Contralateral and siblings' knees are at higher risk of ACL tear for patients with a positive history of ACL tear. - Mardani-Kivi, Mohsen; Mobarakeh, Mahmoud Karimi; Keyhani, Sohrab; Ebrahim-zadeh, Mohammad-Hossein; Azari, Zoleikha (Knee Surgery, Sports Traumatology, Arthroscopy, 2020)