What have I done to my shoulder/arm

[jaycee]

a year ago I hurt myself simply taking off a coat. I experienced a severe pain in my right shoulder/arm which lasted a few minutes. I then found I couldn't move my arm behind my back (ie in the motion you use to clasp your hands together behind your back. I still cannot do this, nor can I move my arm backwards to take off my coat without experiencing a sharp pain throughout my shoulder and arm. Also I have the same pain if I suddenly move my arm out to the side (eg to reach for someone falling on my right hand side). I experience no pain in moving my arm forward or upwards from the front. There is some pain if I move it straight out, and I experience an intense shock of pain in my shoulder and down my arm if I, say, bang on a door with an outstretched palm. The symptoms have not changed in a year, I don't notice any pain while walking or carrying a backpack or shoulder bag.

What could possibly have happened?

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