Question

Which of the following statement is incorrect about joints?

• A. Maximum rotation in hinge joint and ball-and-socket joint can be of 180${}^o$.
• B. Elbow joint is a type of hinge joint.
• C. Two or more bones combine to form a hinge joint.
• D. In ball-and-socket joint, one end of a bone is rounded and ball-like and fits into a cup-like depression of the other bone.

Answer 1

The correct option is A Maximum rotation in hinge joint and ball-and-socket joint can be of 180${}^o$.

A hinge joint is a common class of synovial joint (diarthrosis joint, surrounded by cartilage) that includes the ankle, elbow, and knee joints. Hinge joints are formed between two or more bones where the bones can only move along one axis to flex or extend. Maximum rotation in hinge joint is up to 180 degrees.

The ball and socket joint also called as the spheroidal joint is a joint in which the ball-like rounded surface of a bone moves within a cup-like depression on another bone, this allows greater freedom of movement than any other kind of joint. Example:- hip joint of mammals. Maximum rotation in ball and socket joints is 360 degrees i.e. full circle.