Unexpected Crowd Surfer

Authorities are investigating

A quadriplegic man has been seriously injured at an AC/DC concert after his friend hit the joystick of his motorised wheelchair, catapulting him into the mosh pit.

Witnesses said a metal pin used by the 31-year-old man to manoeuvre objects embedded in his eye as his chair crashed more than a metre to the floor of Brisbane's Queensland Sport and Athletic Centre.

The venue is facing criticism for not placing a proper barrier in front of the wheelchair podium.

The platform had side and rear barriers, but the only barrier at the front of the podium was a strip of timber and plastic caution tape.