Axis of Rotation 3
Axis of Rotation 3 : The true line about which angular motion takes place at any instant. Not necessarily identical with anatomical axis of symmetry of a limb, nor necessarily fixed. Thus, the forearm rotates about an axis that extends obliquely from the lateral side of the elbow to a point between the little finger and ring finger. The elbow joint has a fixed axis maintained by circular joint surfaces, but the knee has a moving axis as its cam-shaped surfaces articulate. Axis of rotation of tools should be aligned with true limb axis of rotation. System of rotation of tools should be aligned with true limb axis of rotation. Systems of predetermined motion times often specify such an axis incorrectly
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