Reconstruction of the allograft ligament is unlikely to be absorbed. Reconstructed allograft ligaments are less likely to be resorbed as long as blood flow is restored. Surgical grafts for knee ligament reconstruction currently include autologous tendons, allogeneic tendons, and artificial ligaments, each with its own advantages and disadvantages. 1. Autologous tendon: lower price, need to take out the tendon of small role of the autologous body, have extra incision, not worried about immune rejection and spread of disease. 2. Allograft tendon: moderate price, no damage to the tendon, less incidence of immune rejection. 3. Artificial ligaments: more expensive, no additional incision, no need for re-modeling process, and earlier weight bearing. The probability of absorption after reconstruction of allograft ligaments is not high, but the activities should be carried out in accordance with medical advice to avoid re-injury of the reconstructed grafts.