The hip joint is best classified as a ball-and-socket joint because it allows for multi-axial movement, including flexion, extension, abduction, adduction, and rotation. The spherical head of the femur fits into the deep acetabulum of the pelvis, providing both stability and a wide range of motion. This anatomical design is critical during surgical procedures like hip replacement, where accurate alignment of the ball and socket is essential to restore normal function and prevent dislocation. The deep socket and strong ligamentous support make the hip joint more stable than other synovial joints.

Reference: Gray’s Anatomy, Standring S., 42nd Edition.