Vertical GRFs were collected with the F-scan sensors as subjects ascended and descended an 11step test staircase with a step height of 17 cm and step tread of 28.
The Figure provides sample images from the F-scan sensors from identical stance periods during stair ascent.
Since the F-scan sensors are capable of measuring only the normal forces applied to the sensor, movement of the prosthetic foot over the edge of the step may have resulted in GRFs having a substantial shear component.
Generalizability of in-shoe peak pressure measures using the F-scan system.
Demographic characteristics of 5 test subjects used to determine test-retest reliability of F-scan sensors during stair negotiation.
The pressure measurement system selected to monitor and record the interface pressure between the residual limb and prosthetic socket was a validated 6-channel F-Scan system (Tekscan), and the system software used was version 5.
Furthermore, the strength of the F-Scan system is in the number of pressure cells recorded and not the data from an individual cell.
This elastic behavior would also create signal drift of the F-Scan equipment.
The F-Scan system calculates the data from all of the individual transducer cells on each of the four arrays and displays the mean pressure value for each of the four transducer arrays for each time frame (Figure 3).