Blunted metacarpals (particularly the fourth metacarpal) are a symptom of Nevoid basal cell carcinoma syndrome. The 3rd metatarsal is about 1/6 longer than the 3rd metacarpal. The metatarsals are analogous to the metacarpal bones of the hand. They each receive a contribution from a palmar metacarpal artery. He underwent surgery the following day to repair a fracture of his left fourth metacarpal. Primitively, each of the distal bones appears to have articulated with a single metacarpal. If the articular surface is wide the metacarpal may be shaved. Another common fracture, known as Boxer's fracture, is to the neck of a metacarpal. Below the knee is the cannon bone which is also known as the 3rd metacarpal. Occasionally it is used to refer to fractures of the 4th metacarpal as well. It is inserted onto the radial side of the first metacarpal. There are three tubercles on each metacarpal. Pronation-supination of the first metacarpal is especially important for the action of opposition. I occupying a little bit less than the lateral side, which articulates to metacarpal II. As in metacarpal II, the lateral connecting openings are poorly developed.