Bending of the bone joints
Flexion and Extension
The four synovial joints are: Flexion, Extension, Abduction and Adduction.
Flexion is when you flex your arms, thighs, and other muscles. Rotation is when you rotate your joints, bending or twisting you muscles.
Specifically ellipsoidal joints are joints in the body which by their shape and ligaments allow only flexion, extension, abduction, and adduction.Rotation is impossible. The wristis an example of this type of joint.
usually the hind legs of the horse, restricting the movement and flexion of the joints.
flexion
Your question is so broad about the best answer I can give you is flexion and extension.
Rheumatoid arthritis can lead to a situation where joints can become damaged to a degree where joints can move into abnormal positions.
They are hinge joints. The elbow has only one plane of motion (flexion & extension); however, the knee is considered a "modified hinge" because it has the flexion & extension as well as a rotational (pivot) component as well.
Function of the sartorius is flexion of the hip and knee joints. It is also called as 'Tailor's muscle'.
That is flexion and extension at shoulder joint.