Parker et al. Journal of Medical Case Reports 2011, 5:219 http://www.jmedicalcasereports.com/content/5/1/219 Page 2 of 3 Figure 1 Pelvic radiograph view showing fracture to his left proximal femur. necrosis. Regular clinical and radiographic review is planned until two years after the injury. Discussion To ensure efficient transfer of power from the rider to the cycle during cycling, good binding of the feet to the pedal is beneficial to prevent the foot from slipping and to allow a smooth cadence. Traditionally, this involved the use of cycling shoes with rudimentary cleats strapped into a pedal with toeclips. This, however, often required the cyclist to strap their feet so tightly that they had to physically loosen the straps by hand to dis- engage the pedal making it almost useless for anyone but the most proficient cyclists. Clipless pedals were invented by Charles Hanson in 1895 but it wasn’t until the 1980s that Look (France) applied downhill ski binding technology to pedals to produce the first widely used clipless pedals. The cleat is engaged by simply pushing down and forward on the Figure 3 Radiograph of his left hip six months after surgery. Figure 2 Radiograph showing lateral view of his fractured left proximal femur. Figure 4 Radiograph of his left hip six months after surgery.