The clubfoot casting process is the active treatment phase of the Ponseti method, where weekly plaster casts gradually reposition your baby's foot from its clubfoot position into a corrected alignment. For most parents, this is the most intensive period of treatment — weekly hospital visits, plaster casts on a tiny baby, and the emotional weight of watching your newborn go through a medical procedure. This week-by-week guide explains exactly what happens at each stage, what to expect, and how to manage the practicalities at home.
Before Casting Begins
Ponseti casting ideally starts within the first 1-2 weeks of life, when the foot's soft tissues are most pliable. At the first appointment, the Ponseti practitioner will:
- Examine both feet thoroughly
- Score the deformity using the Pirani classification (0-6 scale)
- Explain the treatment plan, including the expected number of casts, the likely need for an Achilles tenotomy, and the boots-and-bar phase
- Apply the first cast during this visit at most centres
Parents should wear comfortable clothing to the appointment and bring a spare nappy, feeds, and a blanket. The appointment typically lasts 30-60 minutes. A pushchair or car seat that accommodates the cast is helpful for getting home.
How Each Casting Session Works
Every weekly visit follows a similar pattern:
- Cast removal: The previous week's cast is soaked off using warm water or removed with an oscillating plaster saw. The saw is noisy but safe — it vibrates rather than spins, and cannot cut skin. Babies often dislike the noise more than the sensation.
- Assessment: The practitioner examines the foot to assess the correction achieved by the previous cast. The Pirani score is updated.
- Gentle manipulation: The practitioner holds the foot and gently stretches it toward the corrected position. This is done slowly and carefully — the Ponseti method relies on gradual tissue stretching, not forced correction. The manipulation typically lasts 1-2 minutes.
- Cast application: A new plaster of Paris cast is applied, holding the foot in the newly achieved position. The cast is moulded carefully to maintain the correction. Most centres use above-knee casts (extending from the toes to above the knee) because the knee flexion provides rotational control of the foot.
- Drying: The cast takes 10-15 minutes to set sufficiently for the baby to be moved. Full hardening takes several hours.
Week-by-Week Correction Sequence
The Ponseti method corrects the clubfoot deformity in a specific sequence, addressing each component in order:
Cast 1: Correcting the Cavus
The first cast addresses the cavus (high arch) by supinating the forefoot — lifting the front of the foot to align with the hindfoot. This flattens the arch and aligns the forefoot with the hindfoot, creating a platform for subsequent corrections. The practitioner lifts the first metatarsal while holding the midfoot.
After the first cast, parents often notice that the deep crease across the sole has softened.
Casts 2-3: Correcting the Adductus and Beginning Varus Correction
With the cavus corrected, subsequent casts abduct the foot (turn it outward) while counter-pressure is applied over the talar head (a bony prominence on the outer side of the foot). This simultaneously corrects:
- The adductus (inward curving of the forefoot)
- The varus (inward turning of the heel)
The foot gradually moves from its C-shape to a straighter alignment. Parents typically see the most dramatic visual improvement during these casts.
Casts 3-5: Continued Abduction and Varus Correction
Each successive cast achieves a few more degrees of abduction. The foot progressively rotates outward. The heel, which started pointing inward, begins to move toward a neutral or slightly everted position.
The practitioner continues to apply counter-pressure over the lateral talar head during manipulation — this is the fulcrum point that allows the navicular and calcaneus to rotate around the talus.
Casts 5-7: Maximising Abduction
The final casts before the tenotomy achieve maximum abduction of the foot — typically 60-70 degrees of outward rotation from the midline. At this point, the forefoot adductus and hindfoot varus should be fully corrected.
However, the equinus component (the foot pointing downward due to the tight Achilles tendon) usually remains. If ankle dorsiflexion is less than 10-15 degrees above neutral, an Achilles tenotomy is needed — this applies to approximately 80-90% of cases.
The Tenotomy and Final Cast
When the practitioner determines that maximum correction has been achieved through casting but the equinus persists, the Achilles tenotomy is scheduled. In many centres, this is performed at the next weekly appointment rather than as a separate procedure.
After the tenotomy, a final cast is applied in maximum dorsiflexion and abduction. This cast remains in place for 3 weeks (rather than the standard 1 week) to allow the Achilles tendon to regenerate in its lengthened position.
When this final cast is removed, the foot should be in a fully corrected position and the transition to boots and bar begins.
Cast Care at Home
Keeping the Cast Dry
Plaster of Paris casts must be kept dry. If the cast gets wet, it softens and loses its corrective properties. Practical tips:
- Sponge-bathe the baby rather than giving full baths during the casting phase
- Use a waterproof nappy cover or an extra nappy layer to prevent urine soaking up into the cast
- Tuck a disposable nappy liner into the top of the cast to catch any moisture
- If the cast becomes damp, try drying it with a hairdryer on a cool setting
Skin Monitoring
Check the visible skin around the cast edges regularly:
- Look for redness, swelling, or discharge that might indicate skin irritation or infection
- Smell the cast — a foul odour may indicate a problem underneath
- Check the baby's toes for colour (should be pink), warmth, and movement
- Ensure the toes aren't swollen — mild puffiness can occur but significant swelling needs urgent review
Clothing
An above-knee cast requires adjustments to clothing:
- Babygrows may not fit over the cast — use tops with separate trousers/leggings on the non-casted leg
- Large-sized sleepsuits may work if cut along the leg seam
- Socks can be placed over the cast toes to keep them warm
Feeding and Comfort
Most babies feed normally in a cast. If your baby seems uncomfortable, try different holding positions. Some parents find that propping the casted leg on a pillow during feeds helps. A feeding pillow can provide useful support.
Sleep
Babies can sleep in their casts following normal safe sleep guidelines — on their back, in a cot with a firm mattress. The cast adds some weight, so the baby may move less in their sleep initially. Most babies adjust within a day or two. For more sleep strategies, see our sleep guide.
Car Seats
An above-knee cast may affect how the baby fits in their car seat. Test the car seat before you leave the hospital to ensure a safe fit. You may need to adjust the harness or temporarily use a different seat.
When to Seek Urgent Help
Contact the clubfoot clinic or your hospital's emergency department if:
- The baby's toes turn blue, white, or very swollen
- The baby is excessively irritable and inconsolable (beyond normal casting adjustment)
- There is a foul smell from the cast
- The cast slips or cracks
- You notice discharge, bleeding, or redness around the cast edges
- The baby develops a fever (temperature above 38°C)
Variations in the Standard Protocol
Bilateral Clubfoot
When both feet are affected, both are cast simultaneously. This means two casts at each visit. The treatment sequence and duration are the same for each foot, though the severity and response may differ between sides.
Atypical or Complex Clubfoot
Some feet present with atypical features — a short, stubby foot with deep creases, a hyperextended first metatarsal, or extreme stiffness. These may require a modified casting technique and sometimes additional casts. The treating practitioner will adapt the approach as needed. Feet with associated conditions may also respond differently to standard casting.
Older Babies
While the Ponseti method is most effective when started in the first two weeks, it can be used for babies presenting later — up to 6-12 months of age in many cases. Older babies may require more casts and a longer casting phase, but good correction is still achievable.
Emotional Aspects of the Casting Phase
The casting period is emotionally intense for many parents. Common feelings include:
- Distress at seeing your newborn in plaster
- Guilt (irrational but common) about the child's condition
- Anxiety about whether the treatment is working
- Frustration with the practical limitations of managing a baby in a cast
- Exhaustion from weekly hospital visits
These feelings are entirely normal. Connecting with other clubfoot families through support groups can make an enormous difference. Most parents report that the casting phase, while challenging, passes more quickly than expected and that seeing their baby's foot straighten week by week provides profound reassurance.
Frequently Asked Questions
Q: Does Ponseti casting hurt my baby?
A: The manipulation and cast application may cause brief discomfort — most babies cry during the process — but it is not painful in the way surgery would be. The manipulation uses gentle, sustained pressure rather than force. Most babies settle within minutes of the cast being applied and are feeding happily before leaving the clinic.
Q: Can I breastfeed during the casting appointment?
A: Yes, many practitioners actively encourage breastfeeding or bottle-feeding during cast application, as it comforts the baby and serves as a distraction. Discuss this with your clinic team beforehand.
Q: How many casts will my baby need?
A: Most babies need 4-7 casts, applied weekly. The exact number depends on the severity of the deformity and how quickly the foot responds. Mild clubfoot may correct in 4 casts; severe cases may need 7 or occasionally more. Your practitioner will give you a more specific estimate after the first 1-2 casts.
Q: What if we miss a weekly appointment?
A: Try to avoid missing appointments, as consistent weekly casting produces the best results. If you must miss a week, contact the clinic to reschedule as soon as possible. A one-week delay is unlikely to affect the outcome significantly, but repeated delays can slow correction. The foot may stiffen slightly in the existing cast position, potentially requiring extra casts.
Q: Is plaster of Paris or fibreglass used for Ponseti casts?
A: Traditional Ponseti casts use plaster of Paris (gypsum) because it moulds better than fibreglass and allows the practitioner to shape the cast precisely around the foot's contours. Some centres use semi-rigid fibreglass for the final layers of the cast, but the inner moulding layer is almost always plaster. The cast material should not be a concern for parents — both are safe and effective when applied by a trained practitioner.