100% long-term resolution |
Quick answer: Iselin Disease is a clinical condition that responds to evidence-based treatment when caught early. Symptoms include pain, swelling, and altered function. Diagnosis requires clinical exam, often imaging. Treatment ladder: conservative care first (4-6 weeks), then targeted interventions if needed. Call (810) 206-1402.
Medically Reviewed | Dr. Tom Biernacki, DPM | Board-Certified Podiatrist | Balance Foot & Ankle, Michigan
The most important clinical decision with Iselin Disease isn’t which treatment to start with — it’s identifying the correct subtype. That changes everything. Call (810) 206-1402.
Iselin Disease: Quick Answer
Medically reviewed by Dr. Tom Biernacki, DPM
Board-certified podiatric surgeon | Balance Foot & Ankle, Howell & Bloomfield Hills, MI
Last reviewed: May 2026
Iselin disease is the underdiagnosed cause of outer foot pain in adolescent athletes – especially soccer players, gymnasts, and basketball players. Often misdiagnosed as ankle sprain, it has specific treatment that prevents complications. We see dozens of these cases yearly at Balance Foot and Ankle.
What Is Iselin Disease?
Iselin disease is traction apophysitis (inflammation of the growth plate) at the base of the 5th metatarsal – the outer side of the foot. Different from Severs disease (heel growth plate apophysitis). Affected age range: 9-14 years old typically; coincides with growth spurts and athletic activity. Self-limiting condition that resolves when growth plate closes (around age 14-16) but causes significant pain during active phase.
Causes
Mechanism: Repetitive pull of the peroneus brevis tendon on the apophysis (growth plate) at the base of the 5th metatarsal causes inflammation. Most common in athletes with: soccer (constant cutting and kicking); basketball (jumping, cutting); gymnastics; dance; running on hard surfaces; football. Risk factors: Sudden activity increase; new sport season; growth spurts (bones grow faster than muscles); tight calves and peroneal muscles.
Symptoms
1. Pain on OUTSIDE of foot (lateral) at the base of 5th metatarsal. 2. Tenderness when pressing directly on the bony prominence at the outside-back of the foot. 3. Pain WORSE with activity (sports, running); BETTER with rest. 4. Mild swelling sometimes present. 5. Visible bony prominence may develop at the base of 5th metatarsal. 6. Limp may be apparent during games or after practice. 7. Often bilateral if both feet are equally stressed.
Diagnosis
Clinical exam: Tenderness directly on the apophysis at base of 5th metatarsal; pain with resisted eversion (turning foot outward against resistance); pain with passive inversion stretch. X-rays: May show widened or fragmented apophysis (growth plate); rule out fractures (especially Jones fracture or 5th metatarsal avulsion fracture). Important to distinguish from Jones fracture or 5th metatarsal avulsion fracture – similar location but different treatment.
Conservative Treatment (Most Cases)
1. Activity modification: Reduce or stop sports temporarily; can usually continue light activities. 2. Ice: 15 minutes 3x daily during flares. 3. NSAIDs: Ibuprofen 400-600mg as needed for pain (with food). 4. Stretching: Daily peroneal and calf stretching. 5. Custom orthotics: Lateral wedge can help shift pressure off 5th metatarsal. 6. Supportive shoes: Avoid worn-out cleats or athletic shoes. 7. Heel cups: Sometimes helpful for combined symptoms. Most cases improve in 6-12 weeks.
When to Modify Sports Activity
Stop sports if: Severe pain limiting normal walking; visible swelling or warmth; pain not improving with rest. Modify (reduce intensity): Pain only after activity; mild discomfort during play. Continue with monitoring: Mild occasional pain; improving with conservative care. Total rest typically not needed – relative rest with activity modification usually sufficient.
Recovery Timeline
Acute symptom improvement: 2-4 weeks with proper conservative care. Return to full sports: 6-12 weeks; sometimes longer if compliance issues. Final resolution: Symptoms self-resolve when growth plate closes (typically age 14-16). Recurrence risk: High during growth spurts or new sport seasons until apophysis closes.
Iselin vs Other Foot Pain in Children
Iselin disease: Outside of foot, base of 5th metatarsal, usually athletes ages 9-14, growth plate inflammation. Severs disease: Heel pain, growth plate of calcaneus, similar age range. Stress fracture: Localized pinpoint pain on bone, may need MRI for diagnosis. Jones fracture: Acute injury at 5th metatarsal base; serious with high nonunion rate. Sinding-Larsen-Johansson: Knee growth plate, similar mechanism but different location.
When to See a Podiatrist
See us if: persistent outer foot pain in young athlete; pain not improving with rest in 2-3 weeks; visible swelling; pain limits sports significantly; uncertain about diagnosis (could be Jones fracture). Early evaluation ensures correct diagnosis and prevents complications. Same-week appointments available for pediatric patients. Schedule online.
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
Long-Term Considerations
After growth plate closes (age 14-16), symptoms resolve completely in most cases. However, some patients may have: Persistent prominent 5th metatarsal base; mild residual tenderness; continued need for supportive shoes during sports. Custom orthotics may be needed long-term in some cases. Most patients return to all sports without lifelong limitations.
Frequently Asked Questions About Iselin Disease
What is Iselin disease?
Inflammation of the growth plate at the base of the 5th metatarsal (outside of foot). Common in adolescent athletes (ages 9-14), especially soccer players, gymnasts, and basketball players.
How long does Iselin disease last?
Acute symptoms improve in 2-4 weeks with proper care. Return to full sports 6-12 weeks. Final resolution when growth plate closes (typically age 14-16).
Can my child play sports with Iselin disease?
Modified activity often acceptable with mild pain. Stop sports temporarily for severe pain or swelling. Custom orthotics and supportive shoes help during athletic activities.
How is Iselin disease different from a fracture?
Iselin: gradual onset, growth plate inflammation in adolescents, conservative treatment. Jones or 5th metatarsal fractures: acute injury, bone breakage, may need walking boot or surgery. Distinguish with X-ray.
Will Iselin disease heal on its own?
Yes – it resolves when growth plate closes (age 14-16). Treatment focuses on managing symptoms and preventing significant time off sports. Most cases improve with conservative care.
What treatment does Iselin disease need?
Conservative: activity modification, ice, NSAIDs, stretching, supportive shoes, sometimes custom orthotics with lateral wedge. Surgery rarely needed.
When should I take my child to a podiatrist for foot pain?
See us if foot pain persists 2-3 weeks despite rest, prevents sports participation, has visible swelling, or you are unsure of diagnosis. Pediatric appointments available same week.
Related Resources from Balance Foot & Ankle
Still Dealing With Iselin Disease?
Same-week appointments at Balance Foot & Ankle in Howell & Bloomfield Hills, MI.
⚠️ 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.
Frequently Asked Questions
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Foot Health & Care Resource Center (American Podiatric Medical Association)
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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.