A 3-week-old female infant with idiopathic bilateral CTEV has been started on Ponseti casting. After the first two casts, the parents report difficulty with foot positioning and ask about the expected timeline for correction. On examination, the foot still shows significant equinus and varus deformity. What is the most appropriate next step in management?

Explanation

## Management of CTEV: The Ponseti Protocol ### Overview of Ponseti Method **Key Point:** The Ponseti technique is the gold standard first-line treatment for CTEV, with a success rate >95% when initiated early. It involves serial manipulation, casting, and bracing without primary surgical intervention in most cases. ### Phases of Ponseti Treatment ```mermaid flowchart TD A[CTEV Diagnosis]:::outcome --> B[Phase 1: Correction<br/>6-8 weeks of casting]:::action B --> C{Equinus<br/>persists?}:::decision C -->|Yes| D[Percutaneous Achilles<br/>tenotomy at 4-6 weeks]:::action C -->|No| E[Final cast applied]:::action D --> E E --> F[Phase 2: Maintenance<br/>Abduction brace 23 hrs/day<br/>for 3-4 months]:::action F --> G[Phase 3: Weaning<br/>Brace at night only<br/>until age 4-5 years]:::action G --> H[Long-term follow-up]:::outcome ``` ### Casting Protocol Details **High-Yield:** The Ponseti method follows a specific sequence: 1. **Week 1–2:** Correct adduction and supination (medial deviation of talar neck) 2. **Week 3–4:** Correct varus (inversion) 3. **Week 5–6:** Correct equinus (plantarflexion) — this is the LAST deformity corrected 4. **Week 6–8:** Maintain correction with final cast ### Role of Percutaneous Achilles Tenotomy **Clinical Pearl:** If equinus persists after 4–6 weeks of casting, a **percutaneous Achilles tenotomy** (not open surgical release) is performed under local or general anesthesia. This is a minor procedure that: - Allows complete dorsiflexion of the foot - Is performed in ~80% of CTEV cases - Does NOT compromise long-term outcomes - Is followed by one final cast for 3 weeks ### Post-Correction Maintenance Phase | Duration | Intervention | Rationale | |----------|--------------|----------| | **0–3 months** | Abduction brace 23 hrs/day | Prevent relapse | | **3 months–4 years** | Abduction brace at night + daytime shoes | Gradual weaning | | **4–5 years** | Discontinue brace; regular follow-up | Monitor for recurrence | **Tip:** Compliance with the bracing phase is crucial; non-compliance is the leading cause of relapse. ### Why Ponseti Is Superior to Early Surgery - Avoids extensive soft-tissue dissection - Preserves normal anatomy and biomechanics - Lower morbidity and complication rates - Better long-term functional outcomes - Reduced need for revision surgery ### Indications for Primary Surgical Correction - **Severe rigid CTEV** unresponsive to 8–12 weeks of casting - **Delayed presentation** (>3 months of age) - **Relapsed CTEV** after failed Ponseti treatment - **Syndromic CTEV** (e.g., arthrogryposis) — may require earlier surgery **Warning:** Primary posteromedial release is now reserved for failed Ponseti cases or late presentations; it is NOT the first-line approach.