## Fracture Classification by Fragment Pattern **Key Point:** A comminuted fracture is defined as a fracture in which the bone is broken into three or more fragments. The term "comminuted" derives from the Latin "comminuere," meaning to break into pieces. ### Characteristics of Comminuted Fractures - **Fragment count:** ≥3 bone fragments - **Mechanism:** Usually results from high-energy trauma (motor vehicle accidents, falls from height, crush injuries) - **Stability:** Generally unstable and requires careful reduction - **Prognosis:** Longer healing time, higher risk of malunion and nonunion - **Common sites:** Femur, tibia, humerus, vertebrae ### Clinical Significance **High-Yield:** Comminuted fractures have: - Increased risk of soft tissue damage - Greater blood loss potential - Higher infection risk if open - Need for operative fixation in most cases - Prolonged rehabilitation period ### Distinction from Other Fracture Types | Fracture Type | Definition | Fragment Count | |---|---|---| | Simple (closed) | Bone breaks into 2 pieces, skin intact | 2 | | Comminuted | Bone breaks into multiple pieces | ≥3 | | Compound (open) | Bone breaks with overlying skin laceration | Variable | | Greenstick | Incomplete break, one cortex intact | Partial | **Clinical Pearl:** In pediatric patients, greenstick fractures are more common due to bone elasticity, whereas comminuted fractures are rare in children and suggest severe trauma or abuse. [cite:Rockwood and Green's Fractures in Adults Ch 1] 
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