Question

supposed the ball - and - socket joint of the hip was replaced with a pivot joint in which the femur is directly planted into the acetabulum. what movement(s) is/are now the only one(s) possible? multiple choice abduction and adduction circumduction rotation flexion and extension

Explanation:

A pivot joint allows rotation around a single axis. Ball - and - socket joints allow a wide range of movements (abduction, adduction, circumduction, flexion, extension, rotation). But when replaced with a pivot joint, only rotation (around the axis of the pivot) would be possible. Abduction and adduction (movement away from and towards the mid - line), circumduction (circular movement), flexion and extension (bending and straightening) are not typical of a pivot joint.

Answer:

Rotation