This surgery fixes an ovary that has twisted. When such twisting happens, it's called ovarian torsion. A fallopian tube may also sometimes twist with the ovary.
You have two ovaries. There is one on each side of your uterus. The ovaries store your eggs (ova). They also make the hormone estrogen. The fallopian tubes link the ovaries to the uterus. They carry the ova to the uterus.
Torsion can happen to a healthy ovary. But it most often occurs when an ovary has a cyst or tumor on it. The mass can cause the ovary to twist. Blood flow to the ovary may then be cut off, so it's very important that surgery be done as quickly as possible to restore blood flow. Lack of blood flow for some time can kill the ovary. Your surgeon will look at the ovary during surgery to find out if the ovary tissue has died because of the lack of blood flow.