Ground reactions forces

Ground reaction forces were measured using two 6 degrees of freedom force plates (AMTI, Watertown, MA). The coordinate system is a right-handed system.

Raw data:

VARIABLE DESCRIPTION UNITS SAMPLE RATE
Fx,y,z 1/2 Ground reaction forces, forceplate 1 and 2 N 960Hz
Mx,y,z 1/2 Moments relative to the original forceplate coordinate system, forceplate 1 and 2 Nmm 960Hz

For the calculation of the center of pressure the following offsets were used. The true origins of the coordinate systems are located below the top surfaces, with a distance (zo).

Processed data

(see Comprehensive Data Sample (http://orthoload.com/comprehensive-data-sample/)):

VARIABLE DESCRIPTION UNITS SAMPLE RATE
Fgrx,y,zi Ground reaction forces, ipsilateral legN90-110 Hz
COP_x,yiCenter of pressure, relative to forceplate center, ipsilateral legmm90-110 Hz
Tz_oTorque around z-axis at CoP, ipsilateral legNm90-110 Hz

grf2f.eof data:

(Downsampled Ground Reaction Forces)

 

VARIABLE DESCRIPTION UNITS SAMPLE RATE
Fgrxi,yi,zi Ground reaction forces, ipsilateral leg N 90-110 Hz
Fgrxc,yc,zc Ground reaction forces, contralateral leg N 90-110 Hz
F Resultant joint contact force (implant) N 90-110 Hz