Abstract: ［Abstract］ Objective〖HTSS〗〓To compare the clinical effects of posterior cruciate ligament reconstruction using double bundle autologous tendon versus single bundle autologous tendon.
〖HTH〗〖WTHZ〗Methods〖HTSS〗〓Fiftythree cases patients who underwent posterior cruciate ligament reconstruction were randomly divided into 2 groups: 26 patients received doublebundle reconstruction(DBR), 27 patients received singlebundle reconstruction(SBR). Clinical outcomes were composed of the Lysholm score， IKDC score， KT1000 value， posterior drawer test, and patients were followed up at 3， 12 and 36monthes after operation. Xray was performed at 36 months postoperatively to evaluate the arthritic change.
〖HTH〗〖WTHZ〗Results〖HTSS〗〓The preoperative and postoperative Lysholm score and IKDC score showed an increasing trend in the 2 groups, and the difference was statistically significant between each time points(P＜005),while there was no significant difference in interaction between groups and group·time points(P＞005).The postoperative KT1000 value, which was lower than of before surgery, showed an increasing trend in 2 groups, the difference was statistically significant between groups and time points(P＜0.05), while there was no significant difference in interaction in group·time points(P＞005). Posterior drawer test revealed that there was no significant difference in 3 months after operation in 2 groups(P＞005), while there were significant differences in 12, 36 months after operation(P＜005). The difference showed statistically significant 36 months postoperatively. According to the Xray classification 36 months postoperatively, patients with grade 0 andⅠoccupied the majority in the DBR,while patients with gradeⅠandⅡoccupied the majority in the SBR, the difference between 2 groups was significantly significant（P＜005）. 
〖HTH〗〖WTHZ〗Conclusion〖HTSS〗〓The DBR and SBR of posterior cruciate ligament can obtain satisfactory results. However, the DBR is superior to the SBR in terms of stability and osteoarthritis of the knee.

Key words: knee injuries, posterior cruciate ligament, arthroscopic examination