Dekker TJ, Peebles LA, Bernhardson AS, et al. - In this study, the existing variables and their ability were examined to predict recurrence of shoulder instability as it relates to the instability severity index score (ISIS), as well as evaluate any other pertinent imaging and patient history variables that may impact the risk of recurrent anterior instability following arthroscopic Bankart repair. Researchers distinguished all consecutive individuals with recurrent anterior shoulder instability and had arthroscopic instability repair. The analysis included a total of 217 consecutive individuals (209 male [96.5%], 8 female [3.5%]) and were all treated with a primary arthroscopic shoulder stabilization during a 3.5-year period (2007-2011), with a mean follow-up time of 42 months (range, 26-58). This study’s findings demonstrated that at a mean follow-up of 42 months, was an 11.5% failure rate following arthroscopic Bankart stabilization surgery. There was no association between treatment outcome and the ISIS measure, given a mean score of 3.4 for the overall cohort with little difference identified in those that failed. Nevertheless, they diagnosed several important parameters previously unidentified including, glenoid bone loss > 14.5%, Hill-Sachs volume >1.3cm ³, and duration of instability symptoms (> 3 months). The results considered that ISIS may need to be redesigned in order to incorporate variables that more accurately portray the actual risk of failure following arthroscopic stabilization, including quantification of both glenoid and humeral head bone loss.