Is It Likely That Trauma Caused My Capsulation?

There is nothing in the plastic surgery literature that substantially concludes trauma to the chest leads to capsular contracture. This doesn't mean they cannot, just that there is no scientific substantiation of this phenomenon at present.

It is possible that a significant chest trauma may have cause a microtear and subacute problem leading to a capsular contracture.  Hard to say for sure.

Capsular Contracture can occur many years following silicone gel breast implants without any trauma.  Trauma can contribute if there is some bleeding.  Did your ultrasound see any fluid collection?  Although an ultrasound may show a rupture, the gold standard is the MRI.  With the newer cohesive gel implants, it may be difficult to detect small ruptures, which can contribute to capsular contracture.  Have your plastic surgeon evaluate you.  Hope this helps.