Which type of shoulder dislocation is most common- posterior, inferior, anterior? Which x-ray views can you obtain to help you differentiate among these types?
Anterior is by far the most common dislocation type. 
|Anterior (95%)||Posterior (4%)||Inferior (1%) (aka luxatio erecta)|
|Mech of injury||Direct blow while shoulder abducted/extended/ext rotated (e.g. playing basketball)||Electrical shock, seizures, significant direct blow||Direct blow to hyperabducted arm|
|Associated findings||Hill-Sachs, Bankart’s||Humeral fracture, reverse Hill-Sachs||Axillary nerve injury, rotate cuff tears|
|Presenting shoulder position||Slightly abducted/ext rotated||Adducted/int rotated||Hyperabducted/hand above head|
Multiple x-ray views may be taken in the setting of trauma:
- Anterior-Posterior (internal / external rotation)
- Scapular “Y” / Lateral View
“Y” formed by spine/coracoid/body of scapula
- Axillary view
This is obtained by:
** Great review of shoulder anatomy here: https://www.youtube.com/watch?v=xDePRKeB4kc
1. Mallia AK, Schraga ED. Shoulder Dislocation Joint Reduction. Medscape Oct 2014.