A 23 y/o young man fall by direct impact on left shoulder. Here is his radiographys.

1. What is the injury ?

     Acromioclavicular joint seperation.

2. What is the mechanism for this type of injury ?

    Fall with direct impact on the superior aspect of acromion.

3. What type of injury in this patient ?

    Type V.

4. What is the treatment goal for an EP ?

    Type I~II is conservative.

    Type III optional/controversial

    Type IV~VI is surgical intervention.

Classification of AC joint seperation:

     Type I appear normal

     Type II 0~50% displacement at the AC joint but no increase in the coracoclavicular interval

     Type III clavicle displaced superiorly 50% to 100% when compared to normal side.

     Type IV distal clavicle displaced posteriorly into or through the trapezius

     Type V  displaced > 100~300%

     Type VI distal clavicel displace inferiorly

Here were the post-op view of this patient