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When a concave surface is moving the roll and the glide occur in the same direction and that when a convex surface is moving the roll and glide are opposite.
Here's an example:
If the tibia moves on the femur since it is a concave surface it is said the glide is anterior only; however, is the motion is closed chain and the femur is moving on a stationary tibia then the femur which is a convex surface glides posterior and rolls anterior on the tibia's plateau.
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