New Kids on the Block and Backstreet Boys perform at the Scotiabank Saddledome during the Calgary Stampede in Calgary July 13, 2011. (JIM WELLS/QMI AGENCY FILE PHOTO)

Backstreet Boys and New Kids on the Block are in the clear after a judge dismissed a $5 million US lawsuit filed against the bands by an injured stagehand.

William Wesley Styron was setting up for the pop groups' joint concert at the FedExForum in Memphis, Tenn., in June last year when he allegedly stumbled and plunged 3.9 metres to the ground.

In his lawsuit, Styron claimed he fractured his skull and sustained a "traumatic brain injury" in the fall but the bands insisted the accident was his own fault for failing to look where he was going.

Maryland District Court Judge J. Frederick Motz ruled in favour of the musicians last month, stating responsibility for the accident lies with the company that hired Styron, Crew One Productions, Inc.

Judge Motz dismissed the lawsuit against the bands.