Extraarticular fracture of the proximal end segment

Extraarticular fractures of a metacarpal base are classified by the AO/OTA as 77.2–5.1A, where 2–5 indicates which metacarpal is injured.

The fracture pattern may be transverse, oblique, or multifragmentary.

According to the incidence, the base of the 5th metacarpal is the most often fractured.

$Extraarticular fractures of the 5th metacarpal base$

Fractures of the 5th metacarpal base may be associated with a dislocation of the carpometacarpal (CMC) joint.

AP, lateral, and oblique views should be obtained.

$AP and oblique x-ray of an extraarticular multifragmentary metacarpal base fracture$

CT images help to evaluate the fracture pattern and compromise of the joint.

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