FAQ 1: My baby fell out of bed on January 1, 2006 and went to the hospital. The doctor diagnosed a supracondylar fracture of the humerus and gave him an external fixation in a plaster cast. How should I treat it? I would like to ask about this. FAQ2: A year ago my child fell while skating and was found to have a supracondylar humerus fracture with significant displacement and was given an incision and internal fixation. The most common cause of elbow inversion is supracondylar fracture of the humerus, which accounts for about 80%. Another distal humeral epiphysis separation, humeral epicondyle fracture, and medial epicondyle injury can also cause elbow inversion. Under normal circumstances, the natural elbow valgus angle of our normal elbow joint is in the normal range of 10 to 15 degrees. We call this the “carry angle”. Most scholars believe that this occurs because the distal end of the fracture is tilted medially. Studies have shown that poor post-fracture repositioning, medial bone compression insertion, separation of the lateral end of the fracture and distal internal rotation and torsion of the distal end of the fracture are the main causes of medial tilting of the distal end of the fracture. In addition, . Separation of the distal humeral epiphysis and injury to the epiphysis of the medial condyle can also lead to premature epiphyseal closure or ischemic necrosis of the medial condyle of the humerus, or extensive stripping during surgery can lead to slow growth or cessation of the medial condyle, resulting in the creation of an inversion deformity of the elbow. Prevention For fresh fractures or epiphyseal injuries, anatomical repositioning is recommended. If the displacement is not obvious, the fracture can be repositioned manually, preferably under C-arm fluoroscopy, with external fixation in a cast, and regular review and removal of the cast in about 3 weeks. If the displacement is obvious and the manual repositioning is unsuccessful, internal fixation with closed kerf pins under fluoroscopy or internal fixation with incisional repositioning is recommended. Intraoperatively, reduce the stripping of the distal fracture block, minimize the damage to the epiphysis, and pay attention to the correction of the rotational deformity at the fracture. Treatment For mild elbow valgus deformity with loss of carry angle and inversion of 10 degrees or less, surgical correction is not necessary. For severe deformities, . Elbow inversion greater than 20° is recommended for surgical correction. However, this surgery requires a more precise osteotomy angle and requires careful preoperative study and intraoperative manipulation by an orthopedic specialist to obtain good results.