The aim of our study is to follow up results of operatively treated active athletes after the arthroscopic reconstruction of ACL, and their return to pre-injury sport activities. The analysis included 78 athletes (66 men and 12 women, 45 active and 33 recreational). 18 patients were treated with non-anatomic single-bundle technique, 57 with anatomic single-bundle technique and 3 with double-bundle technique. We analyzed and compared parameters obtained by clinical examination and functional tests, before and 12 months after the surgery. Preoperative Lysholm score was 57.33, and postoperative 92.64 (range 43-100). Preoperative Tegner activity level was 2.43, and postoperative 7.89 (range, 1-10). Arthrometric measurements of patients before the operation were in average 8.45 mm of anterior shift of tibia in relation to femur which was corrected postoperatively to 2.18 mm in average. 64 patients returned to sport activities to the pre-injury extent, while 14 did not.