Abstract: ［Abstract］ Objective〖HTSS〗〓To compare the clinical outcomes of anterior cruciate ligament(ACL) reconstruction with doublebundle allogenic tendon, doublebundle autogenous tendon and singlebundle autogenous tendon.
〖HTH〗〖WTHZ〗Methods〖HTSS〗〓A total of 249 patients with ACL injury were randomly divided into three groups: 86 patients underwent doublebundle reconstruction with allograft(DBAL), 83 patients underwent doublebundle reconstruction with autograft(DBAU) and 80 patients underwent singlebundle reconstruction with allograft(SBAU). Postoperative evaluation tools were composed of KT1000 value, pivotshift test, the International Knee Documentation Committee Knee Uation Form(IKDC) score, Lysholm score. Patients were followed up at 3, 12 and 36 months postoperatively. An Xray examination was performed to evaluate the development of knee osteoarthritis and the expansion of the anteromedial tunnel from DB reconstruction and the single tunnel from SB reconstruction at 36 months postoperatively.
〖HTH〗〖WTHZ〗Results〖HTSS〗〓The postoperative KT1000 value showed a increasing trend in 3 groups, and there were significant differences between different groups，time points and group·time points(P＜005). The postoperative Lysholm score and IKDC score also showed an increasing trend in the 3 groups, and the difference was statistically significant at time points(P＜0.05), but there was no significant difference between groups and between group·time points(P＞005). Pivot test for 3 groups revealed that the SB group had statistically more patients with positive symptoms than both DB groups(P＜005). There were statistically significant differences in Xray classification, femoral and tibial tunnel expansion in the 3 groups at 36 months postoperatively(P＜005). 
〖HTH〗〖WTHZ〗Conclusion〖HTSS〗〓Double bundle anterior cruciate ligament reconstruction with either allogeneic tendon or autologous tendon can achieve good anterior stability and rotation stability, and the osteoarthritis development and the tunnel expansion are significantly lower than the single bundle reconstruction.

Key words: anterior cruciate ligament reconstruction, knee joint, prospective studies