Nonunion repair is a procedure to realign a bone after it breaks and heals in an offset manner. A nonunion occurs after a bone fails to heal, or the fracture shift after being set. This will cause blood flow to the area to stop and the area will become infected. Often, cartilage and scare tissue will fill the area between the split bones, causing what is called a pseudo-joint. To correct this, surgery is used to remove the formed cartilage and tissue; the bones are correctly set in place with screws and wire and are left to correctly heal.