The knee is the elbow is not
The three main types of joints in the body are: ball-and-socket joints (hip and shoulder), hinge joints (knee and elbow), and pivot joints (neck).
the elbow and knee are hinge joints
synovial
Flexion ( is a typical of hinge joint ) bending the knee or elbow
Moveable ligament joints
synovial
Shoulder joints have the greatest mobility among the options listed. They have a wider range of motion compared to hip, elbow, knee, and wrist joints, allowing for movements in multiple directions such as flexion, extension, abduction, adduction, and rotation.
Joints at the knee and elbow are hinge joints, designed to move in one primary direction (flexion and extension). The structure and shape of these joints limit rotational movement to protect them from injury. Rotation at these joints is mainly performed by the muscles and bones of the forearm and leg rather than at the knee or elbow joints themselves.
synovial
The elbow and knee joints are hinge joints, allowing movement in a single plane (flexion and extension). This design enables the joints to bend and straighten, facilitating basic movements like bending and straightening the arm or leg.
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knee, ankle, hip and elbow