🦴 Elbow X-ray: Normal vs Elbow Effusion (Fat Pad Sign) 🩻 This lateral elbow radiograph beautifully demonstrates the difference between a normal elbow and elbow joint effusion. 🔍 Key Radiographic Findings: ✅ Normal Elbow Anterior fat pad lies flat within the coronoid fossa Posterior fat pad is not visible (normal finding) ⚠️ Elbow Effusion Elevated anterior fat pad Visible posterior fat pad Classic “Sail Sign” appearance ⛵ ➡️ Indicates joint effusion, commonly associated with occult fractures,

Understanding fat-pad signs is crucial in trauma imaging! These images clearly demonstrate how joint effusion alters the position and visibility of the anterior and posterior fat pads on a lateral elbow X-ray. 👉 Normal Elbow: • Anterior fat pad lies parallel to the distal humerus • Posterior fat pad is not visualized 👉 Elbow Effusion: • Anterior fat pad is displaced anteriorly → “Sail Sign” ⛵ • Posterior fat pad becomes visible → ALWAYS abnormal --- 🔴 IMPORTANT NOTE FOR RADIOLOGY PROFESSIONAL