This project will examine the differences in effectiveness of fracture boots, which are "walking casts" that can be put on and taken off, and carbon fiber braces, which use a newer technology resulting in lighter and smaller braces. Gait analysis wearing both the fracture boot and the carbon fiber brace will be performed using a mat equipped with pressure sensors that will measure aspects of gait such as step length and foot position. People with hemophilia A and B who experience ankle pain from bleeds will be asked to participate. Levels of pain will be measured before, during, and after each trial. Measurements from the gait mat and levels of pain relief will be used to determine effectiveness and acceptance of each type of support.