Abstract

One of the causes of injury in football is the development of excessive torque on the knee due to a combination of foot fixation and body rotation. Footwear fixation presents designers with a performance di lemma because of the need to develop sufficient translational friction and at the same time to minimise the development of rotational traction. While much research has been conducted on running and court shoes, little is known of the behaviour of field shoes in general and the traction at the shoe-surface interface in particular. The laws of friction between dry, solid, homogenous surfaces do not fully explain the mechanism of traction when one of the contacting surfaces is not smooth or solid but is granular and/or is wet, or when the footwear has cleats.

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