The preservation of the residual structure of the torn anterior cruciate ligament (ACL) stump during ACL reconstruction continues to engender controversy. Studies have shown that the residual ACL fibers within the stump may contribute to restore the proprioceptive function after ACL reconstruction. Proper selection of cases with sufficient residual ACL stump structure and surgical technique is crucial to regain the mechanical and proprioceptive role of the ACL and to prevent the development of cyclops lesion. This paper will focus on the surgical techniques in ACL reconstruction with the goal of preserving the residual ACL stump as a graft envelope.