How to diagnose supracondylar fracture of humerus?

Diagnosis of supracondylar fracture of humerus ① Non-displaced supracondylar fracture. Elbow is slightly swollen and painful, and the longitudinal axis is painful. X-ray film can show the fracture line, the anteversion angle of the lower end of humerus decreases or increases, and there is a depression in the front or back of cortical bone. ② Displaced supracondylar fracture. The elbow joint is swollen seriously, sometimes skin blisters appear, bones rub, and the elbow joint loses its function, but the posterior triangle relationship of the elbow joint remains normal, that is, when the elbow joint is straight, the medial and lateral epicondyle and olecranon process are in a straight line, and when the elbow joint is bent, the three points are isosceles triangles. The elbow joint of extended fracture is in a semi-flexion position, and the elbow joint protrudes backward, and the protruding proximal end can be felt in front of the elbow fossa. The elbow joint of flexion fracture is in flexion position, and the proximal end can touch the back of the elbow. X-ray film of elbow joint can make a definite diagnosis. Differential diagnosis of supracondylar fracture of humerus ① Dislocation of elbow joint. The epiphysis of the lower humerus has been closed in adults, and the supracondylar fracture of humerus and dislocation of elbow joint are easy to distinguish on X-ray film. Children sometimes have epiphyseal separation at the lower end of humerus, and its mechanism is exactly the same as that of treatment and supracondylar fracture of humerus, also known as supracondylar low fracture of humerus. /kloc-The epiphysis of humeral head and trochlear has not appeared in children under 0/8 years old. When the epiphysis of the lower humerus is separated, it is easy to be misdiagnosed as elbow dislocation. You can try reduction, and the dislocation of elbow joint is stable after reduction. When the epiphysis of the lower humerus is separated and the elbow joint is straight, the deformity is complicated. ② Epiphyseal displacement of humeral head. 1- 10 years old children, humeral epiphysis has appeared, trochlear epiphysis has not yet appeared. If epiphyseal detachment occurs at the lower end of humerus, it is easy to be misdiagnosed as epiphyseal displacement of capitulum humeri. When the epiphysis of the lower humerus is separated, the relationship between the humerus and the radial joint is normal. On the X-ray film of elbow joint, the longitudinal axis of radius passes through the center of capitulum humeri. The backward movement of humeral capitulum is the abnormal position of humeral capitulum and humeral end, and the longitudinal axis of radius does not pass through the center of humeral capitulum, but deviates to the ulnar side.