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Kinect for Windows SDK Programming Guide by Abhijit Jana

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Bones – connecting joints

Bones are the visual representation between joints. They don't have any physical presence and that is why we are calling them virtual. The complete hierarchy of a skeleton is composed of a series of bones, which is the connection of all the tracked joints with the joint collection of that skeleton.

The skeleton representation is a hierarchical representation of a bone and each bone in a skeleton hierarchy has a parent joint and a child joint. This also implies that every joint can be a parent and child joint unless it is a leaf joint, such as Head Joint, Hand Joints, and so on. Parent joints are always above child joints in the hierarchy.

For example, consider the Right Leg of a skeleton which consists of Hip Center, ...

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