Poster 170: First-Time Anterior Shoulder Instability Events in Subluxators versus Dislocators: A Comparison of Clinical Presentation, Extent of Injury, and Revision

Objectives: The objective of this study was to characterize epidemiology and postoperative outcomes in subluxators dislocators after a first-time anterior instability (FTAI) event. We hypothesized that would have milder clinical presentation, lesser degree pathology on imaging, fewer anchors placed intraoperatively comparison dislocators. Methods: Surgically managed FTAI patients from single institution between 2013-2020 were included. Exclusion criteria included multidirectional recurrent instability. Demographics surgical details retrospectively collected. Instability categorized into dislocation, which another person reduced the shoulder, or subluxation, there no documentation reducing shoulder. Labral tear location determined using clock method labral size by assigning 1 point each hour around for maximum value 12. Results: 146 (97 subluxators, 79 dislocators) available analysis. There significant differences baseline demographics. Rates bony Bankarts equivalent, but Hill-Sachs lesions reported more (88.1% vs. 52.6%, p<0.001). Table 1. Preoperative ROM strength equivalent cohorts. difference either total incidence concomitant posterior superior labrum tears. number used, although remplissage performed (18.9% 6.0%, p = 0.002). Revision rates not significantly different Conclusions: Subluxators had similar presentations with extent injury except greater frequency outcomes. Given comparable characteristics, tendency bias subluxation events as “less severe” should be reconsidered. Further investigations may necessary determine demographic anatomic predictive risk factors influence these two populations. [Table: see text]