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This joint looks like a horse’s back with a saddle resting on it. One bone is rounded (convex) and fits neatly into the other bone, which is concave. The saddle joint moves up and down and side to side, but it doesn’t rotate. Your wrist and your thumb have this kind of joint. See Figure 1-4 for an example of a saddle joint.

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FIGURE 1-4: A saddle joint. The saddle joint moves up and down and side to side.