Copyright ©The Author(s) 2021.
World J Orthop. Jun 18, 2021; 12(6): 360-375
Published online Jun 18, 2021. doi: 10.5312/wjo.v12.i6.360
Table 1 Glossary of definitions and explanation of scientific terms
Scientific Term
Fitts LawTime to accomplish movement linearly increases with the logarithm of the index of the task difficulty
Hopf bifurcation pointA critical point where a system's stability switches and a periodic solution arises
Two-thirds Power LawExpresses the robust local relationship between the geometrical and temporal aspects of human movement
Elliptic geometryNon-Euclidean (or non-ordinary) geometry stating that there are no lines parallel to any given line, this is an example of Riemannian geometry
Affine TransformationsA transformation that preserves lines and parallelism
Equi-affine Transformationsa transformation that preserves areas, in addition to lines and parallelism
Temporal SegmentationThe central or brain action of breaking down motion sequences into different actions
Isochrony PrincipleThe duration of voluntary movement remains approximately constant across a range of movement distances; that is, movement duration is independent of movement extent
Kinematic redundancyKinematic redundancy occurs when a manipulator has more degrees of freedom than those strictly required to execute a given task. Additional active joints and interlinked segments improve both mobility and the available degrees of freedom
Inter-segmental law of coordinationA kinematic law that describes the coordination patterns among the elevation angles of the lower limb segments during locomotion (Borghese). It is reliant on accurate progressive timing of muscular contractions in adjacent segments and appendages