Fig 1.
Moving fluoroscope developed at the Institute for Biomechanics.
Consisting of a C-arm mounted on a moving trolley, allows real time tracking of the knee throughout complete cycles of level walking, stair descent and ramp descent activities. The figure shows the set up for measurements of the left knee. For measurements of the right knee, the C-arm is rotated by 180° around its out of plane axis and the front bar, including wire sensor is reconfigured to the other side of the trolley, such that the C-arm always leads away from the subject due to safety considerations.
Fig 2.
Tracking of the trolley is achieved by positional feedback of the subject’s knee using a wire sensor and digital goniometer, thus allowing tracking of the knee joint both horizontally and vertically.
Fig 3.
Instrumented staircase and ramp.
Staircase and ramp (10° inclination) including two mobile force plates.
Table 1.
Gait Parameters and parameters of the motion of the moving fluoroscope.
Fig 4.
Movement of the knee joint centre relative to the image intensifier during level walking, stair descent and downhill walking. All trials for all 10 subjects are shown (one colour for each subject).