Arthroscopic ACL reconstruction using patellar BTB grafts were performed 1 1 consecutive patients (Group I) and double stranded gracilis-semitendinosus grafts were performed 7 cases (Group II) from April, 1995 to February, 1997. We analysed two groups that were reviewed and evaluated with subjective and functional rating scales according to Lysholm knee scales, physical examination, KT-2000 and manual anterior laxity test. On Group I, the average follow up was 17 months(14-30mo ), and on Group II, 14 months (12-18mo). The average age at operation was 32.2 year old of the Group I & 28.1 year old of the Group II. The average Lysholm score of Group I was improved from 45.3 to 89.2 and Group II was improved from 43.1 to 87.3 at the last follow-up. According to KT-2000 at the follow up, the average side to side difference in Group I at 20lb was 1.7+1.8 mm and in Group II was 2.2+2.0mm. In this study, there were no significant differences in overall outcome between the Group I & Group II (P>0.1) but, the follow-up was too short to define the result.