An isolated fracture of the middle and lower third of the tibia occurred with marked regularity in a large number of camel-racing jockeys. The mechanism of this fracture was analysed. It was concluded that the compression-rotation of the leg below the knee between the trunks of adjacent racing camels produced this injury, but the sparing of the fibula could not be explained. Simple measures are described such that the incidence of these and other injuries sustained by the jockeys can be markedly reduced.