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Metatarsus Adductus: Diagnosis, Therapy, and Medical Research
A practical overview for parents and professionals: what it is, how it’s diagnosed, and treatment options.
Quick Summary
- Metatarsus Adductus (MA) is the most common newborn foot deformity.
- Often improves on its own in mild cases (about 85%).
- Best treatment window is typically under 9 months (more flexible joints).
- Some babies with MA are at increased risk for developmental dysplasia of the hip (DDH).
What is Metatarsus Adductus?
A metatarsus is a group of bones in the middle section of the foot. Each foot has five metatarsal bones connected to the toes.
“MA” refers to a condition where the metatarsal bones are turned toward the middle of the body, causing the front of the foot to curve inward.
It may be flexible (the foot can be straightened partially by hand) or non-flexible (stiff).
Both feet are often affected.
Epidemiology
- Occurs in approximately 1 in 12 births; similar frequency in males and females.
- Bilateral in ~60% of cases.
- Higher incidence in late pregnancy, first pregnancies, twin pregnancies, and oligohydramnios.
- Associated conditions: DDH (15–20%) and torticollis.
- Persistence can be associated with hallux valgus (HV); reported MA incidence in HV patients: ~21.6%–29.5%.
Causes
It’s thought to be caused by the infant’s position inside the womb.
- Risks may include that the baby’s bottom was pointed down in the womb (breech position)
- Oligohydramnios (low amniotic fluid)
- Family history
Diagnosis
Diagnosis is typically based on a physical exam. Signs can include a high arch and a visibly curved forefoot.
X-rays are usually only needed in non-flexible cases.
Flexible MA: heel and forefoot can be aligned with gentle pressure (passive manipulation). If alignment is difficult, it’s considered non-flexible.
Metatarsus Adductus Treatment For Infants
Best window: under 9 months, when joints are more flexible and outcomes are generally better.
Option 1 — Surgery (selected cases)
Surgery may be considered in older children/adults or resistant severe cases. Outcomes vary and it’s not always a guaranteed correction.
Option 2 — Serial casting
Casting is commonly used worldwide for infants. It may take weeks and can be inconvenient for bathing and hygiene.
Option 3 — UNFO Brace
The UNFO brace is presented as an FDA & CE approved product and a modern treatment method for babies up to 9 months.
Before / After
A quick visual comparison can help parents understand what metatarsus adductus looks like and how correction may appear.
When to treat?
Early intervention (typically before 8–9 months) is often associated with better outcomes. Once the child stands and starts walking,
bracing/casting can become more difficult.
Mild, flexible cases may be observed; more rigid cases are often treated with casting/bracing.
Read the meta-analysis.
Medical Research
Avi Panski, Naum Simanovski, Vladimir Goldman, Ron Lamdan — Pediatric Orthopedics Unit, Hadassah medical center, Jerusalem
Key points
- Most cases will resolve spontaneously.
- ~11–14% may persist and require treatment.
- Optimal treatment age is commonly described as up to ~9 months.
- Options include serial casting or adjustable orthosis; rarely surgery.
UNFO treatment protocol (as presented)
- First applied for 23 hours/day.
- Weaning gradually when full correction achieved.
- 3–4 weeks: 18 hours/day.
- 3–4 weeks: 12 hours night time.
- Follow-ups: 3 weeks, when walking, and at ~1.5–2 years.
Need guidance?
If you suspect Metatarsus Adductus, consult a pediatric orthopedic specialist to assess severity and options.