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Functional approach - Functional approach This is the best...

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Functional approach . This is the best classification as regards understanding what is going on. All above classifications are approximations and have holes in them which fit uneasily. First classify joint movement. This is always made up of:- o gliding - of one surface over another- slide o angulation - flexion, extension etc. - roll o rotation about axis of bone - spin Movement always occurs at articular surfaces, which are never planes nor spheres nor cones but always spheroids - egg shapes, either male or female i.e. convex or concave. A point moving between A and B on a surface can take the shortest great circle route a chord, or can take a longer, prettier arc. Any movement can be described by a trigone (a bendy triangle) or three arcs. The imaginary point which traces these movements is the end of the axis of rotation. In the simplest case this is the end of the long axis of the bone: for something like a femur it obviously isn't. Lets try this on a real movement, extending the knee. If we hold the tibia still and move the femur extension has three bits.
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