Abstract: On December 28, 2009, Employee #1 was on the seventeenth floor of a new high-rise commercial construction tapping and mudding drywall seams. He was on a Baker's scaffold without guardrails, elevated 6 ft above a concrete floor. Employee #1 was not trained and a competent person did not inspect the scaffold prior to its use. Employee #1 was 5.75 ft tall and stood on his toes to reach the top of a corner seam, measured at 13.5 ft above the floor. He stated that one of the four wheels had a pin that was shorter and smaller in diameter than the other three wheels. It came loose which caused him to lose his balance and fall. Employee #1 received a bruised lower back.