I did something to my left shoulder over a year ago.  Whatever it was would come and go for a while.  I noticed discomfort most after doing yoga--a pose called chaturanga dandasana in which you begin in plank position and bend the elbows so that your torso lowers to elbow height.  It also tends to hurt when I turn the steering wheel of my car with my left hand.  As I was reaching back to put my arm through a sleeve, I could hear it crunching.  A chiropractor suggested sprained AC joint.  What did I do and how can I fix it?
Hello, If you have pain from 1 year the first thing you should go and check it with x-ray. MRI because the problem sometimes persist, and maybe you may need surgery for it. Hope I have answered your query. Let me know if I can assist you further.