We have 4 cats, one of which used to belong to our son. When Lorr moved Solomon Grundy Too came to live with us. Not too long after joining us Too, in his adventures as a new country cat, managed to dislocate his stifle joint. For those of you who are not conversant with cat architecture, the stifle joint is the forward pointing joint near the top of the hind leg below the hip. By the time we discovered the injury it was too late for repairs so Too now has one less joint in his right hind leg. The head of the tibia/fibula is firmly joined to the center of the femur. It makes for interesting relaxed poses.