The main reasons for missed diagnosis of shoulder dislocation are: (1) multiple injuries, other injuries covering up the shoulder trauma, such as Case 1, an open trauma to the left elbow, where the doctor only paid attention to the condition of the elbow and did not conduct a detailed physical examination, resulting in missed diagnosis. (2) Suffering from certain diseases and unwilling to report to the doctor, the patient has a history of epilepsy, had functional impairment in the right shoulder after the seizure, and was unwilling to undergo follow-up X-rays after reduction, resulting in missed diagnosis. Patients with mental illness and elderly people may miss diagnosis due to unclear perception and sensation, mistaking them for soft tissue damage [1]. At the same time, patients with financial difficulties are reluctant to go to the hospital for examination and treatment, which is also one of the reasons for missed diagnosis.