The metatarsal bones are bones in the middle foot located between the tarsal (ankle) bones and the base of the toes (distal phalange bones). A fracture in the fifth metatarsal (located on the outside of the foot) can occur anywhere along the bone, but most often happens on the tip of the base of the bone, closer to the ankle.
There are different types of metatarsal fractures, each one defined by the location:
• Zone 1: Small fractures of the tip of the fifth metatarsal base. The fragment of bone that is fractured pulls away from the main bone. These types of fractures are also called avulsion fractures.
• Zone 2: Larger fractures of the fifth metatarsal base closer to the shaft (the long section of the cone), also referred to as Jones fractures. Because this area of the bone has poor blood supply, nonunion (poor bone healing) occurs much more frequently in zone 2 fractures.
• Zone 3: Fractures that occur anywhere along the shaft of the metatarsal bone.