Torsion can occur if the ovary is unstable. For example, a cyst or ovarian mass can cause the ovary to become lopsided, making it unstable. You may also be more likely to develop ovarian torsion if you: have polycystic ovary syndrome have a long ovarian ligament, which is the fibrous stalk that connects the ovary to the uterus have had a tubal ligation are pregnantTrusted Source are undergoing hormonal treatments, usually for infertility, which can stimulate the ovary