Typically, fractured clavicles occur as the result of a direct blow to the shoulder. Fall onto the shoulder or onto an outstretched arm can cause this.
The midshaft fracture dominance is due to two factors. Firstly this is the thinnest part of the bone, and secondly, it is the only part of the bone not reinforced by attached musculature and ligaments
On ultrasound, ligament and muscular injury can also be detected along with fracture is advantage over Xray.
AO classification of clavicular fractures :
Type A
A1 when the fracture is extra-articular. A2 when the fracture is intra-articular