Abstract: ObjectiveTo study the reliability and sensitivity of the gait analysis system based on digital video and image processing.Methods20 healthy subjects were assessed twice by the same doctor having one-week interval to investigate intraobserver reliability, they were also assessed twice separately by two doctors to investigate interobserver reliability. Gait parameters of affected limb of 20 hemiplegic patients were compared with 20 healthy subjects to investigate the sensitivity of this system.ResultsThere were high correlations in all the parameters between the two assessments. The parameters of the patients were significantly different from those of the controls.ConclusionThe system is sufficiently repeatable and sensitive in the assessment of gait.

Key words: gait, hemiplegia, reliability