This article: “Combined Posterior Osseous Bankart Lesion and Posterior Humeral Avulsion of the Glenohumeral Ligaments”, highlights a case study of “floating” posterior inferior glenohumeral ligament lesions. The pathoanatomy of anterior shoulder dislocations has been well documented. Until recently, little was discussed regarding posterior shoulder instability. This report offers a study on a 23-year old male who fell while snowboarding. Three years prior to the report, the young male dislocated his left shoulder, was able to relocate the shoulder on the mountain, and was managed non-operatively. The instability worsened over the years with occasional subluxation. A thorough examination was conducted, pathology discussed, and the diagnostic and treatment recommendations are highlighted in this article.Download a copy of “Combined Posterior Osseous Bankart Lesion and Posterior Humeral Avulsion of the Glenohumeral Ligaments” below.