Hinge joint best examples of ginglymoid joints are the Interphalangeal joints of the hand and those of the foot and the joint between the humerus and ulna. The knee joints and ankle joints are less typical, as they allow a slight degree of rotation or of side-to-side movement in certain positions of the limb. The knee is the largest hinge joint in the human body. Hinge and pivot joints are both types of synovial joint. A hinge joint can be considered a modified sellar/saddle joint, with reduced movement. Other objects that work like hinged joints are door hinges, closet doors, and dog
Bell's hinge-back tortoise Bell's hinge-back tortoise Bell's hinge-back tortoise ("Kinixys belliana") is a species of African tortoise, from the family Testudinidae. It has the hinge that characterizes all tortoises in the genus "Kinixys". There are several subspecies (some of which may actually be separate species; see below) and the Bell's hinge-back tortoise is subject to wide variation throughout its extensive range. Both the specific name, "belliana", and the common name are in honor of English zoologist Thomas Bell. Bell's hinge-back tortoise is a medium-sized light brown tortoise. They can grow up to 22 cm. On the back of its shell, the tortoise has