During a trauma surgery audit at a tertiary care center in Delhi, the orthopedic team reviews fracture epidemiology. Which is the most common site of fracture in the human skeleton?

Explanation

## Most Common Fracture Site in the Skeleton **Key Point:** The distal radius is the most common site of fracture in the human skeleton, accounting for approximately 15–20% of all fractures presenting to emergency departments. ### Why Distal Radius is Most Common **High-Yield:** Multiple factors contribute to the high frequency of distal radius fractures: 1. **Anatomical vulnerability:** The distal radius is a common site of impact during falls 2. **Protective reflex:** People instinctively fall on an outstretched hand (FOOSH), transferring impact to the wrist 3. **Bone quality:** In elderly patients, osteoporosis weakens the metaphyseal bone of the distal radius 4. **Bimodal age distribution:** - Young patients: high-energy trauma (sports, motor vehicle accidents) - Elderly patients: low-energy falls (osteoporotic bone) ### Epidemiology of Common Fracture Sites | Fracture Site | Frequency (% of all fractures) | Age Group | Mechanism | Common Type | | --- | --- | --- | --- | --- | | **Distal radius** | 15–20% | Bimodal (young & elderly) | FOOSH | Colles' or Smith's | | **Proximal femur** | 10–15% | Elderly | Low-energy fall | Intracapsular or extracapsular | | **Distal femur** | 5–8% | Young adults | High-energy trauma | Supracondylar or condylar | | **Proximal humerus** | 5–8% | Elderly | Fall on outstretched arm | Neck or greater tuberosity | | **Ankle (lateral malleolus)** | 8–10% | All ages | Inversion injury | Lateral malleolus | **Clinical Pearl:** The distal radius fracture is so common in elderly patients that it is sometimes called the "sentinel fracture" — its presence should prompt investigation for osteoporosis and assessment of fall risk. ### Mnemonic for Common Fracture Sites **Mnemonic:** **WRIST-HIP-ANKLE** — the three most common fracture sites globally: - **W**rist (distal radius) — most common overall - **H**ip (proximal femur) — most common in elderly, highest morbidity - **A**nkle — very common in all age groups **Warning:** Do not confuse "most common fracture site" with "most common fracture in elderly patients." While distal radius is most common overall, proximal femur fractures carry the highest morbidity and mortality in the elderly population and are the focus of more clinical attention.