(A) Causes The most common cause of elbow inversion is supracondylar fracture of the humerus, which accounts for about 80%. Separation of the distal humeral epiphysis, fracture of the medial humeral epicondyle, and injury to the medial epicondyle 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 tilt 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 production of elbow inversion deformity. （For fresh fractures or epiphyseal injuries, anatomic repositioning is recommended. If the displacement is not obvious, the fracture can be repositioned manually, preferably under C-arm fluoroscopy, with external fixation in plaster, and regular review and removal of the plaster in about 3 weeks. If the displacement is obvious and the manipulation is unsuccessful, closed kyphosis internal fixation under fluoroscopy or incisional internal fixation 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. (iii) Treatment For mild elbow valgus deformity, with loss of carry angle and valgus of 10 degrees or less, surgical correction is not necessary. For severe deformities. Elbow inversion greater than 20°, surgical correction is advocated. However, this surgery requires a more precise osteotomy angle and requires careful preoperative study and intraoperative operation by an orthopedic specialist to obtain good results.