a crick in (one's) back
A sudden pain or stiffness in one's back, as from a cramp or spasm. Dad got a crick is his back while trying to move that big box.
crick in one's back
a twisted or cramped place in the back that causes pain. I can't move! I've got a crick in my back! I had a crick in my back all night and I couldn't sleep.