MODEL RELEASED. Locomotion research. Researcher using a computer to model the movement of a man fitted with reflective infrared markers. Infrared cameras use these to record the relative motion of his legs and joints. The computer then models the way a human walks. This is used to help assess foot and joint disorders, and also treatments such as joint implants and rehabilitation from injury. Photographed at the Movement Analysis Laboratory at the Rizzoli Institute, Bologna, Italy.