Reachable Domain of Adults’ Right Leg in Sitting Posture

The reachable domain of the bending and stretching of male and female adults’ right leg in standard sitting posture was investigated. Twenty-seven healthy subjects with no movement impairing disorders were recruited. Using the VICON motion capture system, movement of the marker points pasted on the subject’s right knee, heel, and toe were recorded in four postures: (1) standard sitting position, (2) sitting with the right leg raised, (3) tiptoe position with the right leg extended backwards, and (4) heel position with the right leg extended forwards. The recorded data of all the subjects’ leg positions were statistically analyzed according to gender. The overall mean distance between the toe and heel was approximately 740 mm (male ~750 mm and female ~730 mm) when the right leg was stretched forwards and back-wards. When the right leg was raised up, the overall mean knee height was roughly 750 mm with the male average of about 800 mm and female average of about 750 mm. The overall mean knee height difference was approximately 356 mm (height difference for male was about 385 mm and height difference for female was around 306 mm) between the raised and standard sitting position. The results of this study can be used to improve the comfort of lower limb operations and operation space.