Aim: The purpose of this study was to evaluate the functional results of arthroscopic Bankart repair in patients with posttraumatic recurrent anterior glenohumeral instability Method: Forty one patients (6 female, 35 male; mean age 24.4; range 19 to 39 years) underwent arthroscopic Bankart repair with knotless anchors for posttraumatic recurrent anterior glenohumeral instability. The mean age that first dislocation occured was 22.3 ( range 16 to 36 years old). Involvement was on the right side in 27 patients, on the left in 14 patients, and on the dominant side in 32 patients. Pre and postoperative evaluations included detailed physical examination, assesment with the Rowe and Constant scale for shoulder functions, anteroposterior and axillary radiographs, routinely arthro-CT and arthro-MRI. Postoperatively the mean follow up was 29.8 months (range to 6 to 62 months). Result: According to Rowe score, the results were excellent in 31 patients (75.7%), good in 6 patients (14.6%), fair in 3 patients (7.3%) and poor in 1 (2.4%) patients. The mean preoperative Rowe score was 20.1, which increased postoperatively 89.1. Preoperative mean Constant scale was 64.2 and 87.6 postoperatively. The mean preoperative active external rotation was 45°, which decreased postoperatively to 40° respectively (p<0.05). Thirty seven (90.2%) patients were satisfied with the operation. The patient with the poor result developed redislocation postoperatively seventh month due to epileptic seizure. Conclusion: This study shows arthroscopic Bankart repair with knotless anchors for recurrent anterior glenohumeral instability is a useful and succesful procedure.