A 28-year-old female from Delhi sustained a simple fracture of the radius and ulna 3 weeks ago. She was treated with open reduction and internal fixation (ORIF) using plates. At the 3-week follow-up, X-rays show minimal callus formation around the fracture site, and the fracture line remains clearly visible. Clinically, there is still moderate pain and swelling, and the arm cannot bear weight. Which of the following best explains the radiological findings at this stage?

Explanation

## Early Fracture Healing: Week 3 Assessment **Key Point:** At 3 weeks post-fracture, minimal callus on X-ray with a still-visible fracture line is **normal**, not pathological. This represents the transition from the inflammatory phase to early soft callus (fibrocartilaginous) phase. ### Expected Radiological Progression in Fracture Healing | Week | Phase | Radiological Appearance | Callus Type | Clinical Status | |------|-------|------------------------|-------------|----------------| | **0–2** | Inflammatory | Sharp fracture line, no callus, soft tissue swelling | None (haematoma only) | Pain, swelling, instability | | **2–4** | Early Reparative (Soft Callus) | Minimal/early callus, fracture line still visible | Fibrocartilaginous tissue | Decreasing pain, early stability | | **4–8** | Late Reparative (Hard Callus) | Bridging callus, line partially obliterated | Woven bone | Weight-bearing possible, minimal tenderness | | **8+ weeks** | Remodelling | Callus resorption, line obliterated, normal architecture | Lamellar bone | Full function | **High-Yield:** At 3 weeks, **minimal callus with visible fracture line is expected and normal**. Abundant callus formation does not appear until weeks 4–6. Do not confuse normal early healing with non-union. ### Why This Patient's Findings Are Normal at Week 3 1. **Minimal callus** → Soft callus (fibrocartilaginous) is radiolucent and does not show well on plain X-rays; hard (bony) callus appears later (weeks 4–6) 2. **Visible fracture line** → The line remains until weeks 4–8 when hard callus bridges it 3. **Moderate pain and swelling** → Expected at 3 weeks; pain decreases as callus forms 4. **No weight-bearing** → Normal; weight-bearing is introduced once hard callus forms (weeks 4–6) 5. **ORIF with plates** → Provides stability; does not accelerate callus visibility on X-ray **Clinical Pearl:** ORIF with rigid fixation may actually show **less callus** (primary bone healing) compared to conservative treatment (secondary healing with abundant callus), because the fracture surfaces are in intimate contact and the body does not need to lay down bridging callus. **Mnemonic: "Callus Comes Late"** — Soft callus (weeks 2–3) is radiolucent; hard callus (weeks 4–8) is radio-opaque and visible. At 3 weeks, expect minimal visible callus even in normal healing.