Iselin's Disease – 5th Metatarsal Pain in Young Athletes
Iselin's disease causes pain on the outside of the foot in young athletes. Learn about symptoms, diagnosis, and how conservative treatment returns you to sport.
By Dr. Carli Hoover, DPM
Iselin's Disease – 5th Metatarsal Pain in Young Athletes
Are you a young athlete experiencing pain on the outside of your foot? Iselin's disease might be the reason you're sidelined from your sport. This condition, which affects the fifth metatarsal bone, is increasingly common in active adolescents. At Central Florida Foot & Ankle Institute, we understand the challenges young athletes face when foot pain interrupts training and competition. Let's explore what Iselin's disease is and how we can get you back in the game.
What Is Iselin's Disease?
Iselin's disease is an overuse injury affecting the apophysis (growth plate) of the fifth metatarsal bone—the long bone on the outside of your foot. Also called fifth metatarsal apophysitis, this condition occurs almost exclusively in young athletes aged 10-15, particularly during periods of rapid growth. The condition causes pain and inflammation where the peroneus brevis muscle tendon attaches to the fifth metatarsal, creating a painful bump on the outside of the foot.
Unlike Freiberg's infraction, Iselin's disease doesn't involve bone death. Instead, it's an inflammation of the growth plate caused by repeated stress and pulling from the attached muscle and tendon.
Understanding the Causes
The Growth Plate Connection
During adolescence, growth plates are the last areas of your bones to harden and mature. This makes them particularly vulnerable to stress and injury. The fifth metatarsal apophysis is especially susceptible because of the significant forces it experiences during running, jumping, and lateral (side-to-side) movements.
Repetitive Stress and Overuse
Iselin's disease develops from repetitive stress to the fifth metatarsal. Sports that place heavy demands on this area are common culprits:
- Soccer – with its frequent direction changes and lateral movements
- Basketball – demanding quick cuts and pivoting
- Gymnastics – requiring powerful toe-off movements
- Track and field – especially sprinting and jumping events
- Volleyball – with its explosive lateral movements
Training Errors
Many young athletes develop Iselin's disease when they:
- Suddenly increase training intensity or volume
- Don't take adequate rest between training sessions
- Don't properly warm up before competition
- Use improper technique during sport-specific movements
- Haven't developed sufficient conditioning
Biomechanical Factors
Certain foot structures increase vulnerability. If you have:
- High-arched feet (cavus foot)
- Ankle instability
- Tight calf muscles
- Inversion ankle sprains in your history The AAOS sprained-ankle page explains why that history matters: once the outer ligaments have been stretched, the ankle is more likely to roll inward again and keep loading the fifth-metatarsal attachment.
You may be at higher risk for developing Iselin's disease.
Recognizing the Symptoms
Where the Pain Occurs
The classic presentation of Iselin's disease is pain and tenderness on the outside of the foot, specifically where the peroneus brevis tendon attaches to the fifth metatarsal base. Athletes often describe this as a painful bump on the outside of the foot.
Activity-Related Pain
You might notice:
- Pain that starts or worsens during sports
- Immediate relief when you stop the activity
- Soreness the day after competition or practice
- Difficulty with lateral cutting or pivoting movements
- Reluctance to push off on the outer foot
- Swelling on the outside of the midfoot
Impact on Performance
As the condition progresses, even walking can become uncomfortable. Many athletes report limping, difficulty with running, and inability to participate in their sport at full intensity.
How We Diagnose Iselin's Disease
Physical Examination
When you visit Central Florida Foot & Ankle Institute, our sports podiatrists will assess your foot carefully. We'll look for a prominent bony prominence on the outside of your foot and palpate the area to identify specific tenderness. We'll also evaluate your ankle stability, muscle flexibility, and walking pattern.
Imaging Studies
X-rays reveal characteristic findings:
- Prominence of the fifth metatarsal tuberosity
- Possible fragmentation or irregularity of the apophysis
- Swelling in the soft tissues around the bone
X-rays help us confirm the diagnosis and rule out other conditions like Jones fractures or peroneal tendon problems.
Ultrasound allows us to visualize the peroneus brevis tendon and assess inflammation, helping us understand the full extent of the injury.
Treatment Options for Young Athletes
Conservative Care Is the First Step
Most cases of Iselin's disease respond well to conservative treatment, allowing young athletes to return to sport without surgery.
Rest and Activity Modification
The foundation of treatment is removing the repetitive stress that caused the problem:
- Temporarily avoid the sport or activity that triggered pain
- Switch to low-impact cross-training (swimming, cycling, strength training)
- Gradually return to your sport as pain resolves
- Use "relative rest"—staying active without aggravating the injury
Ice and Anti-Inflammatory Measures
Regular icing after activities reduces inflammation and pain. Many athletes benefit from applying ice for 15-20 minutes several times daily, especially after activity.
Custom Orthotics and Taping
We often prescribe custom orthotics or recommend specific taping techniques that:
- Reduce excessive inversion (turning the sole of the foot inward)
- Offload pressure from the fifth metatarsal
- Provide arch support during activity
- Stabilize the foot to prevent repetitive stress
Immobilization
For more severe cases or when pain significantly limits activity, a walking boot for 2-4 weeks can accelerate healing by removing stress from the affected area.
Physical Therapy
A targeted physical therapy program addresses the underlying biomechanical issues:
- Calf stretching – tight calf muscles increase stress on the fifth metatarsal
- Peroneal strengthening – stronger muscles support the foot and reduce stress on the bone
- Ankle stability exercises – improving proprioception prevents repetitive ankle inversion
- Sport-specific training – gradually reintroducing the movements and demands of your sport
Return to Sport Timeline
With appropriate management, most young athletes return to full participation within 6-12 weeks. The timeline depends on:
- Severity of symptoms at presentation
- Adherence to treatment recommendations
- Underlying biomechanical issues
- The demands of your sport
We'll provide a structured return-to-sport plan that gradually increases activity to prevent re-injury.
When Surgery Becomes Necessary
Surgery is rarely needed for Iselin's disease and is only considered if conservative treatment fails after several months. When necessary, procedures include removing the inflamed apophysis or stabilizing the fifth metatarsal.
Prevention Strategies for Future Injury
Once you've recovered, these strategies help prevent Iselin's disease from returning:
- Maintain regular stretching, especially for calves and hamstrings
- Strengthen peroneal muscles with resistance exercises
- Gradually increase training intensity (no more than 10% weekly increase)
- Wear supportive athletic shoes appropriate for your sport
- Use custom orthotics if you have biomechanical risk factors
- Listen to your body and take rest days seriously
When to See a Podiatrist
If you're experiencing pain on the outside of your foot that's affecting your athletic performance, don't wait. Early treatment leads to faster recovery and better outcomes.
Schedule an appointment if you have:
- Pain on the outside of your foot that worsens with activity
- A tender bump on the outside of your midfoot
- Difficulty performing sport-specific movements
- Swelling on the outside of your foot
- Pain that persists despite rest and ice
Get Back to Your Sport
Iselin's disease doesn't have to end your athletic season. With prompt diagnosis and appropriate conservative treatment, most young athletes return to their sport stronger and more resilient than before. Our team at Central Florida Foot & Ankle Institute has extensive experience treating young athletes and understands what it takes to get you back in the game safely.
Call (407) 307-0006 or book at https://floridafai.intakeq.com/booking today. With convenient locations in Lake Mary (Waymont and MedPlex) and Downtown Orlando / SODO, we're ready to get you back to the sports you love. People also drive in from Sanford, Altamonte, and Longwood — we do not have offices in those towns.