A joint help hold bones together. Luxation is the complete dislocation of a joint. Usually, when a joint dislocates, it is because of some sort of trauma occurring to the animal, genetic disorder, or older age. Sometimes it can be caused by a ligament tearing (ligaments help hold joints in place). Depending on the extent of the damage, surgery including screws and pins may be needed to repair the joint. After the surgery, your pet will need limited activity and will probably have to attend physical therapy.