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This topic will review the presentation, diagnosis, and nonoperative management of fractures of the base of the metacarpal bones (not including the thumb). A general overview of metacarpal fractures is presented separately, as are discussions of each specific type of metacarpal fracture.
Metacarpal Fractures are the most common hand injury and are divided into fractures of the head, neck, or shaft. Diagnosis is made by orthogonal radiographs the hand. Treatment is based on which metacarpal is involved, location of the fracture, and the rotation/angulation of the injury.
Overview. Each metacarpal bone has a base, shaft and head. The bases of the metacarpal bones are wide and they articulate with the bones of the distal carpal row via the carpometacarpal joints; The bases of the metacarpals 2-5 also articulate with each other.
The metacarpals form the osseous base of the complex lever system of flexor and extensor tendons of the hand. Understandably, fractures of the metacarpals disrupt this mechanism causing significant disability for the active or working patient and can come about from several different mechanisms.
The base (basis) or carpal extremity is of a cuboidal form, and broader behind than in front: it articulates with the carpal bones and with the adjoining metacarpal bones; its dorsal and volar surfaces are rough, for the attachment of ligaments.
A metacarpal fracture is a type of bone fracture (broken bone). Your metacarpals are the bones in your hand that connect your thumb and finger bones (your phalanges) to your wrist. You can feel your metacarpals by pressing on the back of your hand.
Metacarpal Base: The enlarged proximal end (the lower end on the side of the wrist) [3]; the third metacarpal has a styloid process projecting dorsally, extending behind the capitate [5]. Metacarpal Articulations
Base of Thumb metacarpal fractures can be extra-articular fractures, Bennett fractures (partial intra-articular), or Rolando fractures (complete intra-articular). Diagnosis can be made by orthogonal radiographs of the thumb.
metacarpal base fractures and dislocation of the CMC joint. metacarpal shaft and neck fractures. these are usually a result of axial loading or direct trauma (clenched fist and solid surface); torsional force may also result in this type of injury. metacarpal head injury.
Metacarpal Bones. The metacarpal bones articulate proximally with the carpals, and distally with the proximal phalanges. They are numbered, and each is associated with a digit: Metacarpal I – thumb. Metacarpal II – index finger. Metacarpal III – middle finger. Metacarpal IV – ring finger. Metacarpal V – little finger.