Iselin Disease Fifth Metatarsal Apophysitis 2026

Condition	Age Range	Location	X-ray Finding	Mechanism	Treatment
Iselin Disease (apophysitis)	8–13 years (girls), 10–15 (boys) — during growth spurt	5th metatarsal apophysis (base)	Fragmented or irregular apophysis; normal variant = separate ossification center	Traction by peroneus brevis on open apophysis; overuse	Rest, activity modification, heel cup; 4–8 weeks; self-limiting
Zone I Avulsion Fracture (Pseudo-Jones)	Any age (adult more common)	Tuberosity — same location as Iselin	Sharp fracture line through tuberosity	Acute inversion sprain; peroneus brevis avulsion	Boot/hard shoe 4–6 weeks; occasionally surgery if displaced
Zone II Jones Fracture	Any age; athletes	Metaphyseal-diaphyseal junction (proximal, not tip)	Fracture at narrowest part of base, distal to tuberosity	Acute lateral loading; adduction	Athletes: surgery; others: NWB cast 6–8 weeks
Normal Apophyseal Ossification Center	8–12 years	Parallel to long axis of 5th metatarsal	Smooth, parallel separate ossification (no symptoms)	Normal development — not pathologic	No treatment needed

Apophysitis Condition	Bone / Location	Peak Age	Mechanism	Recovery
Iselin Disease	5th metatarsal base	10–14 years	Peroneus brevis traction on apophysis	4–8 weeks; resolves at physeal closure
Sever Disease (Calcaneal Apophysitis)	Calcaneal apophysis (posterior heel)	9–14 years	Achilles traction on apophysis; most common pediatric heel condition	4–8 weeks heel cups; resolves at physeal closure
Köhler Disease	Navicular (avascular necrosis)	3–7 years (boys)	Compressive stress on immature navicular during ossification	Short-leg cast 6–8 weeks; excellent prognosis
Freiberg Infraction	2nd (or 3rd) metatarsal head	13–18 years; female predominance	AVN of metatarsal head from repetitive stress / high heels	Metatarsal pad; NWB if severe; surgery if advanced

https://www.youtube.com/watch?v=8opvH3qxkW4

Iselin disease is inflammation of the apophysis (growth plate) on the outer side of the fifth metatarsal bone, typically affecting active children and adolescents ages 8-15. The condition causes lateral foot pain, especially with running and cutting activities. At Balance Foot & Ankle, Dr. Tom Biernacki specializes in diagnosing and managing Iselin disease to prevent complications and allow young athletes to return to sports safely.

Understanding Iselin Disease

Iselin disease results from repetitive stress on the fifth metatarsal growth plate, common in young athletes involved in soccer, basketball, dance, and other cutting sports. The condition causes lateral foot pain, swelling, and tenderness over the outside of the foot. X-rays show inflammation or separation at the growth plate. The condition resolves as the growth plate matures and fuses, typically by late teenage years.

Conservative Management

Treatment focuses on reducing stress on the fifth metatarsal during the healing phase. Dr. Biernacki recommends activity modification, supportive footwear with lateral stability, custom orthotics, and sometimes anti-inflammatory measures. Physical therapy focused on ankle stability and proprioception helps prevent re-injury.

Return to Sports

Young athletes can gradually return to sports as pain improves and the growth plate heals. Complete return to full activity typically occurs within 4-8 weeks with proper management. Dr. Biernacki works with parents and coaches to ensure safe return-to-play progression.

Long-Term Outcomes

Iselin disease has an excellent prognosis with conservative management. Once the growth plate matures and fuses, the condition completely resolves with no permanent effects. Proper rehabilitation ensures the young athlete has strong, stable feet for future sports participation.

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Frequently Asked Questions

What causes this condition?

Causes include mechanical stress, biomechanical imbalance, age-related changes, and sometimes systemic disease. Our clinical exam plus imaging identifies the specific driver.

Can it go away on its own?

Mild cases sometimes resolve with rest and supportive footwear. Persistent symptoms past 4-6 weeks rarely resolve without active treatment.

Is surgery required?

Most patients resolve with non-surgical care. Surgery is reserved for refractory cases or structural deformity.

In-Office Treatment at Balance Foot & Ankle

If home treatment isn’t providing relief for your metatarsalgia, our podiatry team at Balance Foot & Ankle can help with same-week evaluations and advanced in-office care.