The posterior<unk> <unk>  is normally pressed in the olecranon fossa by the triceps tendon, and hence invisible on lateral radiograph of the elbow. When there is a fracture of the distal humerus, or other pathology involving the elbow joint, inflammation develops around the synovial membrane forcing the<unk> <unk>  out of its normal physiologic resting place. This is visible as the "posterior<unk> " and is often the only visible marker of a fracture, particularly in the pediatrics population.
Fat pad sign
Silk-glove sign
Procerus sign
String sign
Bow and arrow sign
Matchbox sign
Air crescent sign
Hilum overlay sign