The hazards of elbow valgus, including affecting the aesthetics, paralysis and palsy of the ulnar side muscles, and affecting the rotational function of the elbow joint, are as follows: First, affecting the aesthetics: it will show deformity in appearance. First, paralysis and paralysis of ulnar side muscles: If the valgus is more powerful, it will cause narrowing of the medial elbow canal and cause ulnar nerve entrapment, which may cause ulnar side hemianesthesia and hypesthesia of the fingers, and in the case of severe compression of the ulnar nerve, degeneration of the nerve will occur, causing paralysis and paralysis of the ulnar side muscles. Third, affect the rotational function of the elbow joint: If the elbow joint is severely valgus, it may even affect the flexion function of the elbow joint, and sometimes the elbow joint cannot be fully flexed due to the degree of valgus, which may also affect the rotational function of the elbow joint. Therefore, in cases of elbow valgus, if the degree is severe, supracondylar humeral osteotomy is recommended to correct the valgus of the elbow joint.