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. 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.Y force is mediolateral forces at the joint.Z force is therefore compression or tension at the joint.Adduction/abduction and circumduction take place at the shoulder, hip, wrist, metacarpophalangeal, and metatarsophalangeal joints. Ground Reaction Force X will look similar to Ankle Force Yįor the tibia this changes, as the axis orientation now changes: Circumduction is the movement of the limb, hand, or fingers in a circular pattern, using the sequential combination of flexion, adduction, extension, and abduction motions.Ground Reaction Force Y will look similar to Ankle Force Z.A net knee extensor moment, for example, means that the knee extensors (quadriceps) are dominant. Ground Reaction force Z will look similar to Ankle Force X The joint moment is usually calculated around a joint center.This means that the Ankle joint forces are recorded in the Foot segment axis system. muscle moment: Moment produced by the muscle (different to quantify using > motion analysis 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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