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Objetives In the treatment of anterior shoulder instability there are have been described many surgical techniques, all of them with advantages and disadvantages. Our goal is to study the half term results on patients that underwent open Bristow-Latarjet surgery considering the preoperative ISIS value. Method This is a retrospective study of 33 patients that underwent open Bristow-Latarjet surgery in our center between 2005 and 2012. Average age of 33 (21-68) years and follow up of 6 (2-9) years. Results were taken by Rowe and Constant scores, DASH questionnaire and we also recorded a subjective assessment of the result by each patient. Results No recurrence was reported. No reoperations. Mean Rowe score was 74.6 (15-100) points and mean Constant score was 70 (32-98) points. In the disability questionnaire (DASH), the mean value was 22.9 (0-73) points. Seventy-nine percent of patients were satisfied with surgery result. The migration of a screw occurred in one patient Conclusions We believe that Bristow-Latarjet technique is a reliable technique, with few complications and with an low rate of recurrence in treatment of chronic shoulder instability as reported in literature. We believe, therefore, that it should be used as primary surgery in some cases and the preoperative ISIS is an excellent and simple guide to select correctly the surgical technique for each patient.