An employee was unloading 12 scaffolding frames for a client. The frames were standing upright against the back window of a pickup truck and were strapped in. The pickup was on a street with a slight incline. The employee unsecured the frames, took one section off, and moved to the tailgate area of the truck to hand the frame to the client on the ground. As the employee's back was turned, the frames started falling toward him and he tried to jump out of the back of the truck, but the frames caught his left leg. The employee suffered a compound fracture in his lower left leg and was hospitalized.