Partial articular fracture of the proximal end segment

Shearing fractures of the proximal phalangeal base are partial articular fractures and classified according to AO/OTA as 78.2–5.1.1B, where 2–5 indicates which finger is injured.

A partial articular fracture may be associated with a metacarpophalangeal (MCP) joint dislocation.

$Partial articular shearing fracture of the phalangeal proximal end segment$

The mechanism of this fracture is a combination of compression and shearing forces. The patient usually presents with angular deviation and malrotation.

$The combination of compression and shearing forces resulting in a shear fracture$

X-ray

AP and oblique x-ray of a partial articular fracture of the 2nd proximal phalangeal base (AO/OTA 78.2.1.1B) associated with a partial articular fracture of the distal end segment (the head) of the metacarpal (AO/OTA 77.2.3B).

$AP and oblique x-ray of a partial articular fracture of the 2nd proximal phalangeal base and the metacarpal head$