A 3-day-old male neonate born to a 28-year-old primigravida mother presents with bilateral foot deformity noted at birth. On examination, both feet are held in equinus position with inversion and adduction of the forefoot. The deformity cannot be passively corrected beyond midline. The mother reports no family history of similar condition. What is the most likely diagnosis, and which is the first-line management?

Explanation

## Diagnosis and Clinical Presentation **Key Point:** Congenital talipes equinovarus (CTEV) is the most common congenital foot deformity, affecting approximately 1 in 1000 live births. The classic deformity consists of four components: equinus (plantarflexion), varus (inversion), adduction of the forefoot, and internal rotation of the tibia. ## Diagnostic Features The clinical findings in this neonate are pathognomonic: - Bilateral involvement (present in ~50% of cases) - Equinus position (heel elevated) - Inversion and adduction of forefoot - **Rigid deformity** — cannot be passively corrected beyond midline (distinguishes true CTEV from positional clubfoot) - Presentation at birth ## First-Line Management: Ponseti Method **High-Yield:** The Ponseti casting method is now the gold standard first-line treatment for CTEV worldwide, with success rates of 90–95% in idiopathic cases. ### Ponseti Protocol: | Phase | Timing | Details | | --- | --- | --- | | **Initial casting** | Start within first 2 weeks of life (ideally <1 week) | Weekly cast changes for 4–6 weeks | | **Sequence of correction** | Specific order | Cavus → adductus → varus → equinus | | **Percutaneous tenotomy** | After 4–6 casts | Achilles tenotomy to correct residual equinus | | **Maintenance phase** | After tenotomy | Final cast for 3 weeks, then abduction brace (Denis Browne splint) | | **Long-term bracing** | 23 hours/day for 3 months, then night-time for 3 years | Prevents relapse | **Clinical Pearl:** Early intervention (within first 2 weeks) yields better outcomes because the foot tissues are more malleable in the neonatal period. ## Why Ponseti Over Surgery 1. **Non-invasive:** Avoids extensive soft-tissue dissection 2. **Preserves anatomy:** Maintains normal foot mechanics 3. **Lower morbidity:** Fewer complications and better long-term function 4. **Cost-effective:** Significantly cheaper than primary surgical correction 5. **Excellent outcomes:** 90–95% achieve plantigrade, pain-free feet **Mnemonic:** **PONSETI** = **P**assive **O**rthopaedic **N**on-operative **S**equential **E**quinus **T**reatment **I**nitiated early ## Differential Considerations - **Positional clubfoot:** Passively correctable to neutral or beyond; caused by intrauterine position; resolves with stretching alone - **Metatarsus adductus:** Isolated forefoot adduction; flexible; much better prognosis - **Secondary clubfoot:** Associated with neuromuscular disorders (arthrogryposis, cerebral palsy) — requires different management ## Surgical Intervention **Warning:** Surgery is reserved for: - Failure of Ponseti method (5–10% of cases) - Late presentation (>3 months of age) - Severe, rigid deformities - Recurrent deformities despite bracing Common procedures: posteromedial release, lateral column shortening, or osteotomies. [cite:Campbell's Operative Orthopaedics 13e Ch 32]