![]() The following table lists all the lower body forces and moments with their positive and negative descriptors. For the X axis, a positive force is anterior and negative posterior.For the Y axis, a positive force for the right side is medial and negative lateral.For the Z axis, a negative force is compression and a positive force, tension.In Plug-in Gait, we use an external moment and force description. The knee extension moment arm is measured between the tibiofemoral rotation axis and the patellar ligament 2, 3. A negative force acts in the negative direction along the axis. The positive force acts in the positive direction of the axis in the distal segment on which it acts. X force is anteroposterior forces at the joint. ![]() ![]() To better remember this long list of terms, try the. Y force is mediolateral forces at the joint The seven cardinal movements of labor are: engagement, descent, flexion, internal rotation, extension, external rotation and expulsion.Z force is therefore compression or tension at the joint.Ground Reaction Force X will look similar to Ankle Force Yįor the tibia this changes, as the axis orientation now changes:.Ground Reaction Force Y will look similar to Ankle Force Z.Ground Reaction force Z will look similar to Ankle Force X The external knee adduction moment (KAM) serves as a surrogate measure of the compressive forces on the medial compartment of the knee, leading to an equal internal knee abduction moment.This means that the Ankle joint forces are recorded in the Foot segment axis system. The forces calculated by Plug-in Gait and displayed by Vicon Polygon are in the local co-ordinate frame of the distal segment in the hierarchical kinetic chain.
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