Objective Through in vitro experiments, biomechanical data of the transtibial pullout suture (TPS), tendon reconstruction (TR), and tendon reconstruction with suture augmentation (TRS) were collected, so as to evaluate the biomechanical effectiveness of tendon reconstruction for repairing medial meniscus posterior root tear (MMPRT). Methods Eighteen porcine knee joint models were divided into three groups, TPS, TR, and TRS. TPS group: sutures were used to fix the meniscal root. TR group: tendons were passed through an incision at the meniscal root. TRS group: tendons were passed through an incision at the meniscal root and secured at tendon-meniscus contact area with additional sutures. The sutures and tendons were pulled out through tibial tunnels and fixed at the anteromedial tibia. All groups underwent failure load tests, and ultimate failure load, displacement at failure load, load at clinical failure, stiffness, and failure modes of the samples were recorded. Results The ultimate failure load in TPS group was significantly higher than in TR group (P<0.05), but there was no significant difference between TPS group and TRS group (P>0.05). The ultimate failure load in TRS group was significantly higher than in TR group (P<0.05). The displacement at failure load in TR group and TRS group was significantly lower than that in TPS group (P<0.05), but there was no significant difference between TR group and TRS group (P>0.05). There were no significant differences in the load at clinical failure among the 3 groups (P > 0.05). The stiffness of TRS group was significantly greater than that of TPS group (P<0.05), but no significant difference was observed between TR group and TPS group, as well as between TR group and TRS group (P>0.05). All failures were caused by suture or tendon cutting through the meniscus. Conclusions The tendon reconstruction techniques is superior to the TPS in terms of failure displacement and stiffness,while the TRS further enhances the stability of the repair. This study provides an important clinical reference.