Tehran University of Medical Sciences Journal of Orthopedic and Spine Trauma 2538-2330 7 1 2021 04 20 24 6 Mohamad Hasan Sharafi Department of Orthopedic and Trauma Surgery, Shariati Hospital, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran Hamid Rabie Department of Orthopedic and Trauma Surgery, Shariati Hospital, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran Leila Oryadi Zanjani Shariati Hospital, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran 2020 11 13 2021 04 15 Background: Although there are several surgical options for the treatment of acromioclavicular joint (ACJ) dislocation, there is no definite gold standard. Anatomical reconstruction techniques are becoming more popular due to the new understandings of the anatomy and biomechanics of the ACJ.   Case Report: A 40-year-old male with left ACJ dislocation (Type 3 Rockwood classification) underwent anatomical reconstruction with a semitendinosus tendon graft harvested from the left knee.   Conclusion: Anatomical reconstruction of ACJ by autograft is an effective treatment option. https://jost.tums.ac.ir/index.php/jost/article/view/239 https://jost.tums.ac.ir/index.php/jost/article/download/239/213