A 35-year-old man presents to the orthopedic clinic 6 weeks after sustaining a closed fracture of the mid-shaft femur, treated conservatively with skeletal traction. Clinical examination shows minimal tenderness at the fracture site and the patient reports pain-free weight-bearing. X-rays show early callus formation bridging the fracture ends with some bridging callus visible on two cortices. What is the most appropriate next step in management?

Explanation

## Clinical Context The patient is at 6 weeks post-fracture with clinical and radiological evidence of early callus formation and bridging on two cortices. This indicates progression into the **early callus (soft callus) phase** of fracture healing, which typically begins around 2–3 weeks and extends to 8–12 weeks depending on fracture location and patient factors. ## Key Point: **Transition to functional bracing or early mobilization is the correct next step.** Once early callus bridging is evident on X-ray (typically after 4–6 weeks in femoral fractures), the fracture has sufficient mechanical stability to allow progressive weight-bearing and mobilization. Continued immobilization beyond this point risks stiffness, muscle atrophy, and delayed union. ## Stages of Fracture Healing | Stage | Timeline | Radiological Features | Management Implication | |-------|----------|----------------------|------------------------| | **Inflammatory (Haematoma)** | 0–3 days | No callus visible | Immobilization, pain control | | **Soft Callus (Early Callus)** | 2–12 weeks | Bridging callus on 2–3 cortices | Functional bracing, early mobilization | | **Hard Callus (Bridging Callus)** | 3–6 months | Bridging on all cortices | Progressive weight-bearing | | **Remodelling** | 6 months–2 years | Callus resorption, cortical restoration | Full activity as tolerated | ## Clinical Pearl: **Early mobilization within the soft callus phase promotes:** - Improved callus maturation and mineralization - Prevention of stiffness and contractures - Faster return to function - Better long-term outcomes compared to prolonged immobilization ## High-Yield: The presence of bridging callus on **two or more cortices** is the clinical trigger to transition from strict immobilization to functional bracing. This typically occurs at 4–8 weeks depending on fracture type and patient age. ## Mnemonic: **CAST OFF** — Callus Appears, Soft callus Transition, Then Orthoses Freed (functional bracing begins).