A 28-year-old woman sustained a tibial fracture 8 weeks ago. Imaging shows bridging callus with early bone remodeling. Regarding the stages of fracture healing, all of the following are true EXCEPT:

## Fracture Healing at 8 Weeks — Remodeling Phase ### Timeline Context At 8 weeks post-fracture, the patient is transitioning from the **hard callus stage** into the **remodeling phase** (also called the reorganization or maturation phase). ### Stages of Fracture Healing — Quick Reference | Stage | Timeline | Primary Features | |-------|----------|------------------| | **Inflammatory** | 0–3 weeks | Hematoma, inflammation, angiogenesis, fibrocartilaginous callus begins | | **Soft Callus** | 1–4 weeks | Hyaline cartilage, fibrocartilage, early woven bone | | **Hard Callus** | 3–12 weeks | Woven bone replaces cartilage, rigid bridge forms | | **Remodeling** | 3 weeks–2+ years | Woven → lamellar bone, medullary canal restoration, callus resorption | ### Features of Remodeling Phase (8 weeks) **Key Point:** The remodeling phase is characterized by **bone maturation and architectural restoration**, NOT inflammation or angiogenesis. 1. **Woven bone → Lamellar bone conversion** - Woven bone (immature, disorganized) is replaced by mature lamellar bone (organized, strong) - This is the dominant cellular activity at 8 weeks 2. **Medullary canal restoration** - Osteoclasts resorb bone from the inner cortices - Original medullary canal architecture is gradually restored - This is a hallmark of the remodeling phase 3. **Callus resorption** - Osteoclasts resorb excess callus at fracture margins - Fracture site gradually returns to normal bone contour - Radiographically, the callus becomes less prominent 4. **Angiogenesis and inflammation — MINIMAL** - These were dominant in the **inflammatory and soft callus stages** (0–4 weeks) - By 8 weeks, acute inflammation has resolved - Neovascularization is no longer the primary process - **This is NOT a feature of the remodeling phase** **High-Yield:** The remodeling phase is about **bone maturation and architectural restoration**, not inflammation or angiogenesis. Those processes are early-stage phenomena. **Mnemonic:** **WARM** — Woven bone replacement, Architectural restoration, Resorption of callus, Medullary canal restoration (the remodeling phase).