EXCLUSIVE

Lamb of God fans have no spine ... at least one doesn't thanks to a concert stampede that has now triggered a lawsuit.

William Tarantino says he went to see the metal band in November, 2012 in Connecticut. His seat wasn't great ... actually he didn't have one. William was in the standing-only section.

Bill says all was fine until the crowd went crazy, trampling him and causing traumatic fractures of the cervical spine which required surgical fusion. He says the surgery didn't fully heal him ... he has permanent spinal injuries.