Joint swap
 

Any limb, appendage, etc. swapped with the position of another limb/appendage, including other bodies. (For example, a head could be swapped with another person's head, or a hand.)

http://www.furaffinity.net/view/2207054

Additionally; perhaps it's a duplicate of a part replacing that of the original joint/appendage.

http://www.furaffinity.net/view/590505


Process between any such events could include detachment; if you feel the need to provide actual process.



Poor examples, yes; but all the more reason for people to help find more.