Phalangeal fractures are more common, which can occur in the proximal, middle or distal section, section shaft fracture nearly the most common. It is usually caused by direct violence. Each hand has 14 phalanx: into the far section, and the proximal phalanx of the thumb only two phalanx.
Phalangeal fractures can be divided into the following types:
1. The proximal phalanx fractures: volar angulation projections (due interosseous muscle and lumbrical traction).
2. phalangeal neck fractures: volar projection angled, distal to the dorsal rotation of 90 degrees (referring to the central portion of the extensor stretch).
3. phalanx fracture:
(1) Bottom groups phalanx fracture, the fracture line in superficial flexor tendon proximal Reattachment point, due to superficial flexor tendon stretch, fracture distal palmar flexion, the fracture into the dorsal horn.
(2) shallow fracture of the distal tendon dead, nearly ends allegedly led to the superficial flexor tendon palmar fracture volar angulation.
4. distal phalanx fracture: more direct violence injury, such as extrusion, injured, by transverse or comminuted fracture, minimal displacement.
5. the bottom avulsion fracture of the distal phalanx: mallet finger deformity, can not take the initiative straight.