IRCT20210520051351N1 IRCT 2021-06-16 Vice Chancellor for Research, Iran University of Medical Sciences Comparison of anterior cruciate ligament blood flow after reconstruction Comparison of anterior cruciate ligament perfusion after reconstruction with hamstring autograft in two methods of preservation or isolation of tibial junction based on dynamic contrast enhanced MRI findings of a randomized clinical trial study 2021-06-21 anticipated 40 Complete https://irct.ir/trial/56440 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Randomization description: Randomization method in the present study: Simple randomization is such that the form is divided among the control and intervention groups once. Randomization unit: will be personal. Visualization layers: Using randomization layers (stratified randomization) Using random options is placed in different groups and image blocks are used for balance in groups The samples are classified according to the center of the class and then in each class with the help of software to generate a random sequence Visualization tool: Random number table How to construct a random sequence is selected one by one Explanation of Concealment of Concealment Allocation: The surgical material and the person performing the analysis are not aware of the type of intervention, Blinding description: At the time of obtaining informed consent, patients are explained in an understandable language that they will undergo method 1 or 2 in one of these two hospitals. Random patients are operated on in one of two ways. There is no difference between the two methods in terms of preoperative and postoperative programs. There is no difference between the two methods in terms of pre- and postoperative interventions and complications. There is no difference between patients in terms of the appearance of extremity after surgery. There is no difference in preoperative and postoperative rehabilitation between the two groups. The surgeon is aware of the type of surgery, but visit the patient in the same way in both groups. N/A Anterior cruciate ligament tear. Intervention 1: Control group: Patients with ACL tear who undergo normal ACL reconstruction surgery with complete separation of the hamstring tendons from the distal and proximal attachment. The distal and proximal hamstring tendons are detached from the lower extremity on the same side and harvested and reconstructed arthroscopically. Intervention 2: Intervention group: Patients with ACL tear who undergo ACL reconstruction surgery in a new way with complete preservation of the hamstring tendons from the distal and separation from the proximal. The hamstring tendons are preserved distally and detached from the proximal to the lower extremity on the same side, and are harvest while the distal attachment of the tendons is attached. It is then reconstructed arthroscopically. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is After collecting the data, they are analyzed and written an article. If the journal wants the data, we will provide it to the journal with the patients' consent.