Can a life altering injury be linked to PTSD? Can your life being altered make this a viable reason?

Having a life changing experience "being hurt" and never returning to the same physical emotional social status be linked in with a ptsd DIAGNOSIS?after READING MANY BOOKS ON THE SUBJECT it seems like they go hand in hand.I am sure many arguments from both sides can be entered into the mix.Also many symptoms of PTSD are like PCS and other brain related problems.Is a violent act,head injury resulting in a lifelong change any kind of a basis for suffering from PTSD.

It seems like many factors are involved and who can best say what is the criteria for a diagnosis to my question.My feeling is people are all different,this said we all react to things differently.A huge problem for 1 person is a small bump in the road for another.The differences make us all unique in that we all could in fact suffer from life changing problems at different levels.It seems to have a gray area and what can be included in a basis for the diagnosis of PTSD.