Q:

What is a saddle joint?

A:

Quick Answer

A saddle joint is a synovial joint that allows side-to-side and back-and-forth movement with small amounts of rotation. The most obvious example in the human body is the joint at the base of the thumb.

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Full Answer

All synovial joints contain cartilage and fluid to allow for better movement. Saddle joints consist of two bones with both a concave and convex component. The bones fit perfectly within one another, similar to the legs of a rider on either side of the saddle fitting in the seat created between the front and back of the saddle. The movement allowed by a saddle joint gives humans the ability to grip items.

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