Broken Finger Overview
Fingers are easily injured from everyday activities, and finger injuries are some of the most common traumatic injuries seen in an emergency room. Injuries may range from simple bruises or contusions to broken bones and dislocations of the joints. Understanding the basic anatomy of the hand and fingers is useful in understanding different types of finger injuries, broken fingers, and how some treatments differ from others.
The hand is divided into three sections: wrist, palm, and fingers. There are eight bones in the wrist, which move together to allow the vast ranges of motion of the wrist. The palm, or mid-hand, is made up of the metacarpal bones. The metacarpal bones have muscular attachments and bridge the wrist to the individual fingers. These bones frequently are injured with direct trauma such as a crush from an object or most commonly from a punching injury.
The fingers are the most frequently injured part of the hand. Fingers are constructed of ligaments (strong supportive tissue connecting bone to bone), tendons (attachment tissue from muscle to bone), and three bones called phalanges. There are no muscles in the fingers. Fingers move by the pull of forearm muscles on the tendons.
The three bones in each finger are arranged in the same manner. The finger bones are named in their relation to the hand. The first bone is the proximal phalanx. The second bone is the middle phalanx. The smallest and farthest from the hand is the distal phalanx. The thumb is the shortest finger and does not have the middle phalanx.
Knuckles on the back of the hand are joints formed by the bones of the fingers. They are commonly injured or dislocated with trauma to the hand. Each joint has a specific name depending on its location and the bones involved.
The first and largest knuckle is the junction between the palmar bones and the fingers. Medically, it is the joint of the metacarpals and phalanges or the metacarpophalangeal joint (MCP). This joint commonly is injured in closed fist activities, and a fracture of this area is commonly known as a boxer's fracture.
The next knuckle out toward the fingertip is the joint closest to the hand and between the finger bones. It is termed the proximal inter-phalangeal joint (PIP). This joint may be dislocated in sporting events when a ball or object directly strikes the finger.
The farthest joint of the finger is the distal inter-phalangeal joint (DIP). Injuries to this joint usually involve a fracture (a break) or tendon tearing (avulsion) injury.
Medically Reviewed by a Doctor on 10/31/2014
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