Abstract:Os acromiale is a nonunion bone mass formed by the failure of fusion of the acromial ossification center during development, with overall incidence of 7%, and mainly manifests as acromial pain and limited active movement of the shoulder. Several treatments are currently in use, although the best choice remains controversial. Due to the low incidence and the fact that some patients have no obvious symptoms, accurate physical examination, imaging screening and individualized treatment plans are very important for early recovery of motor function. This article reviews the diagnosis and treatment of os acromiale from the aspects of pathology and pathogenesis, symptoms and signs, imaging manifestations, differential diagnosis, conservative and surgical treatment, and expounds the advantages and disadvantages of various treatment methods, in order to provide reference for the individualized and precise diagnosis and treatment of os acromiale.