Introduction - The first major studies of the movement of human limb segments during gait were reported during the nineteenth century by Marey (1884) Muybridge (reprinted 1955). This led to the decades of work by many laboratories, mostly using cinephotography. However, the major drawback of this method of gait analysis was that the production of objective numerical data is extremely labour intensive and time consuming. It is therefore better suited to purely subjective analysis of human locomotion. A major contribution to overcoming these previous difficulties to the clinical use of gait analysis has been the introduction of the television based computer system. This paper describes the system employed at the gait laboratory, Oxford Orthopaedic Engineering Centre, University of Oxford, Nuffield Orthopaedic centre, and the methods of providing the bioengineer, clinician, orthotist, and physiotherapist with objective analysis of the physical, mechanical and orthotic parameters to be used in routine treatment of lower limb disorders.